wilkes

The compressor high temperature limit (among others) will interrupt the thermostat power. Have seen this caused by an ant. About the only thing you can try before calling the HVAC tech is make sure your filter and evap/condensor coils are clean. You could spray some electrical contact cleaner (disconnect power first) between all the electrical contacts on the outdoor unit. If the HVAC techs can't fix it I can but I am very expensive.

kranzoo, try resetting the unit by turning off the power at the disconnect or breaker box. Sometime this will help.

If you have no display on your thermostat you have lost the 24 volt low voltage power.Either you have no power (240 volt) to your unit or you have lost the 24 volt transformer or you could possibly have a loose connection in your new thermostat.If you have a volt meter you can measure the voltage at the thermostat between the red wire and the common (blue) wire. It should read 24 volts.Good luck. Probably need to call a good HVAC tech.

There's a great electrician on Liberty Grove-River Rd., across from Airport Rd. off Hwy. 268. Not at home where I can find his name and #. Doesn't charge an arm and a leg. Look in the yellow pages.

Thanks all. The unit is about 6 years old. Sounds like it would be best to call a pro and not try to fix it with an assortment of expensive parts that may not work.


If anyone else has suggestions, please chime in. Thanks again

moving is right too....its not common..but you could have a staple cutting into the tstat wire someplace

If I were forced to bet on the likely relay giving trouble...I'd follow the t-stat wires back to the relay/control module and say thats it.


But, they can be expensive and I don't know if its a part I'd want to buy without knowing it was the problem.

Use one of those electric wire gadgets (can't remember the name) to check the wiring for a broken wire.

kranzoo....a solid state relay will not go "in and out"..they are usually good or bad.


However..older style relays can be temperamental.


This problem may be hard to trace..it will probably require the ability to use an electrical meter and the ability to read wiring diagrams usually located on the inside of the access cover.

Thanks NancyG for the reply, but can a relay go in and out? The replacement of the thermostat temporarily cured the problem....Please comment, thanks

relay

Hope someone can suggest a fix. I replaced my heat pump thermostat about two weeks ago with the exact same one. Worked fine for about two weeks and now it has done the same thing as the original one.


There is no power to it and it no longer is functional. Sounds like the thermostat is not the problem, but something else causing it to fail. Any suggestions as to the possible cause??


Thanks in advance for any advice that may help!