Rooftop AC Unit

drewmaz · 06-04-2018, 08:28 AM

It suddenly seems like our rooftop AC unit has no power. It worked fine a previous weekend and this weekend there is nothing. Not even in fan or any other mode.
The camper has been setup at a seasonal site, so there were no takedown/setup changes.
I did check and reset the fuses and breakers under the shower and they all look OK. I took down the inside cover to check the wiring and from what I can tell, that is all OK too. Still no luck.

Am I missing some other fuses or things I need to check?
Thanks

**Bill** · 06-04-2018, 01:05 PM

When the thing stopped working, was there any detectable smell (stink, actually) coming from it?

When you turn the knob to one of the fan-only positions, does the fan come on and start to blow?

When you turn the knob to one of the cool positions, can you hear a hum? Or a rumble?

In other words, give us more symptoms.

Bill

drewmaz · 06-04-2018, 06:49 PM

No smell at all. No nothing. I didn't hear any noise at all but I will go back and literally put my ear to it to see if there was any humming.
No fan, no AC, no heat. Nada. I suspect something electrical feeding the unit.

**Bill** · 06-04-2018, 07:36 PM

Quote:

I did check and reset the ... breakers under the shower ...

When you checked the circuit breakers, did you actually snap each one OFF and then ON again? A popped breaker can be hard to spot by eye, and if it is popped, simply pushing it toward ON won't reset it.

Quote:

Originally Posted by drewmaz

I didn't hear any noise at all but I will go back and literally put my ear to it to see if there was any humming.

No need. The hum would be fairly loud.

Quote:

I suspect something electrical feeding the unit.

Sounds like you are right. Do you have (or can you get) a non-contact voltage sensor? A handy tool - Amazon has a number of them for less than $10. Anyway, this would permit you to drop the inside cover and nose around inside the AC. With the switch in any position except OFF, you should find that several wires are live. If you find none, then it is probably an electrical supply problem, as you thought.

Bill

Shane826 · 06-05-2018, 12:21 PM

Do your 110AC outlets work? How about the microwave (if you have one)? A couple things to check if you have no AC power at all would be the heating element in the water heater (was it left on with no water in the tank?) or check the utility pole and make sure you have power there.