Carrier code 126-high heat cycle active

Carrier Infinity Thermostats are good quality and reliable units that effectively manage humidity levels, airflow, ventilation, and indoor air quality among other things. But these systems can also experience issues from time to time. Other users may have challenges with their setup and operation.

Feb 24, 2023 · 126 - High Heat Cycle Active, Carrier furnace, about 13 years old. Last service was Dec 22, last filter change was yesterday (23 Feb 23). Have not seen this before, have contacted our normal HVAC servicing company and await a (possible) visit. Carrier infinity system installation instructions (16 pages) Thermostat Carrier 33CS Installation, Service, And Troubleshooting Instructions. Temp system unitary controller thermostat (32 pages) Thermostat Carrier edge Owner's Manual. Performance programmable (64 pages) Thermostat Carrier TC-PHP Owner's Manual.Automatic unloaded start. High-efficiency motor. Designed to allow smooth, unrestricted refrigerant flow. Two-piece shaft seal assembly eliminates seal leakage for maximum reliability. Energy efficient part load operation with automatic capacity control to 35% of full-design load. Positive pressure oil lubrication extends life cycle. 75 HP. 460V.Code 2-1. Gas heating lockout - the furnace shuts off fuel and power to prevent unsafe operation. Check the gas valve. If you don't hear a clicking noise, once you turn the unit on, the valve might have to be replaced. There may be a problem with the control board. Code 2-2.A D2 PWM duty cycle of 70% gives a motor duty cycle of 70%. Typically, only one of the two disable pins is used, but the default is for both disable pins to be active. PWM / D1: HIGH: Disable input: when D1 is high, OUT1 and OUT2 are set to high impedance. A D1 PWM duty cycle of 70% gives a motor duty cycle of 30%.switch to high-heat, as long as the thermostat continues to call for heat. Subsequent selection is based on stored history of the thermostat cycle times. The wall thermostat "calls for heat", closing the R to W circuit. The furnace control performs a self-check, verifies the low-heat and high-heat pressure switch contacts LPS and HPS are open. a.Check that the thermostat is set correctly to "heat.". If you do not have heat, the thermostat could be set on "off" or "cool.". If this is the case, change it to "heat". Check the temperature setting, sometimes referred to as the "set point.". If your furnace is not running, try adjusting the temperature on the thermostat ...Jan 29, 2011 · I have a zoned Carrier Infinity system. I pulled the faceplate off of the 2nd t-stat to mount it on the wall and now I get a code 44 and code 41. Is there a way to do a reset to see if it really a pro … read more

1 Flash. The ambient temperature sensor is out of range (open or shorted). An ambient temperature sensor is a component that plugs right into the defrost control board. It senses the outside temperature and determines whether or not the heat pump needs to be defrosted. You should initiate a defrost cycle manually after every hour of …The furnace is operating in high heat. If you are a lucky owner of a two-stage furnace, then you should know that your unit has two heat settings – low-heat and high-heat. The majority of the time, the furnace will be operating in low-heat mode, but when it becomes very cold outside, the unit can switch to the high-heat setting.Carrier furnace fault code 41 might indicate a malfunction with your blower motor, gas valve, or connecting belt. If you have a dead blower, a broken sensor in the gas valve, or a damaged connecting belt, you might need to replace it immediately. Plenty of fault codes can assist you in identifying the specific failing component and addressing ...The unit has a Code of “E3” on the inside Temperature Display, which from the Troubleshooting section of the manual, say's “Outdoor Temp sensor reading out of range”. ... I have 2 Carrier Heat Pump Systems with 2 inside Carrier Control Units. ... went bad (5 years after install), and now the second Carrier unit has lost its Outside Temp ...Hello! The Carrier high efficiency gas furnace which I installed for a customer two years ago has a short cycling problem. Please find the below model and description of the problem: Model #: 59SC2A120S241120 Normal Procedure The furnace starts with the normal procedure: thermostat calls heat, inducer fan turns on, igniter turns …Flash Code on Outdoor Board: 51 for 38TDB, YDB 598B, 698B models and 32 for 24ANA, 25HNA 187A, 180A, 286A, 288A. Fault description: Low Pressure Switch trip. Potential cause and action: Switch is monitored at all. Flash Code on Outdoor Board: 52 for 38TDB, YDB 598B, 698B models and 31 for 24ANA, 25HNA 187A, 180A, 286A, 288A.

