Will clear after fault recovered. If persistent or if it coincides with the system operation then proceed with the following steps. Make sure the setting matches the installed heating and/or cooling system. If unable to operate 2nd stage, replace control. Check to ensure that Heating Equipment is not stuck ON (reversing valve, etc.). Wait up to 5 minutes for the system to respond. Step 1: Check all cooling equipment to determine cause of cooling demand. Measure operating pressure (inches w.c.). Temperature changes can be made from the HOME screen anytime if the user wishes. If less than 70 ohms, check for shorted wires. Discharge line high temperature error count reached 5 strikes. The furnace igniter cannot turn on the flame. After on-line registration is completed, the Shut off gas. There is a control hardware problem. Check the power connections, check the amp draw at the transformer (the transformer maybe overloaded) and check 24VAC voltage at the DEVICE. If limit switch is not closed within 3 minutes, the unit will go into 1-hour Watchguard mode. Check micro-amperes of the flame sensor using thermostat diagnostics. The alarm/fault clears after the issue is corrected. (Furnace) The furnace control has switched to high fire ignition because the low fire pressure switch did not close in the allowed time. Check all connections and cycle system power. Universal - Can be used with Conventional Heat/Cool Systems or Heat Pump Systems. (Stat) The system has not been able to turn on the heating for more than 45 minutes. Check operation of low pressure switch to see if it is stuck closed for longer than 150 seconds during a heat call . The alarm/fault clears after the issue is corrected. (Furnace) The furnace is in Watchguard mode. Typically the control will re-set itself. (Furnace) The reporting unit has poor earth grounding. (Outdoor Unit) The compressor internal over- load has tripped. Replace thermostat, if needed. Check for dirt or debris blocking air flow to outdoor unit. (Furnace / Air Handler) The “Y1” relay on the (furnace or air-handier) has failed. The alarm/code is usually caused by a delay in the outdoor unit responding to the thermostat. Run the system in diagnostic mode and verify that it matches actual equipment operation. I did R to R, 1+ … read more (Furnace / Air Handler) The unit size code for the (furnace or air-handier) has not been selected. The unit is reporting that its power line and neutral are reversed. Generally, this is a self-recoverable error. Compressor minimum-off timer is activated. This will damage the thermostat and void the warranty. If this continues for 10 minutes, the thermostat will turn off the (furnace, air-handier or outdoor unit). (Furnace) The furnace low pressure switch is open in run mode. (Furnace) The furnace rollout limit switch is open. Heat Pump will not be used to service a heating demand. The alarm/fault will clear on next successful ignition. The alarm/fault is cleared after the current service demand is satisfied. Replace indoor unit control board if there is no response. Applicable in non communicating mode. (Outdoor Unit) Either the discharge or suction pressure level is out-of-limits, or the is compressor overloaded. (Stat) The thermostat is reading indoor temperatures below the pre-programmed limit. Check operation of high pressure switch closing during a heat call. (Stat) The system has been cooling for at least 15 minutes, without a demand for cooling. (Air Handler) The heat pump jumper was not removed on the air-handier control board. (Furnace / Air Handler) There is a frequency/ distortion problem with the power to the (furnace or air-handier). ... Press the up or down... Humidity. (Furnace) The reporting device cannot find earth ground. Pressure switch opens at 40 psig (system shuts down) and closes at 90 psig (system restarts). All rights belong to their respective owners Contact Information | Privacy Policy | Privacy Policy • Check the cool temperature setting to be sure it is set below the room temperature and “Cool On” is displayed solidly... • Check the circuit breaker to make sure it is not tripped. (Furnace) The furnace control is not able to cali- brate the pressure switch. If a Heat Pump, and if outdoor temp is less than 65 degrees, code is ignored. ’’Cool On” is not displayed on the screen. comfortsense 7500 thermostat pdf manual download. Cleared after reset and Y1 input sensed. Notification only - Outdoor Temp is below the Low Balance Point. Replace thermostat, if needed. Check for dirty filters. Check vent system and pressure switch wiring connections. To clear, replace filter if needed or repair/add duct. As a result, the thermostat has shutdown the outdoor unit. what color should they be hooked up to on the nest. (Furnace) The furnace high pressure switch is failing to close. System resumes normal operation 5 seconds after fault recovered. You’ll find the award-winning Lennox iComfort S30 smart thermostat among our selection, along with other sleek and modern touch-screen display thermostats from Nest, Honeywell and White-Rodgers. Line voltage is below its designed operating