Note: Many customers use extremely long power cords that are undersized. If possible, hook up the RV just like it was when the problem occurred.
Make note of the wire size and length of wire. Compare it to the chart for wire sizing.
Checking fuses and if breakers are tripped
Removed the inside plastic air diffuser box to determine if power is reaching the unit. The junction box will now be exposed. Remove the cover from the junction box to gain access to the connection between the RV and the unit wires (FIG. 3). Check with a voltmeter for voltage at the connections.
USE CAUTION as 120 volts may be present.
If voltage is not present, the problem is in the coach wiring or breaker/fuse box