Thursday 4 February 2021

Variable Speed Heat Pump Failure - Cause?

Hi Everyone,

I would appreciate some help from the community on a potential cause:

4 Ton Bryant Evolution Extreme Heat Pump (280ANV048) with a Variable Speed Air Handler (FE4ANF005). System is 5 years old - 6 months over warranty!

We were having a windstorm with power going in and out every minute or two for a about half an hour. On one of the power cycling issues I got the following email alerts:

9:16 AM 95-High Current Lockout
11:17 AM 69-Inverter Compressor Internal Fault
11:23 AM 69-Inverter Compressor Internal Fault
11:23 AM 69-Inverter Compressor Internal Fault
12:06 PM 95-High Current Lockout
2:37 PM 95-High Current Lockout

At this point the alerts stopped. Installing contractor came over to troubleshoot. Distributor told them it was a compressor failure, they replaced compressor with a new one and it wouldnt start. They believe they had a bad compressor from the factory, but they didnt bench test it before putting in. Put in a second compressor, which they bench tested, outdoor unit still wouldnt start. They called the distributor who told them the inverter was bad as well.

At this point I stopped and filed an insurance claim and am running off backup heat strips.

Insurance company hired an independent evaluator who was unable to find a third party contractor to come out so made findings based on emails and phone calls with me and my contactor. They said the failure was not caused by a power surge (insurance covers power surge failure but not normal failure) because there was no visible arc damage and no other electronic devices in the house were damaged. They concluded the compressor failed and then damaged the inverter. Claim rejected.

I'm curious what you guys think. Does it make sense that the compressor would seize or lockup and this would damage the inverter? Is it possible its just coincidental that this catastrophic failure happened during a period of significant power instability? If I decide to replace the entire outdoor unit would I be on the hook for the cost of the compressor replacement, which didn't fix the issue? Any other ideas? Thanks.


source https://hvac-talk.com/vbb/showthread.php?2226351-Variable-Speed-Heat-Pump-Failure-Cause&goto=newpost

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