Question about Friedrich QuietMaster Electronic SS12J30D Air Conditioner

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My blower inside my house will not come on. outside unit either

I can not get my blower to come on. It appears my thermostat is working. The outside unit will not come on either. thank you

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  • ghempe Jan 09, 2009

    Thank you very much. Should I try to go out and buy another thermostat before calling a professional to come out to my home? thanks again...

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  • Friedrich Master
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Initially, it doesn't sound like your thermostat is working.
If it has a setting to allow the blower (air mover) to be operated alone or continuously, try that.
Generally, if the inside unit (air mover) won't power up, the outside unit will not turn on for more than a couple of minutes because if the inside unit isn't working, pressure builds up in the lines going to the outside unit and an over-pressure sensor will shut it down again.  

Posted on Jan 09, 2009

  • Steve Allison
    Steve Allison Jan 09, 2009

    From my previous response:


    If it has a setting to allow the blower (air mover) to be operated alone or continuously, try that. 



    Does it have any manual fan control and if it does, did you try it?


    I'm not certain the thermostat is at fault but if you can turn the fan on from it, that eliminates other possibilities such as:


    - Breaker on electrical panel kicked off?
    - Breaker on outside unit kicked off?


    And most outside units will have a separate ON-OFF switch and possibly fuses in the same box.


    Those are things for which a cheap digital multimeter can be used.
    Those are to be had at electronic or auto parts stores for under $20 US.
    With that some measurements can be made to hone in on the problem area.


    If you are not a willing DIYer, then I suggest you check your local Better Business Bureau website for a reputable service company; there are a bunch of 'oh yeah, I do that too'  (like me) and some of them may not be very honest. 



    Those are just two things that could be wrong that don't include a thermostat failure.. 

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Y = Yellow Cool
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4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
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W = White Heat
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And one for outdoor unit
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Y = Yellow Cool (outside transformer)
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W = White Heat (inside transformer)
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Y = Yellow Cool
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G = Green Blower
Y = Yellow Cool
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And one for outdoor unit
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G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
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W = White Heat (inside transformer)
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1 Answer

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