AIRCONDITIONING UNIT NOT TURNING ON AND THE THERMOSTAT IS NOT ON EITHER. BREAKERS ARE NOT TRIPPED.

before we determine if it is an a/c issue, we first have to see if the thermostat is working properly. Need info on that to see if there are problems with that which can prevent the unit from running.

Sounds to me like a breaker has popped. In the main power panel, see if one of the breakers is in the center position.

The thermostat wire may have and break and not getting power. Honeywell Customer Assistance at 1-800-468-1502

Have you checked the power source for tripped breakers burnt, a burnt fuse etc?

You will need to change the overload relay and run relay on the compressor.
Here is the overload relay.
Here is the run relay.

This thermostat has batteries. Try replacing the batteries. You may have to reprogram and make sure it is on.

site shows this thermostat is a non programmable unit and has been discontinued. none of the info sheets including a pdf shows a replacement battery. this thermostat operates off line voltage only. check for a control fuse or breaker on your heating unit.

Well, it's an be only one of three things then (in order) -

1) Bad wiring connection, particularly the middle pair of white and black wires connected to the supply wiring, or
2) One of the breakers or fuses has tripped or blown, or
3) Bad thermostat.

If 1 is OK, check 2 (double check if breakers, sometimes they don't look tripped when they are), and lastly, take the stat back and get another one.

The ground is secondary, and it is assumed your living in a house where 14-2, 12-2, or 10-2 with ground was NOT used. If it was, hook up the ground. If not, it's OK. The grounding requirement was added to the NEC after your house or whatever was built. It is not electrically active or needed for this circuit.

Reply back what your findings are. Will be glad to help!

yea,, assuming you were self cleaning when this happened?? something got to hot and tripped the oven safety thermostsat(most likely) hte unit would have to be pulled out from wall for hte thermostat is located behind unit on back wall.. did you ck the circuit breakers, its a double perhaps 1 is tripped?

Most likely the transformer is shot on the air handler. To test this go to the thermostat and move the selector to fan on, if the fan blows it's not the transformer. Let me know. THX RepairUSA