Question about Friedrich Digital PTAC PDH12K35B Central Air Conditioner

2 Answers

PTAC PDE12K3SB - No Heat

Determined that there is 220 power to the unit but no heat - heating coil looks good - could be problem with control pad relay

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  • MrGFixit Dec 25, 2007

    Thanks for the info. What does the switch look like? Is there a site that supplies a diagram?

    Is was told the control boards are blowing out in these units and causing a relay to fail.

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If the unit will come on in heat mode but won't blow hot air, check the Hi-limit switch and heating element. They are located between the evaporator coil and blower wheel and can be serviced by removing the front cover, sliding the unit out slightly, and then removing the blower cover on the top of the unit.
Post back if you have any questions.
Thanks/Mike

Posted on Dec 18, 2007

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  • Michael  Lindley
    Michael Lindley Dec 18, 2007

    If you need professional repair or parts go to friedrich.com and find a servicer near you or, Sears Repair ( 1-800-469-4663 ) and A&E Factory Services ( 1-800-905-9505 ) also service these units nationwide.

    Thanks/Mike

  • Michael  Lindley
    Michael Lindley Dec 21, 2007

    mrgfixit

    Just wanted to follow up and see what you have found out.

    Thanks/Mike

  • Michael  Lindley
    Michael Lindley Dec 25, 2007

    I have not had any unusually high failures with the boards myself, but it is easy enough to check. Remove the heater assembly and attach your meter leads to the wires going to the heater element, making sure they won't ground out or get in the blower. Plug the unit back in and turn on the heat. If you get 220V, the board and relay are ok. There are 2 limit switches mounted to the heater assembly bracket. Both these should read closed when you check them for continuity with your meter, as should your heater. The limit switches are black plastic with metal bottoms pointing toward the element.

    I don't know of a good place on the web to direct you to a picture. You can go to sears.com, click on parts, enter your model number and view a parts breakdown and parts list. It is not very detailed and many of the parts are listed but not illustrated.

    I will see if I have anything on disc that I might be able to post on here.

    Thanks/Mike

  • Michael  Lindley
    Michael Lindley Dec 27, 2007

    I don't have anything that I can post on this site, sorry. Were you able to check power to the element?

    Since you have not rated either of the solutions, the first one has been credited with solving your problem.

    Thanks/Mike

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I think so may be the heating coils are not getting heat without power supply check out the plug in wire and whole supply.

Posted on Dec 18, 2007

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http://www.wilmar.com/

CENTURY Maintenance Supply , 1-800-880-3416

Johnstone Supply, 1-800-493-4822

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