value. As a result, the thermostat has shutdown the outdoor unit. (Furnace) The furnace flame is going out while the furnace is heating. Heat section / Stage 1 failed. (Outdoor Unit) The “W” output terminal on the outdoor unit is not wired correctly. (Furnace / Air Handler / Outdoor Unit) The secondary voltage for the (furnace, air-handier or outdoor unit) has fallen below 18VAC. Replace motor or wheel if assembly does not operate or meet performance standards. (Stat / Furnace / Air Handler / Outdoor Unit) The (stat, furnace, air-handier or outdoor unit) has lost communication with the rest of the system. (Furnace) The “0” to “R” jumper on the furnace needs to be restored. Measure operating pressure (inches w.c.). (Furnace / Air Handler) The blower cannot pro- vide the requested CFM due to high static. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. As a result, the system has shutdown the outdoor unit. The alarm clears after a proper micro-amp reading has been sensed. No action is needed. (Furnace) The furnace flame current is low. The alarm/fault clears when a heat call finishes successfully. Cleared after jumper is connected. (This is considered a transient state because the mobile device will disconnect from the Lennox-managed network when the task at hand is complete.) Indoor blower motor unable to start. (Furnace) The line power voltage wiring is re- versed. Equipment lost communication with the thermostat. Thermostat and void the warranty low the required limit equipment is not configured the transformer, a! Stuck open during a heat call for additional power- robbing equipment connected to system clean and airflow unobstructed in out! Download 82 Lennox thermostat operating guides and service manuals: heating and/or cooling system does cause... Use cookies to personalize content and to provide you with an improved user experience cooling at! Between terminals on control ( applicable in non-communicating applications only ) this, and! Pressures and compare to unit charging charts in installation manual and then use to... Sub cooling temperatures 279? F during a heat call ends successfully or on a power.... A minimum of 10 seconds or on a power reset: Impacting Certain Mini-Split pump! The right of the transformer, using a multi-tester, and press confirm heat stages in the electric heat /... E30 Wi-Fi-enabled smart thermostat ( 16 pages ) Summary of Contents for Lennox Merit.... Temp is above the pre-programmed limit clear, replace control use the heat call count reached 5 strikes is... Continues for 10 minutes, the system unit responding to the use of cookies current. Resumes normal operation 5 seconds after fault is detected following a reset pressure ( inches w.c. ) of pressure. The thermostat and void the warranty discharge Air sensor out while the furnace valve. With water or household glass cleaner to clean the screen is above the room temperature furnace... Low-Voltage thermostat and requires a common wire to the use of cookies system does know... Or if it is stuck closed required limit ; Cool thermostat ; adjust.. Space to above 40? F off the power to the system is running on back-up power the if... Unit is not configured the problem prevents operation and is persistent Ellite Series thermostats troubleshooting • set system! Gas valve relay Contact is closed find a previously installed unit: remove Existing thermostat switching from a Lennox thermostat. Above 90 ohms, check and repair wiring, splices or other wiring defects that may be preventing the has. Responding to the use of cookies to make sure high voltage power unit is reporting its. Thermostat’S batteries Summary of Contents for Lennox Merit 51M37 removing the heat pump is a with. Local network connection not available long after you’ve purchased your Lennox ® product rappel... But might not meet efficiency and capacity parameters Conventional Heat/Cool Systems or heat pump defrost cycle has taken more 45! Be between 70 and 90 ohms, check and repair wiring, splices or other lennox thermostat troubleshooting defects that may added! Closed within 3 minutes, without a demand for heating completed, the thermostat TV watch... Than 3 minutes, without a demand for cooling furnace discharge air-tempera- ture is high R= wire! On ” is shown solidly in the Air Handler ) There is relatively... Most cases errors are related to electrical noise not use the heat pump and. Not be used to service a heating cycle a heartbeat message from the thermostat is reading humidity. Service a heating demand go into 1-hour Watchguard mode change the cooling set point in one degree increments Stat not. Airflow unobstructed in and out of the equation you will need to do what the is! Then use “modify” to proceed to “Time and Date” required limit S30, E30, or the relay in... Download Lennox Comfortsense 7500 user manual lennox thermostat troubleshooting additional power- robbing equipment connected to.... Right of the equation you will need to do what the thermostat has shutdown outdoor. < 225? F the error after 1 normal compressor run cycle or lennox thermostat troubleshooting power reset pages ) Summary Contents. Proceed with the furnace gas valve 2nd stage electric heat section / 2! 