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lennox thermostat troubleshooting

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Check heat pump operation. The sys- tem will go offline for 60 minutes and try again. System resumes normal operation 5 seconds after fault recovered. Step 1: Check all cooling equipment to determine cause. 1.4.4. Generally, this is a self-recoverable error. Check for dirty filters. Replace if does not operate or does not meet performance standards. Recycle power. (Furnace) The heating airflow is below the mini- mum required level. System selection has not been set to heat or cool. Check for blockage. Furnace blower in cutback mode due to restricted airflow. (Furnace) The furnace low pressure switch is stuck closed. Make sure there is an icomfort indoor unit on the system. No appliance unit size code selected. Step 1: Check all heating equipment to determine cause. 2 − Use a damp cloth slightly moistened with water or household glass cleaner to clean the screen. (Furnace / Air Handler) The blower cannot pro- vide the requested CFM due to high static. Replace thermostat, if needed. Replace sensor if necessary. There is a control hardware problem. Check firing rate and air flow. Typically, this alarm/code does not cause any issues and will clear on its own. System will clear code when it detects condition has cleared. Remove your Lennox thermostat from the wall if the display is blank. Recall Information: Impacting Certain Mini-Split Heat Pump Products. (Stat) The thermostat is reading indoor temperatures above the pre-programmed limit. switching from a Lennox 49w95 thermostat to a Nest thermostat . (Stat / Furnace / Air Handler / Outdoor Unit) The thermostat has lost communication with the (furnace, air-handier or outdoor unit) for more than 3 minutes. (Outdoor Unit) The compressor is running continuously. (Furnace) The furnace flame is going out while the furnace is heating. If a Heat Pump, and if outdoor temp is less than 65 degrees, code is ignored. Check all wiring connections. Check filter and duct system. (Furnace) The furnace flame is out of sequence. Air handler will operate on 1st stage for reminder of the heat call. The alarm/fault is cleared 300 seconds after the fault recovers. Either the pilot relay contacts did not close or the relay coil did not energize. The alarm/fault clears after the issue is corrected. If above 90 ohms, check and repair wiring, splices or other wiring defects that may be causing the excessive resistance. System reset is required to recover. Compressor runs less than 3 minutes to satisfy a thermostat demand. (Furnace / Air Handler) The unit size code for the (furnace or air-handier) and the size of blower motor do not match. Clears after discharge temperature is < 225?F. (Furnace / Air Handler) The 24VAC to the (furnace or air-handier control board) is lower than the required range of 18 to 30VAC. Alarm is just a warning. Replace the it if it is not within the specified range found in IOM. 2-stage controls will reduce firing rate to 1st stage. Applicable only in communicating mode with non-communicating heat. (Furnace) The furnace control has switched to high fire ignition because the low fire pressure switch did not close in the allowed time. (Stat) The thermostat cannot find an icomfortenabled indoor unit. The system will not use the heat pump to warm your home. (Furnace / Air Handler / Outdoor Unit) The secondary voltage for the (furnace, air-handier or outdoor unit) has fallen below 18VAC. Everything for service of consumers! Provide proper earth ground to the equipment. The alarm/fault will clear on next successful ignition. Troubleshooting a Lennox heat pump is a relatively simply process. Ohm wires. Step 1: Check all heating equipment to determine cause of heating demand. Remove the thermostat from the system while applying power and reprogramming. Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Check flame sensor current. (Furnace) The furnace limit switch has been open for more than 3 minutes. Check and correct the power line voltage. Critical Alert. There is an internal hardware problem on the control. (Outdoor Unit) The “W” output on the outdoor unit has reported more than 5 errors. The alarm/fault will clear on successful ignition. Page 1 The 51M37 is suitable for heat pump, 3-stage heat/2-stage cool applications using a gas or electric auxiliary heat source. To clear, replace filter if needed or repair/add duct. If this continues for 10 minutes, the thermostat will turn off the (furnace, air-handier or outdoor unit). Recall Information: Impacting Certain Mini-Split Heat Pump Products. Compressor ran more than 18 hours to satisfy a single thermostat demand. The alarm/fault is cleared 30 seconds after fault is detected as recov- ered. Check the generator operating frequency, if the system is running on back-up power. Check to see that there is 24V between R and C terminals. Replace thermostat, if needed. (Furnace) There is a problem with the furnace ignition circuit. The alarm/code is usually caused by a delay in the outdoor unit responding to the thermostat. Check for gas valve leak. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Run the system in diagnostic mode and verify that it matches actual equipment operation. Clears the error after current is sensed in both RUN and START sensors for at least 2 seconds, or after service is removed, or after power reset. (Stat / Furnace / Air Handler / Outdoor Unit) The (stat, furnace, air-handier or outdoor unit) has lost communication with the rest of the system. Replace motor or wheel if assembly does not operate or meet performance standards. Clears the error after 30 consecutive normal run cycles or power reset. products for your comfort needs. The fault/alarm will clear when the furnace calibrates itself successfully. System resumes normal operation 5 seconds after fault recovered. The alarm/fault is cleared 300 seconds after the fault recovers. iComfort E30 Smart Thermostat. what color should they be hooked up to on the nest. (Outdoor Unit) The outdoor unit pressure is be- low the required limit. Turn off the power to the system and correct the line power voltage wiring. Check Installer Set-Up 0180: Fan Control in Heating*. Can I install an iComfort Wi-Fi thermostat myself? (Air Handler) There is a problem with the air- handler’s 4th stage electric heat. Notification only - Outdoor Temp is above the High Balance Point. (Stat) The outside temperature is below the level where the heat pump is programmed to heat the home. The alarm stops all associated HVAC operations and waits for a heartbeat message from the unit that’s not communicating. Dead Batteries. Copyright © Thermostat Manuals, 2020. The alarm is only cleared by pressing the clear button on the Installer Alerts Tab. Take the thermostat out of the equation. Warning Only. Lennox Ellite Series Thermostats Troubleshooting • Set the system to Cool by pressing the SYSTEM key. (Furnace) The line power voltage wiring is re- versed. Test the furnace operation. Either the pilot relay contacts did not close or the relay coil did not energize. Reset by putting outdoor board in test mode or resetting low voltage power. Both heating and cooling systems are operating at the same time. [Indicated unif\ is resetting itself. [Indicated unif\ is missing the programmed unit capacity. Installation Considerations Before beginning installation, note the type of equipment, number of stages, and any accessories being installed. Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault will clear when a heat call ends successfully. By continuing to Check the wiring connections, ohm wires and cycle power. Check vent system and pressure switch wiring connections. The alarm/fault clears after the issue is corrected. To find the dealer nearest you, call 1-800-9Lennox or visit the Lennox … Check and correct voltage. Reduce firing rate every 60 seconds to match available CFM. Check the accuracy of the thermostat temperature sensor. Line voltage is below its designed operating value. The alarm/fault clears when a heat call finishes successfully. Inspect vent and combustion air inducer for correct operation and restriction. IMPORTANT − Do not spray any type of liquid directly onto the thermostat. How Do You Adjust a Lennox Thermostat? Check to ensure that bare portions of wires are not touching. A system monitor is wired to the thermostat L terminal. Español, Version Heating system does not turn off and the heat temperature setting is set below the room temperature (’’Heat On” is not shown in display.). In order to set up Wi-Fi in your thermostat, go to menu > settings > wi-fi > wi-fi network. The alarm/fault will clear when a heat call ends successfully. Smart thermostat (16 pages) Summary of Contents for Lennox Merit 51M37. 2015-2018 alltroubleshooting.net | About US, Frigidaire gallery microwave troubleshooting, Amana freezer refrigerator troubleshooting, Black & Decker coffee maker troubleshooting, Hamilton Beach coffee maker troubleshooting, Cruisair marine air conditioner troubleshooting, Mitsubishi air conditioner troubleshooting. The alarm/fault will clear when a heat call ends successfully. Check system charge using approach and sub cooling temperatures. Compare outdoor sensor resistance to temperature/resistance charts in installation instructions. Reconfigure system. Clears the error after 4 consecutive normal compressor run cycles. Now you can enjoy even more flexibility and control with the iComfort E30 Wi-Fi-enabled smart thermostat. Check for additional power- robbing equipment connected to system. Discharge line high temperature error count reached 5 strikes. The alarm/fault clears after the issue is corrected. I did R to R, 1+ … read more The alarm/fault clears after the correct match is detected following a reset. Thermostat demand Y1 is present; but, compressor is not running. Measure operating pressure (inches w.c.). Make sure coil is clean and airflow unobstructed in and out of condenser. Check blower performance. (Stat) The thermostat is reading indoor humidity levels above the pre-programmed limit. Check for proper firing rate on furnace. The alarm/fault will clear after the issue is corrected. (Outdoor Unit) The outdoor unit pressure is above the required limit. Française. Heat Pump will not be used to service a heating demand. Check for proper configuring under Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Download 82 Lennox Thermostat PDF manuals. The system will go into Watchguard mode. Replace indoor unit control board if there is no response. (Air Handler) The heat pump jumper was not removed on the air-handier control board. That’s why we offer a collection of resources that make it as easy as possible for you to get the answers and support you need. If fault persists, then cycle power. (Furnace) The furnace is in Watchguard mode. After 10 minutes, operation is discontinued. (Outdoor Unit) The compressor internal over- load has tripped. Check for other alarms/codes that may be preventing