Your new Carrier heat pump system is what we call a ”split system.” It ... •During the heating cycle, your heat pump delivers a constant flow of air at around 95°F (35°C)to …gas furnace and the electric heat pump as outside temperatures change to maintain greater efficiency and comfort than with any traditional single-source heating system. The heat pump also delivers high-efficiency cooling in the summer. Power Heatt Igniter — Carrier’s unique SiN igniter is not only physically robust is also electrically robust.Sensor MalfunctionF4 outdoor mid-coil Temp. sensor malfunctionF5 outdoor discharge air Temp. sensorF7 cooling oil return cycleE1 System High Pressure ProtectionE2 Indoor Freeze ProtectionE3 System Low Pressure ProtectionE4 Compressor Discharge High Temp.Code 14 – Ignition Lockout Code 21 - Gas Heating Lockout Code 22 - Abnormal Flame Proving Signal Code 23 – Pressure Switch Did Not Open Code 24 – Secondary Voltage Fuse Open Code 33 – Limit Circuit Fault AND high heat only is active Code 45 – Control Circuitry Lockout Code 41 – Blower Motor Fault ((-A) models only)During the cold weather months, heat pumps extract heat from the air outside — no matter how cold it is — and use refrigerant within the system to transport that heat into your home, ultimately raising the temperature. If you don’t feel like your home is getting warm when your heat pump is turned on, it might not be heating properly.

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We would like to show you a description here but the site won’t allow us.An air conditioner or heat pump using R-410A refrigerant may operate at pressures exceeding 600 psi. A typical Carrier HVACR unit incorporates a high-pressure safety switch that operates at 610 psi and a low pressure (loss of refrigerant detection safety device) that operates at about 20 psi.Such A Fault Code Can Appear If The System Is Overheating. Web system fault 126 high heat cycle active. The update changed blower speeds at the comfort levels causing an o. Cycles per hour screen • if. Web Biblical Meaning Of 126 Angel Number. Web your trusted heating & cooling certified technicians since 1999.This Wi-Fi ® enabled Evolution™ Connex™ system control, with occupancy sensing ability, knows when you're gone and automatically sets the system for maximum savings. When you're home, its intuitive interface puts comfort control at your fingertips through a user-friendly touch-screen design. Capable of managing a complete home comfort ... We would like to show you a description here but the site won’t allow us.Today’s and tonight’s Clarington, OH weather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.com

1.1.1. Displaying Codes on the Gauge Cluster (Non-VID equipped vehicles) To display codes on vehicles not equipped with a VID: 1. Set the parking brake. 2. Turn the key switch to the ACCESSORY position to view only previously active codes. Turn the key switch to the IGNITION position to view both active and previously active codes. 3.The thermostat has found an unknown device on the system. •The room thermostat when not in configuration mode has detected an unknown device. •Typically the thermostat will …CODE: 1-2. RESULT: BLOWER ON AFTER POWER UP (115VAC or 24VAC) FIX: Blower runs for 90 seconds, if unit is powered up during a call for heat (R-W closed) CODE: 1-3. RESULT: LIMIT OR FLAME ROLL-OUT SWITCH LOCKOUT. FIX: Control will auto reset after 3 hours. Reset switch or replace fuse link. CODE: 1-4. Your Bryant furnace will show code 13 if there is a limit circuit lockout. This either means that the high limit switch has been tripped 10 times in high-heat or 3 times in low-heat. You would have to wait for the system to reset itself in 3 hours. The most common causes for such an issue include: A faulty limit switch; Insufficient airflowAre you excited to start enjoying your favorite shows on My5 TV? Activating your device is a simple process that can be completed in just a few minutes. In this article, we will guide you through the steps of activating My5 TV by entering t...Oct 16, 2021 · Code 1-3: Indicates that a limit flame switch problem that normally auto-resets after 3 hours. Code 1-4: Represents an ignition problem. However, the furnace will auto-reset after some hours. Code 2-1: This is a sign of gas heating lockout. You need to check if the gas valve wiring is correct. high−density insulation. For neat, high quality installations, the unit exterior features sweat refrigerant connections for simple leak free performance, and multiple electrical entry for both high and low voltage service. Assembled at the factory compliant with low leak requirements of less than 2% cabinet leakage rate at 0.5 inches W.C. and ...I get the 126-High Heat Cycle Active warning when it is cold outside but not cold enough to reach HP lockout. The system is six months old and under warranty. The installer's tech …

