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All RV air conditioners with ceiling plenums have a provision for removing the return-air grille and the filter for cleaning. Check the owner’s manual for specific procedures. Here, the grille in a Coleman-Mach unit is gently pried off.
From left to right, the furnace circuit board, fan cage, circuit-breaker reset switch, vent, gas valve and, behind that, the burner are all accessible when the outside cover is removed.
he LP-gas furnace takes in fresh air and discharges exhaust through the tube shown here. The tube pulls out, and the entire burner assembly behind it can then be removed for service. Only a certified RV technician should remove the burner and valve assembly.
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