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Cruisair SX7: no power past SMXll controller
July 6, 2012
4:44 pm
jeffsuwanee
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July 6, 2012
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I have a 1997 Cruisair sx7 a/c unit (one of three) on my sea ray 420ac cruiser. The unit has an SMXll controller. All three of these unts have been performing flawlessly since I bought the boat in January. This week the forward stateroom unit stopped working.

Symptoms: SMXll controllers lights up and all buttons and function lights are usable. There is no activity at all on the AC unit itself..no compressor, no fan...nothing.

What I've done:
1. Swapped out the smx keypad with another one on the boat...keypad checks out fine.
2. Changed out motherboard inside prologic box...still no activity at AC unit.
3. Put SMX in continuous mode to try to activate fan only....nothing, nada, ziltch.

Next steps????

Thanks in advance,
Jeff