Question about Dometic Rooftop RV Air Conditioner

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I get F4 (Freeze control failure) on my Dometic Penguin A/C

It is plenty warm out (80's) and can not get the A/C to work all I get is a F4 (Freeze control failure) on the thermostat. Please help.

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  • Danny Clark
    Danny Clark May 11, 2010

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This is from the service manual:

16. SYSTEM RESET
a. Turn the ON/OFF switch to .OFF. position.
b. Simultaneously depress and hold the MODE and ZONE
push-buttons while turning the ON/OFF switch to .ON..
FF should appear in the LCD display until the MODE
and ZONE push-buttons are released.
c. When a dip switch is turned on or off after initial configu
ration, a system reset will need to be done before the
Comfort Control CenterTM will recognize the updated selection

Hope this helps

Posted on Mar 08, 2009

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Posted on Jan 02, 2017

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Unknown which freeze control you have.
http://waterheatertimer.org/pdf/PF1102M-freeze-control-manual.pdf

Usually the adjustment range is small for pool timer controls since pipes are made of plastic.

You can buy thermostat controls and convert them to freeze controls and give yourself wider range of temperatures.
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The freeze protection just quit qorking when it dropped to freezing i turned the dial to 45 and it still will not come on has been working non stop for about 4 days. i am in the dfw area


You can replaced the freeze control without buying entire timer:

Google: "Intermatic thermostat freeze control" to see cross selection of choices.
For example Smarthome sells PF1103 for $80: works for 120 or 240
http://www.smarthome.com/42699/Intermatic-PF1103M-120-240V-Freeze-Protection-Control-Timer-Mechanism/p.aspx

To prevent freezing right now, the pump should run full time, so pull trippers off the timer dial, and mover override lever to ON position. This will keep the pump running.
When the temperature rises, put trippers back on dial, and then order new part.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 06, 2011 | Intermatic Timer PF1202T Multi Circuit...

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I need only the thermostat part of unit pf1202t. Please advise plus price.


1) Smarthome sells for $80
Double check model numbers
http://www.smarthome.com/42699/Intermatic-PF1103M-120-240V-Freeze-Protection-Control-Timer-Mechanism/p.aspx

2) Google search for: Intermatic freeze protection thermostat

3) Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer.

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