What else is on the circuit with the unit.? Most Units of that type need a dedicated circuit. If that is not the case..check the heating specs of the unit. Sometimes the amperage it draws in heating mode is far larger than the wiring can handle, therfore the breaker trips. Either that or the unit has a defect.
It should be on a separate outlet because that one outlet your using most likely is in series which means it shares power with other sources like lights and other outlets.Maybe try an outlet in a different room using a heavy extension chord 3 prong grounded. You might want to read the circuit breaker labels and see what area is not being used much.
SOURCE: Ruud heat pump outside unit trips circuit breaker
Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.
SOURCE: Room AC, reverse cycle..heat does not work.
if it is a Heat pump style the rev valve is in the Freon lines you will have to pull the unit out into the room out of it's sleeve which will stay in the wall ....it rev the flow of refrigerant is it cooling ok?? there is a solenoid on that valve that may be bad i would check that first you will have to look to see if it is energized in the heat or cool mode first to make sure it is switching it should look like a sideways tube with 3 outlets on one side and 1 inlet on the top and the solenoid coil as well with 2 wires going to it let me know what you find out ...1 Note the unit may have electric heat and the element maybe out you will have to pull to check
SOURCE: RUUD Central Air/Heat Pump
Start with the simplest first it,s not fun but it's necessary EVERY TIME. Clean your evaporator and condenser coil, change your air filter. Getting to the evap. coil is often a real headache and a result doesn't get done often. When its clogged as you probably know the refrigerant can't absorb heat at the coil so it tries to absorb heat on the way to the compressor freezing the hot gas line the safety circuits that protect the heat pump compressor from getting liquid refrigerant back to the compressor almost immediately will take the compressor of line (looking somewhat like a defrost cycle). I hope this helps it's a tough repair GL!
You might want to post this question in the appliances section.
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