Run the system in diagnostic mode and verify that it matches actual equipment operation. Thermostat will display Settings were copied after successfully copying the information to the new control. Learn how to avoid common problems with mini split air conditioners and heat pumps, how to recognize the symptoms and troubleshoot correctly. (Outdoor Unit) The outdoor unit pressure is above the required limit. Either the pilot relay contacts did not lose, or the relay coil in the electric heat section did not energize. (Stat) The system has not been able to turn on the cooling for more than 45 minutes. [Indicated unif\ is resetting itself. 1. I turned thermostat to off waited 5 minutes, turned back to heat system mode, set temperature 2 degrees higher. The furnace is in “watchguard” mode (moderate alert) and will not display the red critical alert icon nor be displayed in the homeowner alert button. (Stat) The system has been heating for at least 15 minutes, without a demand for heating. The fault/alarm will clear when the furnace calibrates itself successfully. (Furnace) The furnace high pressure switch is failing to close. High Balance Point and Low Balance Point are now listed; adjust the balance point settings and press save. Key to the right of the screen key is blank. Typically the control will re-set itself. It’s possible that, if the weather is especially cold, your heat pump could run near-constantly without there being an issue. If you don’t have the necessary knowledge and skills, call a heating repair technician (HomeAdvisor).. Heat Pump Doesn’t Heat or Cool Right. If homeowner has implemented a dedicated N band router for the purpose of video streaming, a separate router for the thermostat may be required. If problem persists, clear by reconfiguring the sys- tem. Thermostat did not find an Indoor Unit. Scroll down the menu item choices to Balance Point Control and press edit. In most cases errors are related to electrical noise. Replace the icomfort thermostat with a conventional thermostat that has a dual fuel control mode (e.g. Merit Series 13HPX heat pump pdf manual download. ’’Cool On” is not displayed on the screen. - The thermostat system setting does not offer a emerg. If problem persists, then check all DEVICE connections to make sure they are icomfortcompatible. Balance Point Control must be enabled to display as the High Balance Point and Low Balance Point in the menu and pro- vide the ability for the installer to adjust the setpoint. What is most important for these pumps, though, are the heat pump compressors. (Stat) The thermostat is reading an indoor tem- perature that is lower than 40°F. Check accuracy of the thermostat temperature sensor. Take reading at thermopile terminals of gas valve. Clears the code after voltage is higher than 20 VAC for 2 seconds or after power reset. Clears after discharge temperature is < 225?F. The furnace igniter cannot turn on the flame. Applicable in non communicating mode. If persistent or if it coincides with the system operation then proceed with the following steps. (Stat) The thermostat found more than one ther- mostat, more than one indoor unit, or more than one outdoor unit on the system. The thermostat will shut down the system. If “Heat On” is shown solidly in the display, but the heating system does not turn on. Verify operation of equipment in system test mode. Outdoor temperature is not displayed on the thermostat. Lennox makes no warranty or representation regarding these recommendations. The alarm/fault will clear when a heat call ends successfully. Check for additional power- robbing equipment connected to system. The furnace flame is going off during a heating cycle. Check thermopile with millivolt meter. Reset rollout switch. The alarm/fault is cleared after the current service demand is satisfied. Identify the problem and its causes, and fix the device – the tables cover the entire range of issues that can be eliminated manually, or with WiFi connection. (Stat) The thermostat is reading an indoor temperature that is lower than 40?F. The alarm/fault is cleared 300 seconds after the fault recovers. (Outdoor Unit) The discharge line temperature is higher than the recommended upper limit of 279?F. Backlighting seems dim; is it designed to be dim? This event may occur during a power outage or power fluctuation in the system. Check for gas valve leak. lennox heat pump troubleshooting guide is available in our digital library an online access to it is set as public so you can download it instantly. An unknown device is seen on the subnet in or outside of configuration mode. This alarm/code may appear during a brownout. 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. The thermostat will not allow any cooling operation to begin un- til it senses a temperature higher than 40°F. Cut O-R. Applicable with non communicating outdoor unit with communicating indoor system. Check and correct the power line voltage. (Outdoor Unit) Either the discharge or suction pressure level is out-of-limits, or the is compressor overloaded. (Furnace) The furnace flame current is low. Lennox thermostats troubleshooting The advanced developments of the Lennox company affect equipment, inter alia, thermostats, as well as systems for their maintenance. (Stat) The thermostat is reading indoor humidity levels below the pre-programmed limit. (Furnace) The reporting unit has poor earth grounding. In case of Lennox heat pump not working you should address these checklists. Check connections. A non-communicating 2-stage out- door unit was added to the system but the unit only runs in 2nd stage. Indoor Unit (furnace or air-handier) will not be used to service a heating demand. This article is for troubleshooting heat pumps only. Measure voltage of neutral to ground to ensure good unit ground. Both heating and cooling systems are operating at the same time. Check wiring and remove duplicate equipment. (Outdoor Unit) The high pressure switch has opened 5 times during one cooling cycle. To clear, replace filter if needed or repair/add duct. Check for a high voltage source of noise close to the system. (Furnace) The line power voltage wiring is re- versed. Indoor temperature rose above 99°F during a heating or cooling demand. Make sure the setting matches the installed heating and/or cooling system. (Furnace) The furnace primary limit switch is open. Set the System setting to Heat and set the temperature setting above the room temperature. The icomfort system is capable of copying settings from the previous configuration to the new compatible device (control) found. (Stat) The (furnace, air-handier or outdoor unit) is resetting itself. Heat pump iced-up in Winter: Heat pumps can ice-up during the winter time. Check for dirty filters and other air flow restrictions. When you read information on the web double check that the information is correct. (Furnace / Air Handler) The unit size code for the (furnace or air-handier) and the size of blower motor do not match. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Either the pilot relay contacts did not close or the relay coil did not energize. On the home screen, press the right arrow Q3 then press the display settings button. Thermostat did not find an Indoor Unit. Heat section / Stage 1 failed. Common heat pump compressor problems can often be diagnosed by the homeowner, without the need to call a costly service repair technician. The sys- tem will go offline for 60 minutes and try again. Measure the resistance of hot surface igniter. Heat pump running constantly. 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