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Flash Code on Outdoor Board: 51 for 38TDB, YDB 598B, 698B models and 32 for 24ANA, 25HNA 187A, 180A, 286A, 288A. Fault description: Low Pressure Switch trip. Potential cause and action: Switch is monitored at all. Flash Code on Outdoor Board: 52 for 38TDB, YDB 598B, 698B models and 31 for 24ANA, 25HNA 187A, 180A, 286A, 288A. Press the red HEAT button to set the heating humidity. Adjust the desired heating humidity using either (+/-) button. Press the blue COOL button to set the cooling humidity. Adjust the desired cooling humidity using either (+/-) button. Press BASIC or close the door to exit.Bryant offers a wide range of financing options for your HVAC system. Searchheating and cooling prices in the rebate center.CODE: 1-2. RESULT: BLOWER ON AFTER POWER UP (115VAC or 24VAC) FIX: Blower runs for 90 seconds, if unit is powered up during a call for heat (R-W closed) CODE: 1-3. RESULT: LIMIT OR FLAME ROLL-OUT SWITCH LOCKOUT. FIX: Control will auto reset after 3 hours. Reset switch or replace fuse link. CODE: 1-4.on a PCB or heat sink is illustrated in Figure 2. The PIC consists of a chip mounted on a chip carrier or lead frame, and held by solder or bonding adhesive. The lead frame consists of a high-conductivity material such as copper, and can have a Table 1 The Most Important SMD-Packages Package Heat Sink / Pin P-DSO-8-1 – P-DSO-14-4 Pin 3-5; 10 ...Code 1-3: Indicates that a limit flame switch problem that normally auto-resets after 3 hours. Code 1-4: Represents an ignition problem. However, the furnace will auto-reset after some hours. Code 2-1: This is a sign of gas heating lockout. You need to check if the gas valve wiring is correct.Jan 29, 2011 · I have a zoned Carrier Infinity system. I pulled the faceplate off of the 2nd t-stat to mount it on the wall and now I get a code 44 and code 41. Is there a way to do a reset to see if it really a pro … read more 5 flames losses during one heat cycle. Ignition Re-Cycle - The control will re-cycle up to 5 flame losses (4 re-cycles) within a single call for heat before going to lockout. The LED will flash “7” during this lockout. A Yellow LED labeled “FLAME” is provided to indicate flame status Flame Status - When flame is sensed, the flame LED is ... I have a brand new Carrier 59MN7B Fully Modulating Furnace (60,000 BTU for a 1900 sqft living space - Single Zone) which is constantly tripping Error…Thermo King - Byron Center, MI. 955 76th St. SW Byron Center, MI 49315. Toll Free: 1-800-968-9378 Phone: (616) 878-4900

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Carrier: SYSTXCCUIZ01, SYSTXCCUIZ01-A, SYSTXCCUID01, SYSTXCCUID01-A Bryant: SYSTXBBUIZ01, SYSTXBBUIZ01-A , SYSTXBBUID01, SYSTXBBUID01-A There are two ways to determine the software version: enter the Service menus with a 10 second push of the Advance button, or cycle power to the User Interface.the furnace control will select intermediate-heat for 45 seconds, minimum-heat for 19 minutes and then switch to maximum-heat, as long as the thermostat continues to call for heat. The furnace control CPU then uses this information to calculate the modulating rate the furnace will operate at on the next heating cycle. If the calculated Wi-Fi ® enabled smart thermostats give you control over your home comfort. Using iOS ® or Android ® devices, you can adjust temperature, humidity, airflow, and ventilation from anywhere in the world. Add features like SmartSensors, voice control with Alexa ®, streaming music, or even hands-free calling to further enhance your smart home ... Code 14 – Ignition Lockout Code 21 - Gas Heating Lockout Code 22 - Abnormal Flame Proving Signal Code 23 – Pressure Switch Did Not Open Code 24 – Secondary Voltage Fuse Open Code 33 – Limit Circuit Fault AND high heat only is active Code 45 – Control Circuitry Lockout Code 41 – Blower Motor Fault ((-A) models only)Deoxyribonucleic acid (/ d iː ˈ ɒ k s ɪ ˌ r aɪ b oʊ nj uː ˌ k l iː ɪ k,-ˌ k l eɪ-/ ⓘ; DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.DNA and ribonucleic acid (RNA) …8.5.2 Krebs Cycle. The Krebs cycle involves a series of enzyme catalyzed reactions that reduce the acetyl portion of acetyl coenzyme A in the mitochondrial matrix, as shown in Figure 8.25. The Krebs cycle continuously recycles, reusing the substrates and enzymes with an overall reaction given by. Figure 8.25.Check for proper switch operation Check for continuity in the high limit switch after furnace has cooled down (15 