If the "check light" is flashing then we need to check the condition of the battery(s). Dometic refers will operate at lower than 12VDC but not a lot lower. Check the voltage AT THE REFER. You can do that by removing the lower access panel and look for the 12V wires, they will be attached at a plastic connection with screws that hold the wire. If you have 12V then its time start tracing the wire. The positive wire will go through a couple of "safety's" before it will start cooling. Check for voltage and post back for further instructions.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.