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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a 1E78 5/2 day programmable thermostat. I had a low

Customer Question

I have a 1E78 5/2 day programmable thermostat. I had a low battery display. I changed the batteries now the display shows HOLD. When I rest the run button, nothing happens.
Result is the heat is not on and it should be.
Help please.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

What are the numbers following the 1E78?

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