6/30/2023 0 Comments Proselect thermostatsIf the cooling system does not start continue.THERMOSTAT WIRE CONNECTIONS, or external influences. If the cooling system starts then the problem is most likely the thermostat setting,.Therefore to check whether or not setting the thermostat temperature down to its lowest setting (or to OFF) has turned OFF the heating system you need to listen to the heating unit itself to observe that it has stopped.įor air conditioning: if the cooling system wont' turn ON, that is if no cool air is being delivered even when you want it, we do the opposite: set the thermostat to its lowest temperature, or if your thermostat has a HEAT OFF COOL or FAN AUTO OFF control, set the control to COOL and FAN to AUTO. So for warm air heating systems, give the system a few minutes to shut down.įor hot water and steam heating systems, because the heating baseboards, convectors, or radiators will be hot and because they have some thermal mass, heat continues to be delivered for a longer interval even after the heating system itself has stopped. Watch out: for warm air heat blower units behave differently than hot water or steam heat systems: to avoid damage to the heat exchanger the air handler or blower unit will normally keep running for a minute or even a few minutes after the thermostat has stopped calling for heat. If the heating system does not start continue.See TEMPERATURE RESPONSE of ROOM THERMOSTATS. Or THERMOSTAT WIRE CONNECTIONS, or external influences like position of the thermostat on the wall, exposure to drafts, etc. If the heating system starts tthen the problem is most likely the thermostat setting,.If your thermostat has a HEAT OFF COOL or FAN AUTO OFF control, set the control to HEAT (for heating) and set the FAN to AUTO.įor help locating these thermostat switches Change the thermostat setting up or downįor heating: if the heating system won't turn ON, that is NO heat (or cooling) is being delivered when you want it, set the thermostat to its highest temperature setting and wait three to five minutes. If you're confident that the thermostat is not the problem, the see this separate article, HEAT WON'T TURN ON where we give diagnostic procedures for other reasons why building heating or cooling system will not turn on when it should. We explain how to rule out the thermostat in a "NO HEAT" diagnosis procedure. Here we discuss how to diagnose & fix a thermostat that seems to refuse to call for heating or cooling when it should. Thermostat Troubleshooting: heating or cooling system won't turn ON - Step 1 We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We include some simple VOM tests or DMM tests to check for a broken or "open" thermostat wire and tests to check for thermostat wires that are shorted together. We provide a sequence of diagnostic steps that determine if the problem is at the thermostat, the thermostat wiring, or at other heating or cooling system controls. Here we explain how to diagnose and fix hermostat wiring problems that cause a heating system or cooling system to stay OFF when it should turn on. We have no relationship with advertisers, products, or services discussed at this website.ĭiagnose & fix a room thermostat that that won't turn the heating or cooling system ON when it should - room thermostat troubleshooting: InspectAPedia tolerates no conflicts of interest.
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