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hdougj's avatar
hdougj
Explorer
Nov 07, 2015

Duo-Therm A/C Clicking - Will not turn on

Hello,

I have a roof mounted A/C with wall mounted thermostat. It is a Dometic Duo-Therm unit. When I flip the thermostat to A/C, I can hear it click in the A/C but nothing happens. I can get the furnace to click on from the thermostat which leads me to believe it is something wrong with the A/C it self.

I have taken the cover off of the A/C unit and the fuse is good. Just when I flip the thermostat to A/C it clicks and nothing happens.

Anyone have any insight or familiar with these units?
Class A

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  • Teacher_s_Pet's avatar
    Teacher_s_Pet
    Explorer
    Nov 07, 2015
    Haven't had a Duo-Therm for years, but is there a black canister (starting capacitor) about 4" long with 4 spade connections? If so look at the 1/4"-5/16" hole close to the spade connections that has what looks like wax paper inside it. If it shows evidence of the paper bursting, the capacitor is bad and will need to be replaced.

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