minutes). If the high limit switch is still open, then the switch is bad. If flame rollout switch is tripped, look for back drafts, blocked flue and check heat exchanger to determine the cause of flame rollout.source heat pump safety and operation. The Complete C control features a light-emitting diode (LED) to indicate high pressure, low pressure, low voltage, high voltage, air/water freeze protection, condensate overflow and control status. The Complete C control is compatible with most heat pump thermostats, but is not compatible with Heat/Cool ...Wi-Fi ® enabled smart thermostats give you control over your home comfort. Using iOS ® or Android ® devices, you can adjust temperature, humidity, airflow, and ventilation from anywhere in the world. Add features like SmartSensors, voice control with Alexa ®, streaming music, or even hands-free calling to further enhance your smart home ... Activating your Fire TV Stick is a simple process that only takes a few minutes. With an activation code, you can access all the content available on the device and start streaming your favorite shows and movies. Here’s how to activate your...Dec 14, 2021 · 🔥Error code 126 on Carrier Infinity thermostat is caused by having excessive heat during low and intermediate heat mode, therefore system jumps into high heat when the furnace starts... Question Carrier Infinity "System Malfunction". My HVAC unit is having issues. In services menu it says (all these within past few days) 82-Thermal lockout in high stage 4 hours - 4 events ACTIVE 72- Thermal cutout in high stage - 7 events 31- High pressure switch open - 8 events 84- High pressure lockout 4 hours - 1 event. ….

CODE: 4-4. You may deal with a faulty blower calibration, and the code shows that the measured blower speed is under 250 or higher than 1300 RPM. The furnace will switch to low or high heat mode if it’s possible. The problem develops together with fault no.41, so you also have to look at the motor.Aug 21, 2023 · During this, the gas valve operates at a lower heat level. Transition from Low Heat to High Heat: If you’ve requested high heat and the high-heat pressure switch doesn’t close within 30 seconds, the 2-stage furnace control displays Status Code 31. If the switch doesn’t close within 2 minutes after requesting high heat, the furnace control ... I get the same "System Fault" on a new Infinity Hybrid System (59MN7B Furnance w/ 25VNA4 HP). I get the 126-High Heat Cycle Active warning when it is cold outside but not cold enough to reach HP lockout. The system is six months old and under warranty. The installer's tech offered no insight after a two-hour house call.An air handler unit, also known as fan coil unit, is an essential component of your home heating and cooling system. It is responsible for circulating conditioned air throughout the home. An air handler typically consists of a blower fan, an evaporator coil, and a filter and is usually installed indoors, either in a basement, attic, or closet.As technological advances permeate our homes, we have been introduced to smart HVAC (Heating, Ventilation, and Air Conditioning) systems that bring improved comfort, efficiency, and even enhanced health benefits. However, like any other technological device,I am still looking for the 58STA furnace but many of the control faults are the same. The 22 is abnormal flame sense Which usually means a flame was sensed when there shouldnt be one. The flame sensor may simply need to be cleaned. One one side of the burners is the ignitor (usually right side) in front of the left burner is a single rod ...It is shown in a range like 50-80° or 45-75°. Those first two numbers are the lowest recommended temperature rise; the highest allowed temperature rise through the furnace is usually a 30° difference. When possible, we want to get the rise toward the center of that range. So if our return air temperature is 70 degrees, the lowest supply air ...I am still looking for the 58STA furnace but many of the control faults are the same. The 22 is abnormal flame sense Which usually means a flame was sensed when there shouldnt be one. The flame sensor may simply need to be cleaned. One one side of the burners is the ignitor (usually right side) in front of the left burner is a single rod ...3. Check the condensate pump, if your furnace has one. If the reservoir is full, then the pump may need to be replaced or the wiring to it tightened. If the wiring is tight but the pump won’t come on, it probably needs to be replaced. 