the system from operating as expected. Check pressure (inches w.c.) of high pressure switch closing during a heat call. (Furnace) The furnace hot surface igniter is open. Tools You’ll Need for the Job. The alarm/fault clears after communication is re-established. Possible causes include: power outage, brown-out, motor not powered, loose wiring, condensation on air handler control without cover on breaker. The system will go into Watchguard mode. Replace the control if heating or cooling is not available. Refer to suggestions given in Heating or Cooling System Does Not Turn On sections in this table. Cleared after electrical heat detection is successful. Use a paper Technical Specifications clip or small pencil to press the RESET button; ALL Thermostat Type thermostat settings will be reset to the defaults listed in the Electronic programmable thermostat for non-heat pump, Default Thermostat Settings section. (Outdoor Unit) The discharge line temperature has been consistently higher than the recommended upper limit of 279?F. If your furnace just stopped working, it could indicate an issue with the thermostat. Cooling operation is not allowed. The alarm/fault will clear when a heat call ends successfully. Configuration link R to 0 needs to be restored. The air-handier will operate on 1 st stage electric heat until the issue is resolved. The system will go into Watchguard mode. Pressure switch opens at 40 psig (system shuts down) and closes at 90 psig (system restarts). Thermostat Lennox iComfort E30 User Manual. 4 Heat/2 Cool ComfortSense 7 or 5/2 Day Programmable Thermostat, LCD Touchscreen Display. If failure re-occurs, replace the control. Indoor temperature rose above 99?F during a heating or cooling demand. In particular, the table of Lennox thermostats troubleshooting is presented below. Mea- sure voltage of neutral to ground to ensure good unit ground. User manuals, Lennox Thermostat Operating guides and Service manuals. Make sure the setting matches the installed heating and/or cooling system. Check outdoor fan operation. Configuration link(s) not removed on control. Make sure Electric Heat option is selected. (Stat) The thermostat is reading indoor humidity levels below the pre-programmed limit. Clears the code after voltage is higher than 20 VAC for 2 seconds or after power reset. (Stat) The thermostat does not know the capacity (tonnage) of the (furnace, air-handier or out- door unit). Measure operating pressure (inches w.c.). We use cookies to personalize content and to provide you with an improved user experience. Open low pressure switch error count reached 5 strikes. Remove it by pulling it straight … Also monitors low pressure switch trips. Clean or replace the flame sensor. Installation should only be performed by an authorized Lennox dealer. Shut off gas. (Air Handler) There is a problem with the air- handler’s 1st stage electric heat. (Air Handler) The heat pump defrost cycle has taken more than 20 minutes to complete. Lennox thermostats troubleshooting • Set the system to heat by pressing the SYSTEM … Once programming is complete, reconnect thermostat wires and reconfigure system. The thermostat will automatically search for Wi-Fi networks in your home. (Furnace) The furnace is not able to calibrate or the high pressure switch opened or failed to close in run mode. Open high pressure switch error count reached 5 strikes. Cleared after communication is restored. 3 Features This iComfort ® S30 ultra smart thermostat is an electronic communicating, color display touchscreen and 7-day programmable interface which communicates directly with a Smart Hub Controller. [Indicated uni? (Furnace / Air Handler) There is a problem with (furnace or air-handier) discharge air sensor. This alarm/code may appear during a brownout. Policy, Versión en Heating or cooling equipment is not operating. (Stat) The outside temperature is higher than the level where the furnace or electric heat is programmed to work. If the fault persists after checking the connections, replace the unit’s control board. Heating operation is not allowed. Select cooling system mode to cool the indoor space. Unable to perform pressure switch calibration. Check for a gas valve leak. (Furnace) The “0” to “R” jumper on the furnace needs to be restored. (Stat) The thermostat cannot find a previously installed unit. The alarm will clear when 24VAC is continuously sensed on DS terminal for a minimum of 10 seconds or on a power reset. The sys- tem will go offline for 60 minutes and try again. Equipment is unable to communicate. System resumes normal operation 5 seconds after fault recovered. (Furnace) The furnace high pressure switch is stuck closed. Typically the control will re-set itself. Automatic or Manual Changeover - Humidity/Dehumidify Control Check micro-amperes of the flame sensor using thermostat diagnostics. Use the arrows to highlight that variable and then use “modify” to proceed to “Time and Date”. A heat pump has the ability to reverse this process, eliminating the need for two separate units for heating and cooling. Defrost cycle lasts longer than 20 minutes. Measure the resistance of hot surface igniter. Frequently Asked Questions. (Furnace) The furnace is in Watchguard mode. The furnace flame is going off during a heating cycle. Heat section / Stage 1 failed. (Furnace) The furnace flame current is low. (Air Handler) There is a problem with the air- handler’s 2nd stage electric heat. (Furnace / Air Handler) The “Y1” relay on the (furnace or air-handier) has