Set your thermostat to the COOL mode. Be sure that there are no cables sticking from the base and not letting the display sit properly. I have a Rheem RHPL-HM2421JC air handler, a Rheem 1.5 ton heat pump condensing unit, and a comfort control thermostat. If you see a green light blinking in the upper part of the display, your thermostat is starting, restarting, or the software is being updated. However, if the system is in cool mode and the fan is set to 'autoâ¦ The solution is quite simple: you need to take it to a place where its temperature sensor will have no temperature impact. Please, double-check your systems for compatibility! After disconnecting the sensor, you can check its resistance. ... Why is my display light not working? If it does not, contact White Rogers. Replace the batteries, if necessary. Try toggling the switch from Fan to Electric on and off; We hope â¦ There is a problem with the gas valve or the pilot light. One Hour Heating & Air Conditioning® of the Bay Area, Do Not Sell My Information - California Residents, Set the thermostat five degrees warmer during the heating season, Set the thermostat five degrees cooler during the cooling season, Replace the batteries (see the next question if this does not work), Flip the AC/Furnace switch on your circuit breaker to, Reset the thermostat – this can be done by flipping the switch from, Check to see if the batteries were placed correctly, Check the breaker, tripped breakers are common reason for why the thermostat is not working, Before doing anything turn off your heating or cooling unit, Check connections to make sure nothing has short circuited, Try toggling the switch from Fan to Electric on and off. When the system is on Auto, do the heat and cool temeratures tell the system when to kick on and off? 705: ... Alexa will confirm your request, saying âThermostat is in auto mode, aiming for 70°F (21.0°C)â. If the resistance of the sensor is within its normal values than poor contact in the terminals might be the reason why thermostat not working correctly. Move Fan switch from ON to Auto. The âautoâ setting. If there is a fuse box, make sure that the fuse is functional. Replace the screws and tighten them clockwise. Be sure that all wires are connected well. There you can get answers to all questions concerning your thermostat and related HVAC components. If the battery is very low, you may need to wait for about an hour. Damage could result from connecting the unit to an incompatible system, due to a power surge, or a short circuit. If neither the AC nor heater kicks in, check the colored wires under the cover and make sure they are not loose or damaged. The thermostat should start working. Connect it to RH. If the resistance of the sensor is within its normal values than poor contact in the terminals might be the reason why thermostat not working correctly. Thermostat not working. To remove the wire, push on the wire connector button. Remove the display by gently pulling it off its base. The thermostat should make a soft clicking sound and the background will turn orange (Sensi Touch) or the thermostat will display "Heating" under the set temperature. ... where the previous thermostat did not have a clock or timer: The previous RH or RC wire is the 24-volt transformer wire. See if that gets your thermostat to work again. Do the same thing for heat and be sure that the fan set to AUTO. Prior to checking, cut off power to avoid electrocution or damage to the system and/or thermostat. Contact Support at 1-855-733-5465 to find a pro-installer in your area. If you hear it kick in or feel that warm air is coming in, it is ok. When the thermostat fan setting is set to âon,â your systemâs fan will constantly run, regardless of whether or not your home is going through a heating or cooling cycle. Youâve probably seen the auto setting on your thermostat, but you may not really know what it means. The only way to get the furnace to start up is to place the system in "FAN" position to run the furnace continuously. If your thermostat is equipped with batteries, check them: not unlikely, they are dead. I know this probably isn't as difficult as I'm making it out to be, but I'm having a hard time understanding the Auto setting on my Honeywell TH5220D thermostat. Make sure your thermostat is in an area that is well insulated. With this hot whether the A/C is constantly running and the downstairs is freezing in split level basement. Check the setting on your thermostat and also test the circuit breaker to make sure the switches for your heating and cooling unit is set to “ON.”. Honeywell Round Thermostat Not Working And Auto Setting On Honeywell Thermostat GLAD TO SEE YOU HERE. If it has, flip it to the OFF, and then back to the ON position. Wait for several minutes until the unit switches on. Fan Works Only on FAN-ON Fan won't run if thermostat set to AUTO Room Thermostat FAN AUTO ON or OFF Switch FAQs Diagnosis & repair questions ... setting, and adjustment of the FAN ON- AUTO button or switch or the FAN ON-MAN switch on room thermostats. Just cool air blows. 5. If there is no click, most likely, you need to replace the batteries. Check the wire. If the resistance tends to infinity and / or shows Mega-Ohm values, then unfortunately, the heating core has broken. If itâs an outdated thermostat, consider replacing it with a newer model. Advanced units feature digital door latches, which won’t let the entire system work unless the door is closed. Typically, itâs not necessary for your heater to continually push air through your home to maintain the temperature. Also, there are ones featuring a function enabling you to control them from a PC or mobile device (smart phone, tablet, etc.). If the thermostat does not have continuity while the air conditioner is set to cooling, replace the thermostat. However, it will switch to the energy saving mode with most advanced features turned off. Most likely, they are dead. It is critical to consult your thermostat manual for instructions for Dometic thermostat wiring. Using a compressed air sprayer will help you with cleaning your wires with care. This mode should help prolong the battery’s life. It is advisable to check the AC, furnace, humidifier, or any other piece of equipment installed in your home. When I do turn the fan to the ON position, no hot air is blowing out of the vent. On auto, your energy bills may not fluctuate as much from month to month, and you may not experience the same level of comfort as you might if the fan had been left in â¦ Disconnect the display and gently pull it straight off. Thermostat functions as expected in both heating and cooling while in AUTO mode. 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