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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.
Other furnaces have exterior access and can be serviced more easily. Removing the outside cover exposes the workings of the furnace, which is a big time-saver when doing maintenance or making repairs.
If the furnace fails to operate, the circuit-breaker switch is a good place to check for power. When working on the furnace, turn the power off first. It can be turned on and off as needed for advanced diagnostics.

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