Hi Dan~

Guess you have more than one problem here…"Could have" should be inserted in that sentence though   and it's time to get out a meter for testing…

First the pump:

We need to determine if either of the A/C units is sending out power to the pump relay with both A/C units off…If one or both are…Then the pump problem is likely in the A/C units board that is sending out power to the pump relay…

If neither unit is sending out power to the pump relay…Then the pump relay is bad & will need to be replaced.

As far as the 16K unit blinking the cool light…Can't say I can remember seeing that…I would first check in the program mode to see if the control somehow got set for Heat only operation, or maybe Electric heat operation instead of Reverse Cycle heat…These are 2 differing settings…I can't say what they are without knowing if you have the ECU, or Passport control…But hopefully you have your manual which will tell you how to check both…

Please pay special attention to if one or both compressors run with the control/s in the off mode…This could cause the pump problem, and also cause a compressor failure if the compressor is running without the fan (and you didn't know it)

Steve~

bpidan said:

Okay, now I am getting somewhere.  I checked the Program mode U1 and U11 for their mode.  Both are set for 0, so that eliminates that.  My manual says it is a Vector Series Self Contained Units ECU Passport so I am confused about ECU or Passport…This link can help you identify your control & board: http://marine-ac.com/marine-ac…..ion-units/

I did manage to isolate the problem to the 16kh unit.  I turned off all 3 switches at the panel.  When I turned on the Pump Relay (with both units still off) it did not start. I then turned on the 9k unit and the pump started just like it should.  Once the compressor kicked on, the pump started.  When the compressor shut down, so did the pump.

When I then switched on the 16k unit (at the panel), pump started immediately with the control in the off position.

As to whether the compressor is running without the fan, I cannot tell.  It may have previously but now it may be in failure.

I am guessing that at this point, the problem is in the AC unit board sending out power to the Pump relay.    How do
I test the board and where can I get one?…This is where a multimeter is helpful…I would check for voltage at both the compressor & pump terminals on the board…Not that it will matter much because Marine Air no longer offers replacement boards for either the ECU or original Passport, and this is also where you need to be sure that the compressor will run & actually pump…It's also why I asked about it running without fan which will damage the compressor if it does run that way for long…(and it could very well have with a bad board)

The retrofit kit for your control to the newest Passport I/O control retails for $565.00…

A compressor is around $700… Plus labor, Refrigerant, Drier etc…

To do all of that, you would be better off to buy a complete new Turbo unit & control instead…It will perform better than that unit ever did, do it with less power, and also has the "Green" refrigerant of the future…

I can sell you what ever it is that you decide on at discounted pricing, but my discount schedule is better on units than parts…

 

Steve~