I wonder if the kick start (relay) kit (circuit) might be the source. It
would be energized during non-operational periods and drop out within
seconds of your heat pump turning on. The kits normally use a relay to
insert the additional kick start capacitor at turn on and then remove it
when it is time for normal run capacitor to be inserted into the scheme. I
am an EE but I do play with my HVAC systems and I have found the start/run
capacitor circuits to be a module that fails; at least, it has failed for
me. In my case, the kick start capacitor had started to leak causing a
different start up noise from the compressor. After all who but an engineer
listens to his HVAC compressor start and cringe every time he hears the kick
start capacitor kick the crap out of the compressor at start up. Maybe
temporarily removing the kick start kit which would pull the power from the
relay I think you are mentioning, which might be an investigative step. Of
course I am guessing at your specific situation which is made more difficult
since either you or my email program keeps inserting a question mark after
some character like quotation marks. Maybe Mr. Gates can explain this odd
blog email decoding outcome to me some day when I have even more time to
waste. I use Outlook BTW. Ken K5RG
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