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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 14025
Experience:  15yrs in the HVAC industry with certificates and degrees.
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I have an Aprilaire 8400 Series Thermostat -

Customer Question

I have an Aprilaire 8400 Series Thermostat - non-programmable. All of the sudden it shows "OFF" and I cannot get that toi change or to star the heater, etc.
Submitted: 1 year ago.
Category: HVAC
Expert:  HVAC Guru replied 1 year ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a significant delay in responses. Please be patient and often I will ask you questions to narrow down the issue to get is diagnosed correctly.

What happens when you press MODE?

Expert:  HVAC Guru replied 1 year ago.

Does it do anything at all?