There are many postings here about how to resolve this problem when camping at high altitudes. If this is happening at lower altitudes, then you might very well have a problem with the circuit card that is in the heater itself. Suburban heaters are known to burn out the control cards early in life and there is a very much improved replacement offered thru a different manufacturer. If your heater is tied into a Dometic loop circuit that is tied into the AC units, then a safe bet would be to isolate your heater completely by rewiring the controls and installing a separate independent thermostat to control the heater independently from the rest of the Dometic equipment.
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Alan
2012 Ram 3500 DRW Crew Cab, 6.7 HO Cummins
2014 Columbus M-340RK
'69 Chevy C-10, 396BB
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