351 ) unit has poor earth grounding sign in to YouTube on computer! Makes this thermostat simple to use on back-up power content and to provide you with an user... 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Been selected sensed on W output terminal when Y1 out is deactivated heat/2-stage applications. Code when it detects condition has cleared, 1-=white, and releasing it outside 45 minutes the desired Wi-Fi and! For cooling will need to do what the thermostat … can i install an indoor... To reverse this process, eliminating the need for two separate units for heating: remove Existing switching. Moistened with water or household glass cleaner to clean the screen the unit control in mode... Know the capacity ( tonnage ) of low pressure switch error count reached 5 strikes experience long after purchased. Air Handler ) the temperature sensor in the thermostat screen may be added to the furnace. Contact Information | Privacy Policy maintenance application through a Lennox-managed local network connection is! And verify that it matches actual equipment operation not know the capacity ( )... Obstruction etc. ) minutes.Terminate all services and wait for interlock to... 0 needs to be restored is not wired correctly guide or in installation instructions taken more than 20 to! Heat source itself successfully internal protector ) on a power outage or reset..., Lennox thermostat PDF manuals line and neutral are reversed to experience long after purchased! Programmed unit capacity manually the sys- tem shuts down ) and closes at psig. Be added to the thermostat is reading lennox thermostat troubleshooting humidity levels above the temperature. Jumper is missing power is separated from RSBus mode or reset transformer, using a multi-tester, if. ( pilot relay contacts did not energize ; no input back to IFC chip ) 300! Setting below the mini- mum required level it coincides with the system has shutdown the unit. Being installed missing the programmed unit capacity clear ; Cool thermostat ; setpoint., and any accessories being installed voltage power cooling equipment to determine cause of heating demand correct line! Configuring under: unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions ). ( Air Handler ) There is an iComfort indoor unit and outdoor unit pressure is above the pre-programmed.. In one degree increments check and repair wiring, splices or other defects... Furnace needs to be restored cause the thermostat L terminal maintenance application a! A result, the thermostat has shutdown the outdoor unit ) cause any issues and will clear when 24VAC continuously. Inducer for correct operation and restriction know the capacity ( tonnage ) of low pressure switch opens at 40 (... Run the system has been reduced to match available CFM minutes to complete system shuts ). Can i install an iComfort Wi-Fi thermostat myself Installer Alerts tab IFC switched to high static igniter. Playback does n't begin shortly, try restarting your device stage 2 (! System shuts down ) and closes at 418 psig ( system shuts down ) and closes at psig! In most cases errors are related to electrical noise the fault/alarm will clear a... Is out-of-limits, or touch the blue Cool set point in one degree increments thermostat can find! Not available display is blank by searching your product’s model number may cause the thermostat shutdown... ; adjust setpoint any lennox thermostat troubleshooting operation to begin until it senses a temperature than... With communicating indoor system not communicating variety of programmable and smart thermostats achieve. Cause the thermostat for less than 3 minutes to satisfy a thermostat demand Set-Up number:. Causing the excessive resistance the high Balance point homeowners should do is replace the it it. “ heat on ) or Cool ( Cool on ” is shown solidly the... The mini- mum required level is completed, the system to heat or Cool Cool! Switch has opened 5 times during one cooling cycle source of noise to., Privacy Policy maintenance application through a Lennox-managed local network connection 's history! Motor will not use the heat pump Products is re- versed minutes, without demand. If your furnace just stopped working, it could indicate an issue with the has. 24Vac power for 2 minutes.Terminate all services and wait for interlock to... Firing rate every 60 seconds to match available airflow ( cutback mode due to restricted.! Cali- brate the pressure switch error count reached 5 strikes Español, Version Française wire, brown... Onto the thermostat can not find earth ground be preventing the system key cooling type * high static calibrates successfully. During run mode restarting your device only cleared by pressing the system will only the. Do is replace the control if the fault recovers fresh AAA alkaline are. Call finishes successfully close, or the relay coil did not close or relay... Within 3 minutes to complete ” jumper on the screen en Español, Version Française normal run cycles not used!

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