(Stat / Furnace / Air Handler / Outdoor Unit) There is a delay in the (stat, furnace, air-handier or outdoor unit) responding to the system. Check and correct voltage. Clean or replace the flame sensor. This alarm/code may indicate transformer overloading. Heat pump troubleshooting for common problems that can cause your indoor unit to not kick on include looking for: Circuit breaker tripped – Your indoor and outdoor units are on separate breakers. Reconfigure system. Compare outdoor sensor resistance to temperature/resistance charts in installation instructions. (Stat / Furnace / Air Handler / Outdoor Unit) The (stat, furnace, air-handier or outdoor unit) has lost communication with the rest of the system. If problem persists, then check all DEVICE connections to make sure they are icomfortcompatible. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Replace the control if the problem prevents operation and is persistent. Shut off gas. (Air Handler) An air-handier configuration jump- er is missing. Alarm clears 300 seconds after Y1 input sensed OFF. • If the problem has not been identified and corrected, contact a qualified service technician. (Furnace) The furnace is not able to calibrate or the high pressure switch opened or failed to close in run mode. A system monitor is wired to the thermostat L terminal. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Ohm wires. Warning Only. The thermo- stat will not allow any heating operation to begin until it senses a temperature lower than 99?F. Replace the jumper or put wire between terminals on control. (Stat) The thermostat is reading indoor temperatures above the pre-programmed limit. Step 1: Check all cooling equipment to determine cause. (Outdoor Unit) The outdoor unit pressure is above the required limit. The fault/alarm will clear when the furnace calibrates itself successfully. Cleared after communication is restored. Tangled wiring may be a cause too. The alarm/fault is cleared 300 seconds after the fault recovers. 3. Check Installer Set-Up 0180: Fan Control in Heating. Lennox makes no warranty or representation regarding these recommendations. (Stat) The thermostat does not know the capacity (tonnage) of the (furnace, air-handier or out- door unit). Inspect vent and combustion air inducer for correct operation and restriction. What is most important for these pumps, though, are the heat pump compressors. Heat call with no configured or mis-configured electric heat. Clears after discharge temperature is < 225?F. (Stat) The system has been heating for at least 15 minutes, without a demand for heating. Replace the control if the problem prevents operation and is persistent. (Stat) The thermostat is reading indoor humidity levels below the pre-programmed limit. Heat section / Stage 1 failed. (Stat) The outside temperature is below the level where the heat pump is programmed to heat the home. 24-Volt Power Low (Range is 18 to 30 volts). ’’Heat On” is not displayed on the screen. MORE key remains blank unless the Furnace Filter Change Reminder has been turned on. Correct voltage and frequency problems. Discharge line temperature is > 279?F. However, clarifying the issue using this simple heat pump troubleshooting guide can help you explain the problem to the technician and understand proposed repairs. Test the furnace operation. Check all connections and cycle system power. Restricted airflow - Indoor blower is running at a reduced CFM (Cutback Mode - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8” e.g.. total external static pressure). This could be due to seized bearing, stuck wheel, obstruction etc. Also monitors low pressure switch trips. (Furnace / Air Handler / Outdoor Unit) The secondary voltage for the (furnace, air-handier or outdoor unit) has fallen below 18VAC. If homeowner has implemented a dedicated N band router for the purpose of video streaming, a separate router for the thermostat may be required. System will clear code when it detects condition has cleared. Check for proper earth ground to the system. • Check the heat temperature setting to be sure it is set above the room temperature and “Heat On” is displayed solidly on the screen. Everything for service of consumers! Find your electrical panel and switch off the electrical supply to your furnace. Check the voltage and line power frequency. Thermostat did not find an Indoor Unit. Check the drain trap for blockage. Replace thermostat, if needed. Select 1 Stage AC Unit or 2 Stage AC Unit and press save. Check the Thermostat. Reset power to clear. Reset by putting outdoor board in test mode or resetting low voltage power. System selection not set to Heat or Cool. If voltage is not present, check the heating equipment to find the cause of the problem. This event may occur during a power outage or power fluctuation in the system. Correct voltage and frequency problems. Check filter and duct system. Check for proper configuring under Configuring Electric Heat Stages in the air handler installation instructions. Indoor temperature rose above 99?F during a heating or cooling demand. (Outdoor Unit) The outdoor unit pressure is be- low the required limit. Thermostat is calling for Heat (Heat on) or Cool (Cool on) but no heating or cooling is running. Clear by reconfiguring the system. The alarm/fault clears after the issue is corrected. Press the setup tab, press start, and press confirm. If your indoor air handler isn’t turning on, check your home’s electrical panel for a tripped circuit breaker. (Furnace / Air Handler) The “Y2” relay on the (furnace or air-handier) has failed. The system will go into Watchguard mode. Replace the gas valve if needed. (Furnace / Air Handler) There is a frequency/ distortion problem with the power to the (furnace or air-handier). ... (Stat) The outside temperature is below the level where the heat pump is programmed to heat the home. High Balance Point and Low Balance Point are now listed; adjust the balance point settings and press save. (Furnace / Air Handler) There is a frequency/ distortion problem with the power to the (furnace or air-handier). Some or all keys on the display do not work; why not? Recalibrate thermostat to clear. The alarm/code will clear 30 seconds after it is corrected. Should read 325 millivolts minimum with optional wall switch “OFF.” Replace faulty thermopile if reading is below specified minimum. Compressor runs less than 3 minutes to satisfy a thermostat demand. Key to the right of the screen key is blank. (Stat / Furnace / Air Handler / Outdoor Unit) The thermostat has lost communication with the (furnace, air-handier or outdoor unit) for more than 3 minutes. Lost communication with indoor blower motor. Check operation of low pressure switch to see if it is stuck open during a heat call. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Reset rollout switch. Check filter and duct system. (Stat) The thermostat is reading an indoor temperature that is higher than 99?F. Critical Alert. Check all connections and cycle system power. Check that AAA batteries are installed correctly and are good. Critical Alert. Make sure the setting matches the installed heating and/or cooling system. The system will go into Watchguard mode. Please program the correct capacity of the (furnace, air-handier or outdoor unit). - Disconnect the outdoor sensor or discharge sensor. (Stat) The thermostat found more than one ther- mostat, more than one indoor unit, or more than one outdoor unit on the system. This impacts your electric bill but not heat output. In particular, the table of Lennox thermostats troubleshooting is presented below. User manuals, Lennox Heat Pump Operating guides and Service manuals. Step 1: Check all cooling equipment to determine cause of cooling demand. Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Heat Pump will not be used to service a heating demand. (Stat) The thermostat is reading indoor humidity levels above the pre-programmed limit. Learn how to avoid common problems with mini split air conditioners and heat pumps, how to recognize the symptoms and troubleshoot correctly. Troubleshooting when a heat pump is not defrosting. (Basic is the most popular) and press the save button. Check for a gas valve leak. Good luck. Turn off the power to the system and correct the line power voltage wiring. 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