Question about Friedrich QuietMaster Electronic SS12J30D Air Conditioner

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Our Quietmaster 's cooling works for a while and then doesn't.

Our Quietmaster blows the appropriate cold air when I turn it on, say at 10 in the eveneing. A few hours later, while the fam still operates, the cooling does not even when the temperature control is lowered well below room temp. Then a few hours later the cooling starts/cycles on again. Help!!

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  • Friedrich Master
  • 3,740 Answers

Remove the front cover and make sure the temp sensing wire is in place on the front of the evaporator coils. If it has fallen and is touching the evaporator plumbing the unit can preform as you described.

Also check for signs of icing / ice build up on the evaporator coils after the uint has run for a couple of hours. Ice build up will also cause this symptom. IF you do find that the unit is icing up that can be caused by:
1. A very dirty evaporator
2.. A clogged Air filter
3. Contaminated by internal plumbing debris / clogged freon passages
4. A blower Fan motor running to slow.
5. Freon Pressure and return lines touching together usually either on the side of the unit or just behind the center chassis air wall enroute to the compressor.
6. A corroded electronic control board.

As you can see above there are several things that can cause the symptom your described. It cetainly sounds as if you either have an icing problem or a control board problem.

The next time the symptom occurs... place the unit of fan only for at least 30 minutes and then see if you can switch it to cool, and actually have it cool. If it does cool properly after switching to fan only for 30 minutes you most likely have an icing problem.

Thanks for using FixYa.

Kelly

Posted on Jul 20, 2010

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