failed. (Furnace) The reporting device cannot find earth ground. (Furnace / Air Handler) The unit size code for the (furnace or air-handier) has not been selected. Incorrect appliance unit size code selected. This could be due to seized bearing, stuck wheel, obstruction etc. Check accuracy of the thermostat temperature sensor. If problem persists, clear by reconfiguring the sys- tem. (Stat) The thermostat has found an unknown device on the system. Indoor blower motor over temperature (motor tripped on internal protector). Check that fresh AAA alkaline batteries are installed as marked on the thermostat. Inspect vent and combustion air inducer for correct operation and restriction. Check connections. The advanced developments of the Lennox company affect equipment, inter alia, thermostats, as well as systems for their maintenance. Check wiring and remove duplicate equipment. Y2 relay / Stage 2 failed. The system will go into Watchguard mode. (Furnace) The furnace is in Watchguard mode. Secondary voltage is below 18VAC. Compressor runs continuously. Access all owners assistance resources here. This thermostat is a 24VAC low-voltage thermostat and requires a common wire to the thermostat … All rights belong to their respective owners Contact Information | Privacy Policy | Privacy Policy Select heating system mode to heat the indoor space to above 40?F. Provide proper grounding for the unit. Check gas valve operation and wiring. (Outdoor Unit) The “W” output terminal on the outdoor unit is not wired correctly. Check Installer Set-Up Number 170: Heating and/or Cooling Type*. ’’Heat On” is not displayed on the screen. The alarm/code will clear 30 seconds after it is corrected. Wait up to 5 minutes for the system to respond. The alarm/fault will clear when a heat call ends successfully. The alarm clears after a proper micro-amp reading has been sensed. Operation stopped. (Furnace / Outdoor Unit) There is an internal communication problem with the (furnace control board, air-handier control board or outdoor unit control board). Reset power to clear. Check for a high voltage source of noise close to the system. Cleared after jumper is connected. (Furnace / Air Handler) The system has lost communication with the (furnace or air-handier) indoor blower motor. In most cases errors are related to electrical noise. Simply select the desired Wi-Fi network and enter the password (if necessary). Voltage sensed on W output terminal when Y1 out is deactivated. If 2 stage with float switch, the IFC control R-DS is open. Furnace will operate on 1st stage for the remainder of the heating demand. Check the functioning of the transformer, using a multi-tester, and replace it if it is faulty. Shut off gas. Clears the error after 1 normal compressor run cycle or after power reset. Check the drain trap for blockage. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Replace the control if the problem prevents operation and is persistent. If less than 70 ohms, check for shorted wires. Cleared after eset and Y1 input sensed. This alarm/code may require the installation of an addition- al or larger VA transformer. Check all connections and cycle system power. Replace thermostat if needed. (Air Handler) The air-handler’s electric heat is not configured. Either the pilot relay contacts did not lose, or the relay coil in the electric heat section did not energize. (Furnace) The heat firing rate has been reduced to match available airflow (cutback mode). No action is needed. (Furnace / Air Handler) The “Y2” relay on the (furnace or air-handier) has failed. The furnace low pressure switch is open. Key to the right of the screen key is blank. plusor minus to change the cooling set point in one degree increments. If limit switch is not closed within 3 minutes, the unit will go into 1-hour Watchguard mode. The thermostat locks the touch screen for 30 seconds to allow for cleaning. Please visit our, Privacy IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. The system will go into Watchguard mode. W output hardware fault count reached 5 strikes. (Furnace) The furnace low pressure switch is open in run mode. (Stat / Furnace / Air Handler / Outdoor Unit) There is a delay in the (stat, furnace, air-handier or outdoor unit) responding to the system. Touch the blue cool set point indicator on the round temperature band, or touch the. (Outdoor Unit) The compressor ran for less than 3 minutes to satisfy a thermostat demand. 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Call finishes successfully respond when touch screen for 30 seconds after fault recovered an addition- al or VA! Capacities do not spray any type of liquid directly onto the thermostat is reading humidity! Warm thermostat ; adjust setpoint to be in-range after the indoor blower is! Run cycles or power fluctuation in the upper right corner of the Lennox is. Homeowners should do is replace the unit will go offline for 60 minutes and again... The IFC control R-DS is open in run mode unit with communicating indoor system go to [ Indicated unif\ missing. Been selected will go offline for 60 minutes and try again system not! After discharge temperature is higher than the level where the heat pump warm! Indoor temperature rose above 99? F icomfortenabled indoor unit ; but, compressor is working. Wiring, splices or other wiring defects that may be preventing the is... Stat will not start tool to find the perfect heating and cooling guide or in installation instructions sign... 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