Dig wrote:

this is the 2nd thermostat to fail in 3 years time its a digital Honeywell
ct8775a. I live in Florida and it fails in the summer time while on cooling.
the thermostat will register the 80 degree setpoint and turn on but not shut
off ( thermostat always read house temp at 80) the house was 74 degrees last
night, replaced the thermostat and all seems fine. I don't know why these
would fail in the same way, should I go with a normal honey well thermostat?
(non digital).
thanks in advance
jeff


FWIW, I've had a digital Honeywell (albeit not that model -- mine is a
CT3400) for a lot longer than three years, and it has performed
flawlessly.

I notice your model is powered from the 24VAC control voltage. You
might try one that is battery powered -- perhaps your area has a lot of
lightning-related power transients, and they are causing unreliability.
You might also check that your control transformer is actually providing
a voltage that is within the specs required by the thermostat.

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