Roof A/C

[LOFAT36]

My roof a/c worked fine on my trailer up until about a month ago. Now when I turn it on it runs constantly no matter where I set the thermostat. Also, before it went on the fritz condensationused to drip off the roof. No longer. Any ideas ?

[wa8yxm]

The lack of condensation suggests the Compressor is not Compressing or another issue with the cooling system.

NOTE: one BIG issue is the evaporator.. Last spring I parked in the area of Cottenwoods.. and very quickly my ACs failed. a quick trip topside and a bit of cleanign and they were 100 (actually 111% but that's a much longer story) percent again

Cotton wood "Cotton" is not the only condenser clogger.

But Running constantly suggests FAN MODE is set to High/Low (If the compressor is not running) Which is how I set my A/Cs for noise reasons.

Or a short on a T-Stat line (not likely but not impossible)

[LOFAT36]

Thermostat ? Seems to work fine for the furnace.

[Chris_Bryant]

You just need to systematically troubleshoot. It's either the thermostat or control board, but we need a make, model and type of thermostat to give any meaningful help.

[jerryjay11]

Is the camper cooling down to set temperature? If not there is a chance the cooling coil is frosted up due to being dirty or dirty air filter. The air could feel relatively cold, but you may feel reduced airflow.

[drsteve]

LOFAT36 wrote:
It is blowing cold but will not shut down.

Sounds like the A/C itself is fine. I would suspect the thermostat.

[LOFAT36]

It is blowing cold but will not shut down.

[MFL]

Does it blow cold, compressor running, or just room temp, fan running.

Jerry

[drsteve]

Does the compressor try to start?