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Dometic control did not control HVAC
Strange events
no function on dometic control would function
Reset dometic by holding top and bottom buttons turn on the on off switch
display showed FF
the fan and heat pump started to work but the AC units were blowing cold air not heat
Furnace would not bring on any of the three zones
Removed aquahot cover and can bring on all three zones y shorting to ground
question why control will not start zones
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2 Replies
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On my coleman you can only go 4 degrees at a time. If you try to go more than the 4 degrees it tries to turn on the gas heat. I don’t have gas heat so when it is cold I just move the setting by the 4 degrees.
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Check underneath wiring, When they removed your AC’s maybe they forgot to connect the Blue wire,That sends 12v to heat be it a furnace or Aqua Hot, It send 12v to heat source,a furnace it activates it on a older Aqua Hot the 12v goes to 3 cube relays that changes a 12v signal to a negative signal. After 2003 newer Aqua Hot units with control boards the 12v signal turns it on. You have a cube relay for each zone Bedroom/Bathroom/living room. Here is a Royale wiring schematic for your model and year. See 4 cube relays extra one for Bay Heat, Those cubes are right near Aqua Hot same compartment
Jeff and Lindsay
91 Marathon XL
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