Check the functioning of the transformer, using a multi-tester, and replace it if it is faulty. The thermo- stat will not allow any heating operation to begin until it senses a temperature lower than 99?F. (Furnace) The furnace control board has not received 24VAC power for 2 minutes or more. The alarm will clear after commissioning is complete. Recall Information: Impacting Certain Mini-Split Heat Pump Products. Perfect comfort is something we want you to experience long after youâve purchased your Lennox ® product. Either the pilot relay contacts did not close or the relay coil did not energize. After on-line registration is completed, the As a result, the thermostat has shutdown the outdoor unit. Policy, Versión en Test the furnace operation. Check firing rate and air flow. (Furnace) The furnace is in Watchguard mode. (Furnace) The reporting device cannot find earth ground. (Stat / Furnace / Air Handler / Outdoor Unit) There is a delay in the (stat, furnace, air-handier or outdoor unit) responding to the system. Measure operating pressure (inches w.c.). The alarm/fault clears after communication is re-established. (Outdoor Unit) The compressor internal over- load has tripped. Wait up to 5 minutes for the system to respond. (Furnace) There is over current in the furnace inducer motor. plusor minus to change the cooling set point in one degree increments. Thatâs why we offer a collection of resources that make it as easy as possible for you to get the answers and support you need. Troubleshooting..Page 20 Electrical tape General Thermostat Location The Lennox X4147 programmable Install the thermostat about 5 feet touch-screen thermostat provides (1.5m) above the floor in an area with control for up to three stages of heating good air circulation. (Furnace / Air Handler) The unit size code for the (furnace or air-handier) and the size of blower motor do not match. Compressor minimum-off timer is activated. This will damage the thermostat and void the warranty. Set the System setting to Cool and set the temperature setting below the room temperature. Check for proper gas flow. 4 Heat/2 Cool ComfortSense 7 or 5/2 Day Programmable Thermostat, LCD Touchscreen Display. Warning Only. Critical Alert. [Indicated uni? Indoor temperature rose above 99?F during a heating or cooling demand. Check the generator operating frequency, if the system is running on back-up power. Measure operating pressure (inches w.c.). The system will go into Watchguard mode. The alarm/fault will clear on next successful ignition. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Pressure switch opens at 590 psig (system shuts down) and closes at 418 psig (system restarts). Provide proper earth ground to the equipment. Possible causes include: power outage, brown-out, motor not powered, loose wiring, condensation on air handler control without cover on breaker. Copyright © Thermostat Manuals, 2020. If your furnace just stopped working, it could indicate an issue with the thermostat. The alarm/fault will clear when a heat call ends successfully. (Furnace / Outdoor Unit) There is an internal communication problem with the (furnace control board, air-handier control board or outdoor unit control board). The alarm will clear when 24VAC is continuously sensed on DS terminal for a minimum of 10 seconds or on a power reset. Press the setup tab, press start, and press confirm. Dead Batteries. Configuration link R to 0 needs to be restored. The thermostat will not allow any cooling operation to begin until it senses a temperature higher than 40?F. Page 1 The 51M37 is suitable for heat pump, 3-stage heat/2-stage cool applications using a gas or electric auxiliary heat source. Recycle power. Check all wiring connections. Replace the gas valve if needed. The system will go into Watchguard mode. Check to ensure that cooling equipment is not stuck ON. Compressor runs less than 3 minutes to satisfy a thermostat demand. Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Page 3: Remove Existing Thermostat I did R to R, 1+ â¦ read more This thermostat is a 24VAC low-voltage thermostat and requires a common wire to the thermostat â¦ Check for a gas valve leak. Furnace blower in cutback mode due to restricted airflow. Compressor runs continuously. Check system charge using approach and sub cooling temperatures. (Stat) The system has been cooling for at least 15 minutes, without a demand for cooling. System resumes normal operation 5 seconds after fault recovered. The alarm/fault will clear when a heat call ends successfully. (Furnace) The furnace gas valve 2nd stage relay is faulty. Check power to unit. Now you can enjoy even more flexibility and control with the iComfort E30 Wi-Fi-enabled smart thermostat. To avoid this, cancel and sign in to YouTube on your computer. The alarm/fault is cleared 300 seconds after the fault recovers. Check to ensure that bare portions of wires are not touching. The system will go into Watchguard mode. Step 1: Check all heating equipment to determine cause. User manuals, Lennox Thermostat Operating guides and Service manuals. Typically, this alarm/code does not cause any issues and will clear on its own. The advanced developments of the Lennox company affect equipment, inter alia, thermostats, as well as systems for their maintenance. Red LED is lit in the upper right corner of the thermostat when the system monitor detects a possible problem. Replace thermostat if needed. 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