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Old 09-19-15, 02:49 PM   #17
mechanic
Apprentice EcoRenovator
 
Join Date: Aug 2014
Location: Saskatchewan, Canada
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Cooling mode hasn't been running much lately but we've finally had some hot weather and I did some checking so:
-the compressor discharge is almost too hot to touch
-if there is a temp difference in the hot water lines it's very slight
-there is power to the circulating pump, it's very hot, as hot as the discharge line, but the water line is room temperature
-the water line is hot for about 10" from the heat exchanger, then goes to room temp

So everything basically points to a seized circulating pump I would say, right? But I know this is not the case because it has never worked in cooling mode and it always works in heating mode. But like stevehull said the heat exchanger is the first thing after the discharge, before the reversing valve, I followed all the lines, it's pretty drop dead simple...

I guess I could depressurize my water system, cut the pex lines and put some temporary lines into a bucket, turn it on and see what happens... Maybe the pump is air locking somehow? Not sure how cause it should pump just the same as in heat mode...
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