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Old 02-16-2021, 03:30 PM   #2
pneumatics
Senior Member
 
Brand: Thor Motor Coach
Model: Miramar 35.3
State: Pennsylvania
Posts: 211
THOR #20808
I'd start with the monitor panel.

Typically the switches for generators, slides, water heaters both electric & gas are sourced from the appliance itself and do not get connected to 12VDC source inside the monitor panel. Hence they work as long as the appliance works.

Monitor LED's, pumps, etc. that need 12VDC power to run need a source. If you pull out the panel you may discover a loose wire on the back. These can be a pain to troubleshoot sometimes.

Look for a relay somewhere in the pump circuit also, these are a small black cube with wires and are used where the switch on the control panel (or multiple switches to control the pump) are too small for the amperage of the pump. I've had loose wires on them and a bad one years ago. Location? Good luck could be buried in a harness somewhere.

Never had a bad pressure switch on a pump always a first time.

Good luck
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