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Bad Circuit Board/Triac
June 22, 2011
7:01 am
Steve Pooler
Forum Posts: 1127
Member Since:
November 12, 2008
sp_UserOfflineSmall Offline

Hi Rob...Good description~

I show that "VHE" model unit being from 1994-1995...And having the original Passport control system...You can confirm that here /marine-ac-updates/marine-ac-control-identification-marine-air-direct-expansion-units/ by looking at the pictures....Look for the small penguin facing right on the face of the Passport display, but also look at the board in the next picture to confirm that you do have the original Passport...(It could have been upgraded by now)

Unfortunately Marine Air has no replacement parts for the original Passport (actually any control) and no longer offers that complete board either....They do still offer boards for the FX-1, ECU MAXX, Passport II, and the current Passport I/O.... 

There is a retrofit kit available to upgrade from Passport to the current Passport I/O control system...See page 9 of the Marine Air price book (Top of any page here by clicking on Marine Air prices) replacement boards for the controls I mentioned above are on page 22

Dometic frowns on me quoting discounted pricing in public, but you can either call, or e-mail me thru the "Contact Steve" link at the top of any page...


June 21, 2011
11:44 pm
Sacramento, CA
New Member
Forum Posts: 1
Member Since:
June 21, 2011
sp_UserOfflineSmall Offline

Hello Steve

I have a Marine Air Systems self contained Vector High Efficiency Series reverse cycle air conditioner Model # VHE16K-H. Attached to a ECU Passport control Panel.
The compressor and water pump stopped running. Upon investigation I discovered one of the components on the printed circuit board has failed. I believe it is the Compressor Triac. I'm only getting .2 volts output on the compressor lead to the relay.
So far I have removed the circuit board from the control panel and swapped it with my second unit to ensure the circuit board was the only problem. The unit appeared to run just fine with the swapped board and I noticed a melted/unsoldered connection on the old removed board. The component is a small white plastic "T" shape box labeled SCHRACK TD423005. There are more specs but probably not important at this point.
Is there a replacement component or replacement circuit board available? What is the best option for repair? It's getting hot in Sacramento, CA