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-   -   Robertshaw thermostat 9420 (https://www.askmehelpdesk.com/showthread.php?t=425607)

  • Dec 16, 2009, 12:05 PM
    akilsp
    Robertshaw thermostat 9420
    I set my temperature to 74 F last night. When I got up the temperature had automatically turned to 45 F. The air conditioner was running all night. This morning I set it back to 74 F, the temperature again went back to 45 F in a minute. I also tried to reset the thermostat. It did not work. What would be the problem

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