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Posted by on June 21, 2008, 11:36 am
>On Sat, 21 Jun 2008 09:41:05 -0400, .p.jm wrote:
>
>>
>>>I'd be curious what brand unit you have.
>>>Some of the old GE's & Tranes use separate poles on the contactors so
>>>its possible for the compressor to run without the fan if the contractor
>>>goes bad or sticks like pjm noted.
>>
>> How about 'any heat pump' ? :-)
>
>Not really, there are only a few residential heat pumps or straight airs
>that you could see a compressor running without the condenser fan in a
>stuck contactor scenario. On a dual pole usually both contacts have to
>close for the compressor to run
True. And if it's welded, often both contacts are made ( even
though only one is stuck ).
>which would also have to make the fan run.
Depends on the fan relay, which of course is there
specifically to allow the compressor to run with no fan ( in defrost
).
>The exceptions I can think of is some old GE's & Tranes.
>On a single pole there's no question they both have to run.
Yes, there is great question, because that's not so.
If the unit is called 'off' by the stat, and both the
contactor and the fan relay are called 'open' by stat control ( via
the control board seeing no cooling call ), but the contactor is
welded - you have compressor with no fan.
>I'm not counting the possibility of something wrong with the fan motor or
>a defrost board keeping it from coming on because the OP said everything
>would run fine until the unit shut off.
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