YORK compressor won't always start

Posted by Real Pisser on August 31, 2009, 10:58 pm

> Cant_Sleep wrote:

>> Hello gang. I've got an issue I'm trying to diagnose, and some of the
>> posting I've read on this site are very helpful. I'm the owner of the
>> unit, and I've gone through multiple technicians who have been
>> unsuccessful. I'm not on here to cut corners, and I'm no
>> do-it-yourself'er. I'm currently working with a knowledgable tech that I
>> trust, but he's running out of idea. And he's been working directly with
>> the YORK technical service rep in our area.
>> So here it goes. Live it Phoenix, and it's been 110/day. Unit running
>> fine all summer, turned off for 1 week vacation, and issues arose upon
>> return. Unit is 3.5 ton YORK heat pump, circa 1985. Well maintained,
>> and
>> in generally good shape...just old.
>> When turned on, in AC mode, the inside blower would run, but neither the
>> fan or compressor would start on outside unit. But this proved to be
>> intermittent. Unit would sometimes start, but then would run short while
>> and kick off, with the "EM Heat" light coming on. In general, it'd run
>> in
>> the cooler mornings, and error in the hot afternoons and evenings. I'm
>> not sure the significance, but the pattern was beyond coincidence.
>> The YORK tech determined one of the sensors was bad (Ambient sensor,
>> discharge sensor, liquid sensor, DS Defrost sensor). The tech suggested
>> jumpering two pins in the control module, to take these sensors out of
>> circuit. We did that, problem appeared to be solved, as the unit fired
>> right up, and cooled without issue that night and next day.
>> End of next day, different problem (prob same problem, but now different
>> manifestation given elimination of sensors). Now the outside unit fan
>> motor always turns on, but compressor does not. Unit just blows warm air
>> in the house. Like clockwork, three days in a row now, I leave the unit
>> off until it cools down outside, then it fires right up and runs until
>> the
>> next day's afternoon. When it's running, air is ice cold and cools the
>> house immediately.
>> Any direction would be great help. The current direction my tech has
>> recommended was adding a "hard-start" kit, which I understand to be a
>> higher charging cap? While this new cap can't hurt, I assume, I'm
>> wondering about whether the reversing solenoid or the high pressure
>> sensor
>> might be to blame?
>> Lastly, if it ends up being the HP sensor, and assume the sensor works,
>> any ideas on what temperature-related scenario could be creating the high
>> pressure?
>> Thank you all, for your time.
>> -------------------------------------

> During the hottest part of the summer, I had a customer who's
> 2.5 ton Carrier condensing unit became a bit recalcitrant when
> it came to starting. A small kick-start unit cured the problem.
> Ask you service tech to try a suitably sized start assist device.
> TDD

Wow, that must hurt if it backfires.

Posted by Stormin Mormon on September 1, 2009, 8:01 am

With the heat, and what he was describing. Sounded more like
it was cycling on thermal overload.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

> Wow, that must hurt if it backfires.

I've had the damn things break connecting rods in a recip
before.
It was TOO big for the unit. His compressor may just need a
little
boost.

TDD

Posted by Lefty on September 1, 2009, 5:11 pm

> Hello gang.

<snip>

Dude.

That's very old for a heat pump. You mention that it's well maintained, but
make no mention of any part being replaced since Rick Springfield was all
the rage. Do you actually know the history of this unit? For starters, I
don't think anyone makes a contactor or capacitor that would possibly last
that long these days. A YORK unit should be convertible to AC only FWIR.
They were doing it in the factory in '88. That would eliminate many of
potential heat pump issues for the time being to see what's what. You know
the condenser only is a fairly simple contraption?

HTH, Lefty

Posted by on September 1, 2009, 6:01 pm

wrote:

>> Hello gang.

>Dude.
>That's very old for a heat pump. You mention that it's well maintained, but
>make no mention of any part being replaced since Rick Springfield was all
>the rage.

What exactly do you mean by 'since' there, camper ?

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Posted by Lefty on September 1, 2009, 9:30 pm

> What exactly do you mean by 'since' there, camper ?

LOL, like any fourteen year old girl these days has ever heard of Rick
Springfield. He's been replaced twenty five times over by the iCarly's and
Hannah Montanas and such just like the Michael Jacksons and Elvises (Elvi?)
before him.

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YORK compressor won't always start - Page 3