Re: my hunter thermostate keeps flashing a 4 and wont...
Hunter thermostats are not the highest quality. on the back of the thermostat there should be a not well identified reset button. You can locate and push this to attempt to fix the problem. Or purchase a new (i would suggest Robertshaw or braeburn) thermostat and install.
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you have to replace the thermostat . problems like this are common with latest electronic thermostats from china . most are going bad in less than 4 years . it so bad ,i am telling anyone who asks , to please keep there old regular thermostat , or if you have one of the old electronic ones (made over 10 years ago) hold on to it , it will last forever.... somehow when we moved the factory to china they forgot how to make thermostats that last ........ if you plan to rate this answer , please rate it 3 or 4 stars . this will help me stay in the paid answer department
replace the thermoste with a new one its easy to do
1.turn of breaker to doorbell air handler and compresser (outsideunit)
2 take of thermostat lble wires as to wich leters they conect to
3 put on new thermostat enshuring whires are conected to corect letter
4 turn on beakers and enjoy!!
Initially, I am inclined to suspect 3 possibilities:
sticking relay contacts (if used) (a possibility, least likely);
dusty thermal sensor/switch for the fan (likely);
time delay. design feature, will power down the fan only after a certain period that the heater has turned off. This is to dissipate residual heat not only on the heater but on the immediate surroundings of the heater element (most likely).