Hello, I have an issue my heat and my air conditioning aren't coming on and I
have a Honeywell Chronotherm III. The message on the screen keeps showing "-AC"
and the word temporary. What does this mean and how do we fix it?
from a quick web search:
AC means there is no power to the thermostat. It could be that the circuit
breaker is off or tripped, or your low voltage transformer (to your air
handler, furnace, or whatever you have) is bad. Does the fan come on when
you switch the fan switch from 'auto' to 'on'? If not, you have a power
problem (in other words, the 'AC' does not stand for Air Conditioning).
The flashing 'temp' means that you have adjusted the temperature away from
whatever you have programmed.
Somebody probably moved the temperature up or down from the programmed
setting. Hence the temperature is temporary. Look for a button
marked something like "resume" or "run program." Pressing that will
magically make that word disappear.
Another solution is RTFB.
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