HELP York Heat Pump Fault Code "multiple limits on single call for heat"

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Old 12-08-13, 11:47 AM
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HELP York Heat Pump Fault Code "multiple limits on single call for heat"

I have a York Heat pump and air handler with auxiliary heat. Heat pump yzb03611
Air handler MA14DN21, Heater 4HK16501806
Ever since it was installed it has faulted on this code. There have been 5 so-called technicians look at it and they come up with ridiculous reasons for the problem. I decided to trouble shoot it myself and have done the following:
Sped up the fan, changed the main control board in the air handler, changed the two limit switches, tried disconnecting one set of heater elements. The problem happened a couple times in a heating season initially, it happened more and more and now faults every day. (fan runs continuously to indicate a fault). Is there anything in the heat pump itself that can cause this? I can't find a schematic for the heat pump
 
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Old 12-08-13, 07:05 PM
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Do you have the installation manual for your heat pump and air handler?
Post the manual numbers if you have them.
 
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Old 12-08-13, 10:02 PM
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Old 12-09-13, 08:45 AM
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I have a similar system. The install manual for my air handler is here:

https://skydrive.live.com/redir?resi...nt=file%2c.pdf

I got this from the York website years back when they used to provide actual manuals rather than just advertising puffery.

You can see if it's the same control board, see pages 7,8,9 especially .
Maybe some other tips you can glean.

Also, do you get the faults if you operate in emergency heat - i.e. no heat pump.

I'm guessing that you've assured yourself of no blockage ... I had a similar problem which turned out to be a piece of the air handler sidewall insulation that had come unglued flapping into the air flow.
 
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