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Old 11-30-16, 05:28 AM   #3
Fathompin
Lurking Renovator
 
Join Date: Nov 2015
Location: Dayton Ohio
Posts: 9
Thanks: 1
Thanked 1 Time in 1 Post
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I learned quite a bit from this experience. Here is the resolution:

A little low on freon triggering FP1 (freeze protection). When I first received the unit, I had to add some freon to get it to start, but I was not using recommended superheat and subcooling to determine how much freon to add, rather I was shooting for the recommended suction and discharge pressures (because at the time I did not know a whole lot about superheat and subcooling). But with the freon a little low, my superheat was greater than 20 degrees (factory recommends 10-18). Thus, at start up after a long time idle, freon at the evaporator (start of water jacket for heat mode) was going below 32 degrees temperature for long enough (four minutes) to trigger freeze safety shut off. (Unfortunately I was not seeing this code set because I was shutting off the power and all I ever saw was a blinking LED, and I was ignoring FP1 because I thought it was a measurement of water temperature, however it is a freon measurement.) This FP1 sensor temperature gradually came up to a decent temperature during operation (40 degrees); however, when idle for longer than 20 hours FP1 took too long to come up to temperature so the unit would shut off after it sat unused.
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stevehull (11-30-16)