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    Hot in Cali's Avatar
    Hot in Cali Posts: 1, Reputation: 1
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    #1

    Jun 28, 2015, 09:01 PM
    Display works but nothing else does
    Our thermostat is 21 years old. It is a Maple Chase. No model number on it. Everything stopped working today. Outside and inside unit. We have replaced the batteries. The thermostat has a display, will change temperatures but the unites are not responding. Circuit breakers have been checked. Two questions
    1) - What is the black switch behind the cover?
    2) - Any suggestions?

    Hot in California!
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
    Full Member
    		  
    #2

    Jun 29, 2015, 03:49 AM
    You might have a bad transformer in the furnace.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #3

    Jun 29, 2015, 11:41 AM
    Could be a lot of things, contactor, broken wire, bad compressor. With a unit that old, I'd upgrade if nothing else. Switch could be C to F conversion.
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