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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8172
Experience:  Furnace, A/C and heat pump specialist.
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The thermostat just went blank & remained a week. I replaced

Customer Question

The thermostat just went blank & remained for over a week. I replaced the batteries and face plate is working, but the HVAC and air conditioning will not come on. Inside temp is 81 but I can not get the thermostat 73 temperature to respond.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: The filter needs to be changed. The thermostat day of the week is on Mon but it was the same on yesterday and I could not get the unit to change settings. It is 1:14 pm and the time has been accurate since I inserted the new batteries.
JA: Do you plan on doing the work yourself?
Customer: Unless it is very difficult.
JA: Anything else we should know to help you best?
Customer: No.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Lets start by checking for power from the indoor unit.Do you have a multi meter for troubleshooting?

Customer: replied 1 year ago.
No. Not sure what this is.
Expert:  airheatman replied 1 year ago.

Do you have model on your indoor furnace or air handler?

Customer: replied 1 year ago.
The HVAC unit is in the attic. The air conditioning unit is outside.
Expert:  airheatman replied 1 year ago.

Look inside unit in attic and see if maybe there is a small fuse that is blown

Customer: replied 1 year ago.
The temperature here at the moment is 108, so I will have to wait much later to climb in the attic.
Expert:  airheatman replied 1 year ago.

I understand. We can go from there. Look for a small fuse on control board.

Customer: replied 1 year ago.
After that?
Expert:  airheatman replied 1 year ago.

If no blown fuse we will need to get the meter I mentioned earlier to troubleshoot.

You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.