AC (Air Condition) Problem

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walterv

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I have a 2004 34C Silverton with a Cruise Air AC with SMX controller. If I set the SMX controller for a temp, in the heat mode, it just continues to run. I am thinking a thermostat problem (Controller?).
This may also happen in the cool mode, but it is not hot enough here to test that.

Any ideas on where to start, look, or test?

This happened today, I set the controller for 73, back in the boat 20 minutes later, the boat was 83 degrees. Same thing happened last week, I thought it was a glitch, reason being is I booted the system down, set a temperature, and for the short period of time it seemed to work.

After today, I am sure I have a problem and it was not a glitch.
 
Walter, not sure about yours but I had a similiar problem last weekend. The heat would not cycle off and I could not get the ac to run at all. I had to turn it off pull out the book and found that I had it locked in heat mode. There was a way to reset the controller with the unit off to an automatic mode. I dont know how it got there but once I reset it it worked fine.
 
I am not familiar with the cruise air but if you can easily remove the control panel exchange it with another one from the other AC and see if the problem follows the controller. Some ACs have a high current relay board in a high power box in addition to the low voltage controller with the dials and readouts. It too may fail so you want to figure out where the problem is located. Sounds like the third component, the compressor, is working OK
 
Walter, did yo try to re-set the unit to the default settings? Works for me when I get the thing good and screwed up.
 
Before and after trying the re-set Walter I had developed all kinds of strange problems with My MarineAir 16k BTU unit with the digital Elite control in the salon. It ended up be a symptom not the problem my main AC breaker for the leg that unit was on was almost melted, in other words it had seen better days. I replaced both 30 amp main AC panel breakers and now the AC/Heat unit works as it should. This really shouldn't be your problem because your boat is considerably younger than my boat. It could also be the temperature sensor. It really kind of made sense the AC/Heat unit draws the most amount of AC current per leg on my boat.
Bill
 
Walt, Kill power to the ac unit at the break for 30 sec. Then restart. The actual thermostat is just a displat and control. Everyting is controlled at the board in the white panel remotely mounted from the a/c unit. Try it again and let me know what happens .

Rob
 
Try a full reset. Unfortunately it will set your controller to factory defaults which includes the fan running on lowest low all the time. If you want the full manual I can email it to you, just drop me an email.

Here is the reset.

Use Factory Memory Reset to restore all programmed
functions to the factory default settings.
To restore programmed functions to the default factory
settings:
• Press the Off, Set and Fan keys simultaneously.
• Press the Set key.
• After a delay, the memory will be reset from stored values.
After another delay, the display will come back on normally
 
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