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Compressor is running hot
November 12, 2011
12:47 pm
Steve Pooler
Forum Posts: 1127
Member Since:
November 12, 2008
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Hi Bud~


I'm showing the "VHE" units as being produced 1994-1995 and having the Passport control with a small penguin just to the right of Airrrrr....Not the Passport II which did not come out till 1996...

It does make a difference, and with the Passport...Three dashes means High Pressure switch shutdown...

High Pressure in heat usually means lack of air flow...IE: Slow fan, or restricted ductwork...It can also be from high cabin temp, or a leaking duct causing the hot air discharge to leak back into the return...

Duct size is critical...Especially in the heat mode because you are now removing the heat from the refrigerant with the cabin blower instead of with the seawater as is done in the cooling mode...

Though it is normal for a compressor to run hotter in the heat mode without any of the above mentioned possibilities....It is compounded by working very hard (and drawing more amperage) against that higher pressure that may occur from any of the above...

To help more than that I would need to know duct sizes etc...

Here is a link to another similar thread with pictures so that you might know where this leads, and can answer me back with the kind of info I can help you with...  Cool  /forum/troubleshooting/marine-air-cm16h/



November 12, 2011
11:12 am
Sassafras Bud
New Member
Forum Posts: 1
Member Since:
November 12, 2011
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Hi, I have a Hunter 43 ft sailboat sitting in the Washington DC area. It was cold this morning and we put the main salon 16000 BTU reverse cycle Marine Airr System Model VHE16K-H (Passpor II) on. In two hours, there was a faint heat-burn-electrical smell. When we pulled the access area open under the seatee the compressor was hot to the touch, but I was able to touch it.  We checjked for water pump obstructions  (seacock and water strainer) and there were no obstructions. We turned the unit off-the digital control displayed 3 dash lines at the time we turned the unit off.  I suspect that the temperature differential between what was set on the digital control (72 degrees) was more than 12 degree difference with the temperature in the air. My question is:  what would cause the compressor to over heat and have a electrical-heat smell to it?  Is there something I need to assess or mointor to diagnosis a potential problem with the compressor?  Sassafras Bud