Question about Mitsubishi Heating & Cooling
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Posted on Jan 02, 2017
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.
Posted on Nov 20, 2007
almost has to be the electric heat strip coils. they usually come on in stages. when the damaged strip comes on it kicks breaker. turn off all power, check with a meter , gently remove strips and inspect for broken or shorted coils. usually best to buy a new heat strip module. they are usually held in place as a module with 4 screws and a snap together wire connector .good luck. i have had some success if the wires are broken and not to brittle by bending a minute loop in the end of each wire and reconnect with the tiniest screw and washer and nut you can find, i'm talking real tiny. about the size of a bb if you can find em , or you can remove the damaged strip wire entirely to get some heat from remaining.
Posted on Nov 23, 2008
'Breakers' - are tripped because they are exceeding their amp limits.
The 'hotter' it gets outside - the 'harder' your AC has to work - and under normal circumstances this is not a problem - but when you have a fan motor or a compressor that is starting to 'break-down' (electrically) - often the AC's amp draw will exceed the limits of the breaker - thus 'tripping' the breaker.
I would suspect either the fan motor or the compressor is causing your breaker problem.
Eventually - the component (either the fan mtr or compressor) that is 'going bad' will go out completely and your breaker will 'trip' and not stay on when you try to reset it.
At this point you will need a Service Tech to determine which one is bad.
There is a possibility that your condenser coil (the one that blows hot air) is 'dirty' which will also cause a problem similar to the one you have - but it is less likely.
Also - if you've had the AC 're-charged' lately - it's possible you are in a 'over-charged' condition - but again, this is not very likely.
hope this helps.
Posted on Jun 12, 2010
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