4. If the furnace has a …times in a row in LOW FIRE during a call for heat. Control will auto-reset in 3 hr. NOTE: After 2 low-fire limit trips, the control is locked into high-heat mode; however, a third low-heat cycle can be forced due to excessive restriction in air delivery system. My system would try to ignite three times then lock out for three hours. Carrier code 126-high heat cycle active, Because of the size of Great Danes, they typically don’t experience their first heat until they are around two years old, and they have a heat cycle every 12 to 18 months. Smaller dogs can have two heat cycles per year., 126 - High Heat Cycle Active, Carrier furnace, about 13 years old. Last service was Dec 22, last filter change was yesterday (23 Feb 23). Have not seen this before, have contacted our normal HVAC serv … read more, A Carrier Access Code, or CAC, is a seven-digit code that allows callers to reach a specific carrier from any telephone. These codes are sometimes used to dial around an interexchange carrier and obtain better rates., The high wall fan coil unit can be set up and operated from the remote control (provided). If the remote is misplaced, the system can be operated from the “Auto” setting on the unit. Operating Modes: The high wall fan coil unit has five operating modes: Fan only Auto Heating (heat pump models only) Cooling Dehumidification (DRY) Fan Only, During this, the gas valve operates at a lower heat level. Transition from Low Heat to High Heat: If you’ve requested high heat and the high-heat pressure switch doesn’t close within 30 seconds, the 2-stage furnace control displays Status Code 31. If the switch doesn’t close within 2 minutes after requesting high heat, the furnace control ..., Deoxyribonucleic acid (/ d iː ˈ ɒ k s ɪ ˌ r aɪ b oʊ nj uː ˌ k l iː ɪ k,-ˌ k l eɪ-/ ⓘ; DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.DNA and ribonucleic acid (RNA) …, The furnace will overheat in low mod then ramp to high stage. The fault is just notifying you that it's running on high stage. …, We would like to show you a description here but the site won’t allow us., NOTE: The initial heat mode after 115-v or 24-v power interrup-tion will be LOW HEAT. Low heat remains energized for 16 minutes before high heat is initiated, providing thermostat is still calling for heat. After the initial cycle, the microprocessor evaluates the length of low- and high-heat operating times and calculates optimum length, The furnace will overheat in low mod then ramp to high stage. The fault is just notifying you that it's running on high stage. …, This is a listing of all current truck, trailer, CR, DAS and DSR alarm codes. On multi-temp units, the zone will be identified. Please record all alarms that occur to assist technician in resolving issue. Alarm codes with parenthesis (XX) may exist with alarm code 84 and may clear automatically., One of the largest benefits of a VRF system is that the indoor units utilize coils which can heat or cool the zones. Heat pump system configurations can either completely cool or completely heat all the zones it serves. In a Heat Recovery system each individual zone can either heat or cool as needed. When simultaneously cooling and heating in a ..., Carrier Infinity fault codes are used to diagnose and troubleshoot issues with Carrier Infinity series HVAC systems. These fault codes provide valuable information about the system’s malfunctions and can help …, On the call for heat once the inducer motor ensures safe operation then the circuit board sends a signal to spark igniter. It stops sparking after lightening the burners…. Hot Surface Igniter (HSI) Most high-efficiency furnaces have HSI. On the call for heat once the inducer motor ensures safe operation then the circuit board sends a signal ..., Jul 1, 2018 · Carrier Infinity central AC system installed in 2006. Has worked flawlessly until last night. Model# 38TDB036-301. Yearly filter changes (MERV13); both sets of coils clear. I'm getting constant thermal lockouts on both high and low stages. Power cycled unit via circuit breakers several times. This allows the unit to start after a 7 minute delay ... , Download Owner's Manual. The Bryant® Housewise™ Wi-Fi® Thermostat provides you and your family with comfort around the house and around the clock. You're just a touch away from having ultimate control over the way your heating and cooling system uses energy and gaining real money savings. The app is available for iOS or Android devices., Pro Tech™ Posts: 264 Logged #1 November 16, 2021, 07:08:09 AM It has something to do with your furnace overheating. Either too many of your supply and return grills are blocked. Maybe you need to have duct cleaning really really bad. Or, and this you can't really fix yourself, your gas valve is overfiring and the manifold pressure needs adjustment., Message on thermostat display: System