Re: I get F4 (Freeze control failure) on my Dometic...
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
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You know what, I have never ran into that yet in 15 years, so I think your best bet would be to go to, (dometicusa.com) and send then a quick inquiry to confirm, what would be required, they are usually pretty helpful believe it or not.
I would check to make sure that the control is sending the "cool" signal to the control unit. LO on the room temp display usually means that the fan speed is set to low. Is LO and Auto showing on the display at the same time. Try resetting the thermostat first. Hold down the Mode and Zone buttons with the tstat off. While holding them down, turn the tstat back on and hold the buttons down until FF appears on the screen. Release the buttons and try the AC. If this does not work, on the control board is a freeze control switch plug (blue usually). Try unplugging this unit and insert a small jumper wire. If the Compressor comes on and runs then you have a bad freeze control switch. If not, then you should replace the control board.