Check the continuity of thermostat wiring and that the wiring is correctly installed for your thermostat and the device it controls.See THERMOSTAT BACKUP BATTERIES - for temporary or full time operation If your thermostat is a model that relies on its own internal batteries all the time, Check for a dead thermostat battery. See LOW VOLTAGE TRANSFORMER TEST - separate article. If the heating system has electrical power but the thermostat is dead check for voltage at the low voltage transformer that powers the thermostat. See ELECTRICAL POWER SWITCH FOR HEAT where we explain these electrical switches on heating systems in more detail Next check that power is turned ON to the heating or cooling equipment - power off will often also turn off the thermostat since it's usually powered by a transformer connected to the same circuit as the indoor air handler, blower assembly, or furnace or boiler.If the heating or cooling system has no electrical power check for a blown thermostat or HVAC equipment fuse or tripped circuit breaker keep in mind that in addition to the fuse or circuit breaker powering the equipment, there may be fuses or switches inside the boiler or furnace itself.If your thermostat is a programmable unit that uses a digital display, if the display is blank you already know that the thermostat is either disconnected or has lost power. Check that the thermostat has electrial power .Here are the steps in figuring out what's wrong with a heating or cooling room thermostat: Ed 8/14/12 Reply: Things to check if a thermostat is just not workingĮd you're not giving us much to go on so my reply is a bit limited. My wall-mounted thermostat is not working.
Question: Wall thermostat is not working - what do I do? But if you think the problem is at the room thermostat for either cooling or heating, you can also start right here in the steps we give just below. If your heat won't turn on at all, the problem may not be at the thermostat at all. Heating & Cooling Control Thermostat Troubleshooting Guide 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. Page top photo: a basic room thermostat showing the red and white wires being switched by the thermostat and a place where it's easy to check for voltage. Here we suggest step by step procedures in diagnosing HVAC thermostat problems such as a thermostat that is not working at all or one that shows a blank thermostat display or a thermostat that does not turn heat on or off at the right temperatures. Heating or cooling room thermostat diagnosis: how to troubleshoot a heating or cooling room thermostat that is not working at all or is not working properly. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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