Fault 126-high heat cycle active. ... My infinity system is showing malfunction code 81 low thermal lockout. ... The high stage contacter on my Carrier HNA25A HEAT PUMP stays open during startup after being off …, On the call for heat once the inducer motor ensures safe operation then the circuit board sends a signal to spark igniter. It stops sparking after lightening the burners…. Hot Surface Igniter (HSI) Most high-efficiency furnaces have HSI. On the call for heat once the inducer motor ensures safe operation then the circuit board sends a signal ..., Carrier’s Warranty Coverage. Whether you have a furnace in Carrier’s Infinity® Series, Performance™ Series, or their Comfort™ Series, all models come standard with the same comprehensive warranty. This includes a limited lifetime warranty on the heat exchanger as well as a limited 10-year warranty on parts., System Fault 126 High Heat Cycle Active . Passive harmonic filters provide an inexpensive way to mitigate the harmonics created by vfds ..., Remove the screws retaining the front grille to the front panel. Remove the front grille. Then remove the screws retaining the panel, lift it upward to loosen the clasp on the right side, rotate it to the left and then remove the front panel. , As a nurse, indoor air quality is a high priority so the variable speed motor running continuous is so good. 24/7 air cleaning. Greg did a great job on install, attention to detail so appreciated. Already notice such an improved comfort and heat. Thank you Twintech! You come as advertised. I will recommend to anyone in need of heating or cooling! , Code 2-1. Gas heating lockout - the furnace shuts off fuel and power to prevent unsafe operation. Check the gas valve. If you don't hear a clicking noise, once you turn the unit on, the valve might have to be replaced. There may be a problem with the control board. Code 2-2., A Carrier Access Code, or CAC, is a seven-digit code that allows callers to reach a specific carrier from any telephone. These codes are sometimes used to dial around an interexchange carrier and obtain better rates., The Greenspeed Intelligence heat pump and air conditioner features the latest variable speed technology. The heart of the system is the Samsung high side rotary or scroll variable speed compressor powered through the use of the Samsung variable frequency drive (VFD) control. By combining the Primary Control Module (PCM), an ECM outdoor fan, , Code • Heat pump will not be used to service a heating demand. 19 •Minor Thermostat The outside temperature is higher than the level where the furnace or electric heat is programmed to work. This is a notification only alert code. The system will only use the heat pump to warm your home • • Outdoor temperature is above the low balance ..., Oct 16, 2021 · Code 1-3: Indicates that a limit flame switch problem that normally auto-resets after 3 hours. Code 1-4: Represents an ignition problem. However, the furnace will auto-reset after some hours. Code 2-1: This is a sign of gas heating lockout. You need to check if the gas valve wiring is correct. , During the cold weather months, heat pumps extract heat from the air outside — no matter how cold it is — and use refrigerant within the system to transport that heat into your home, ultimately raising the temperature. If you don’t feel like your home is getting warm when your heat pump is turned on, it might not be heating properly., Boards with date codes of 9506 or later will lock into high-heat mode after 2 low-fire limit trips and cannot be forced into a third low-heat cycle. Therefore, units with these boards can only lockout if the limit switch trips 10 times in a row in a high fire during a call for heat. How to fix carrier furnace code 13: Reset the flame roll-out ..., Get professional furnace and air conditioning installation, maintenance, and 24-hour repair services with SNAP Heating & Air Conditioning. Our licensed and experienced technicians are available around the clock to provide prompt and reliable service to keep your home comfortable all year long., View and Download Carrier X4 7300 operation & service manual online. ... 3.14 VIEW ACTIVE ALARMS ALARM START/STOP ACTIVE ALARMS (2 of 5) CONTINUOUS A13 High Discharge Pressure DEFROST A97 Check SV2 Circuit A86 Check UL2 Circuit MENU CLEAR BACK ALARMS 1. ... 00029 CHECK HEAT CYCLE • ACTIVATION: ..., Check that the thermostat is set correctly to “heat.”. If you do not have heat, the thermostat could be set on “off” or “cool.”. If this is the case, change it to “heat”. Check the temperature setting, sometimes referred to as the “set point.”. If your furnace is not running, try adjusting the temperature on the thermostat ...