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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Thermostat will not light or function even after changing

Customer Question

Thermostat will not light or function even after changing batteries.
Submitted: 2 years ago.
Category: HVAC
Expert:  Tim H. replied 2 years ago.
Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite. At the end of our dialog you will be asked to rate my service, but please wait until then and all your question(s) have been answered satisfactorily. Thanks for your business!
Do you have 24 volts AC as measured from the red wire on R to any other wire up at the stat?
Customer: replied 2 years ago.
I do not understand your reply. I do not know where the red wire is and do not have equipment to measure volts. We have a typical airconditioning/heating system.
Expert:  Tim H. replied 2 years ago.
I would need to know if there is 24 volts up at the thermostat wires. This will quickly help me determine if it's a bad thermostat or some other issue.
Other things to check:
Is the switch at the furnace turned on?
Blower door on securely?
Furnace circuit breaker tripped?

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