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wvcraftsman · 05-29-2012, 08:53 PM

Hi Everyone. I have a coleman mach model 8333 rooftop ac. Last year when I parked it, the A/c worked fine. Now it won't work at all. The fan will come one, but the compressor won't kick on. It doesn't hum or act like it wants to start. I checked the voltage at the compressor when the tstat is turned to auto cool, but no voltage at all. I don't see a PTCR or a starting relay. Is there a picture somewhere of a PTCR? I don't have a clue what it looks like. I'm thinking maybe its the start capacitor, but not sure. Anyone have any ideas?

RV Wizard · 05-30-2012, 03:21 AM

Hello and

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The PTCR is the black device on top of the start capacitor (also black).
Capacitors associated with the Coleman Air conditioner. The black capacitor in front with the PTCR start device is the Start Capacitor. The alumunum one to the left is the Compressor run capacitor. The gray one on the right is the fan Capacitor. - He

wvcraftsman · 05-30-2012, 06:14 AM

Thanks Wizard! The fan and compressor photo looks like mine, but the capacitor photo does not. I only have two capacitors and there isn't a black device or anything on top of either of the capacitors. Maybe I need to get one.

jrd48 · 05-30-2012, 08:15 PM

I had a similar problem with the same model. Before you start throwing money at the problem remove the filter and reach up in there and unplug and replug the wiring connectors. Just something cheap to try first. Worked for me.