A/C not Cooling 2004 Itasca Sunrise

[ipoverord]

Good Morning everyone!


I have a 2004 Itasca Sunrise with a heatpump/AC unit. There was a DC electrical event that took out the fuseable link and the starter. After that, (maybe related, maybe not) the ac no longer works. There is a line that freezes near the compressor. The coils do not freeze, just the line. I have cleaned both coils, but they were not really all that dirty to begin with. Any ideas where I should look. My hope is there is a dc fuse somewhere but I dont' think dc has anything to do with it. Any suggestions are appreciated. Thanks for you input!..


Scott G.

[Ray,IN]

Thermostat controls are 12V. Some A/C units have a 12V module inside that powers the A/C and furnace controls.
What is the make and model of your A/C unit? Is the fan motor(some have 2) running?

[ipoverord]

Thank you for your input.
The AC is Colem Mach oh the Roof unit and Thermostat say the same thing. would it be helpful for me to pull the cover for for specifics?

[ipoverord]

The fan blows and it sounds like the compressor is running. I just tested and it also appears the heatpump does not work. I tried electric heat and it is the same as AC. Checked the fuse in the thermostat and it seems fine. I am attaching pictures of what it looks like on the outside.

[creativepart]

There is a control board inside the A/C inside the RV. Take off the inside trim around the A/C in your interior ceiling and you should see a box with electrical connections up in the unit. It could a board in there that was effected by the DC “event.”

Or, it could be a coincidence that your 19-yr old A/C decided to go out at the same time as your other problems. It wouldn’t be the first time.

[ipoverord]

Is this it? Is there a fuse I can replace or would you suspect the whole board. And I agree could just be a really old AC.



Also, Thank you for taking the time to engage in this discussion. I really appreciate your input.

[creativepart]

That's it. I have no idea what's inside, I just know that it has yellow wires going in to it and yellow wires are 12v+ wires in Winnebago world.

The thermostat connects there usually.

I know nothing more than that. Fuses?? I doubt it, but don't know. A circuit board that could have blown? You'll have to look.

I've had trouble with Coleman-Mach A/Cs lasting 4 years reliably - my RV is 6 years old and I'm on my 3rd counting the OEM unit. So, to me if your's has lasted 19 years you are doing really well compared to me.

[ipoverord]

Thank you . I will investigate. Sounds like buying a new one may not be a good call with the issues you have faced. I'll look at a board and see what it costs.

[creativepart]

Originally Posted by ipoverord

I'll look at a board and see what it costs.

Throwing parts at it can be expensive folly. Do, they even still have a circuit board for an old A/C unit?

Rooftop A/C units, I'm sorry to say, are considered disposable, not repairable.

Before buying a circuit board I'd at least check the start/run capacitors, have a tech check amperage on start up, etc. Coleman-Mach publishes exact amp ranges that will indicate a broken A/C to a tech.

My issues are luck of the draw. I have two A/Cs on my roof and only one has had issues.

[ipoverord]

I looked up the board and lt looks like there is a 5 amp dc fuse. I will check that and maybe get lucky. Then find an ac guy before doing any investments. Thanks again. I’ll let you know what I find

[dickb46]

I'm missing the part about resetting the a/c breaker.

[Ray,IN]

Originally Posted by dickb46

I'm missing the part about resetting the a/c breaker.

Post 4 he said it runs.