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A/C hums even when turned off. A/C continues to run & cool even when turned to fan. There is a wall mounted thermostat

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Have you turned off he thermostat? Sounds like a contactor is stuck. ?Turn unit poer off at the circuit breaker panel If it is the cas, something will burn up.

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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I have new blower motor. it dosen't stop running


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I installed the thermostat via instructions. The fan will not turn off and even when all of the thermostat wires are disconnected, it continues to run


If the thermostat wires are in fact disconnected, there is either a short between the Red and Green wires (wires of any color connected to the R and G terminals) between the thernostat and the furnace OR the fan relay itself could have inadvertantly stuck closed.

My bet is the short happened when the wires were pushed back into the wall opening right behind the subbase.

Try removing ALL wires again and removing the sub-base from the wall and separating the wires back for a few inches (if length is available). You may find the fan shuts off.

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RVP 8000 A/C just experienced slight power surge. Compressor on.


I'm leaning toward sticky relay as well, but if you want to confirm it's not thermostat, remove thermostat from wall, and temporarily disconnect the yellow wire from thermostat (compressor) when/if, it happens again. If compressor stays running, I'd say relay for sure.
Just for future reference , Gray wire from thermostat is low fan, green wire is high fan, yellow is compressor, blue is ground. ( For cooling side) The red is 12 v + to furnace and white is negative to furnace.(heat side)

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Carrier Compressor Issues?


When you shut it off and back on it slugged the compressor if you turn it off and back on before the pressures equalize between the high and low sides it will slug the compressor and it will not run should let sit for five minutes or so before restarting. The humming is either the compressor making noise usually common for the compressor to make some noise or the fan motor bearings are getting bad on the outside unit. If the unit works normal probably not much you can do till it breaks if it is the compressor it is more economical to replace the whole unit if it is just the fan motor it is worth changing. You could take an amp draw on the fan motor and the compressor to see if the are within the limits on the name plate of the outside unit.

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1 Answer

The fan runs all the time.


Disconnect your thermostat from the wall. If the fan shuts off then you probably have a bad or miswired thermostat.
If it continues to run, disconnect the thermostat wires from the furnace. If this shuts the fan off then you have a problem with the thermostat wires.
If the fan continues to run with the thermostat wires off of the furnace,
then you have a problem with the furnace.
Even though the fan stays on...... does the furnace still work? If so I bet you have a bad or stuck blower relay. If the furnace does not function other than the blower than you most likely have a safety control that is open. Worst case you could have a bad circuit board.
Good luck.....

Apr 10, 2009 | Honeywell Electronic Programmable...

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Dometic a/c, duotherm thermostat, turns right back on after it reaches desired temperture.


I have a dometic 13500 BTU Roof mount a/c. It is set up with the duo-therm analog thermostat. The system cools fine. The problem is that the a/c gets down to the right temp, then it turns off like it should but turns right back on within a few seconds. Any help would be greatly appreciated.

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