I have a Dometic Duo-Therm model no. 59516.531 AC. The fan runs slowly and the seems to run but doesn't cool because the fan doesn't run fast enough. Any help on where to start?

SOURCE: duo-therm by dometic ac rv unit

I suspect that you have a bad selector switch for the on, off, low fan, high fan operation. If the selector switch is put into the off position everything should stop completely.

SOURCE: Dometic Quick Cool Duo Therm Model 59516.601 runs

Hi; How old is the unit. Sometimes the condensing coils get clogged and need to be cleaned. Or the compressor is not in operation due to an electrical problem or the compressor is out due to a safety feature called a thermal overload. This protects the compressor from failure to a high heat or pressure situation. Alot of consumers run to the need freon theory before checking a few other things. Take Your time and be carefull .I You do not feel confident in Your trobbleshooting skills call a qualified tech...alpharome416...P.S. If You are going to take on this complex task please remove power before doing anything like removing covers or electrical panels!!!

Mike Butler

• 6674 Answers
• Posted on May 30, 2010

SOURCE: My Duo-therm Brisk-Air by Dometic rv ac wont cool.(The fan runs )

Usually just listening closely will give you a rough idea where to look for problem. When you have the fan on and switch to cool, (with temperature turned down low obviously) do you hear any type of "moaning" sounds from AC unit, or see lights in RV dim slightly indicating that compressor is trying to engage? Is the breaker tripping when compressor tries to engage? Do you hear a "click" from AC unit when switched to cool? If none of that happens, then I'd start thinking thermostat, or compressor relay. Normally if it's a faulty capacitor, the compressor will try to engage but will make a "moaning sound" and usually trip the breaker due to excess current draw. Someone experience in electrical should be able to test relays etc, but whoever does work on it, should be aware that those capacitors, as well as hydro in general are very dangerous to work with. The ("zap",- Shock) that you can experience from a capacitor or hydro, can be fatal.

SOURCE: Dometic Duo-Therm Model 57915.622 Fan will not start.

Hi, Sounds like your fan motor has gone bad...
Here is a tip about trouble shooting your air conditioner...

Air Conditioner Trouble -Review the Possibilities
http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

SOURCE: I have a Dometic P/N

It is probably low on refrigerant. You can only check this if you have a set of gauges. Otherwise, take it to an air cond company and they will check it for you.