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(Stat) The thermostat has found an unknown device on the system. Check for dirt or debris blocking air flow to outdoor unit. Check for proper configuring under Configuring Electric Heat Stages in the air handler installation instructions. Cleared after electrical heat detection is successful. How Do You Adjust a Lennox Thermostat? Check the power connections, check the amp draw at the transformer (the transformer maybe overloaded) and check 24VAC voltage at the DEVICE. (Outdoor Unit) The “W” output terminal on the outdoor unit is not wired correctly. Can I install an iComfort Wi-Fi thermostat myself? Correct voltage and frequency problems. Videos you watch may be added to the TV's watch history and influence TV recommendations. (Air Handler) The heat pump defrost cycle has taken more than 20 minutes to complete. The system will only use the heat pump to warm your home. Will clear after fault recovered. The alarm/fault clears after the issue is corrected. Check pressure (inches w.c.) of low pressure switch closing during a heat call. 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. As a result, the system has shutdown the outdoor unit. (Furnace) There is a problem with the furnace gas valve. The unit is reporting that its power line and neutral are reversed. Check for proper air flow. Check for dirty filters. Unit pressure is above the upper limit. Frequently Asked Questions. The system will go into Watchguard mode. Refer to suggestions given in Heating or Cooling System Does Not Turn On sections in this table. Check for additional power- robbing equipment connected to system. Remove the thermostat from the system while applying power and reprogramming. IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. Run the system in diagnostic mode and verify that it matches actual equipment operation. Smart thermostat (16 pages) Summary of Contents for Lennox Merit 51M37. To clear, replace filter if needed or repair/add duct. (Furnace) The furnace control board has not received 24VAC power for 2 minutes or more. I did R to R, 1+ … read more Heating or cooling equipment is not operating. Discharge or suction pressure out-of-limits, or compressor overloaded. Automatic or Manual Changeover - Humidity/Dehumidify Control Critical Alert. This alarm/code may indicate transformer overloading. If limit switch is not closed within 3 minutes, the unit will go into 1-hour Watchguard mode. The alarm/fault will clear when a heat call ends successfully. 3 Features This iComfort® E30 smart thermostat is an electronic, color display touchscreen and 7-day programmable interface which communicates directly with a Smart Hub Controller. Check operation of low pressure switch to see if it is stuck closed for longer than 150 seconds during a heat call . (Furnace) The reporting device cannot find earth ground. Download 82 Lennox Thermostat PDF manuals. Compressor ran more than 18 hours to satisfy a single thermostat demand. (Outdoor Unit) The “W” output on the outdoor unit has reported more than 5 errors. The transformer is typically mounted on the furnace or a nearby wall. (Outdoor Unit) Either the compressor ran for more than 18 hours continuously trying to cool the home or the refrigerant pressure in the sys- tem is low. Applicable only in communicating mode with non-communicating heat. Replace thermostat, if needed. The alarm/fault is cleared 300 seconds after the fault recovers. Typically, this alarm/code does not cause any issues and will clear on its own. Check for dirty filters. Temperature. [Indicated unif\ is resetting itself. Pressure switch opens at 40 psig (system shuts down) and closes at 90 psig (system restarts). System will clear code when it detects condition has cleared. Thermostat minimum-off time is activated. Check the functioning of the transformer, using a multi-tester, and replace it if it is faulty. Find your owner’s literature, like product manuals, by searching your product’s model number. Measure operating pressure (inches w.c.). Once the power is off, label and remove the wires from the thermostat. 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. (Furnace) The furnace control is not able to cali- brate the pressure switch. This thermostat is a 24VAC low-voltage thermostat and requires a common wire to the thermostat … Check and correct voltage. (Stat / Furnace / Air Handler / Outdoor Unit) The (stat, furnace, air-handier or outdoor unit) control parameters are corrupted. Mea- sure voltage of neutral to ground to ensure good unit ground. Check temperature rise, air flow and input rate. Equipment is unable to communicate. Measure operating pressure (inches w.c.). The alarm/fault is cleared 30 seconds after fault is detected as recov- ered. The system will go into Watchguard mode. Compressor runs less than 3 minutes to satisfy a thermostat demand. Check the voltage and line power frequency. Replace the jumper or put wire between terminals on control. As a result, the thermostat has shutdown the outdoor unit. has not communicated with thermostat for more than 3 minutes. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Stage 5 failed ( Same as code 351 ) a problem with the furnace igniter can not find icomfortenabled... 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