Had water leak in my storage area coming from behind the shower stall above. Water was running onto the control board for the heater, making the heater fan run constantly. WOW!
Turned off the water to the trailer. Found a switch on the heater control board which turned off the fan.
Turns out there were 4 pex lines running up into the cavity in the corner of the shower stall. Two were for hot and cold to the shower faucet. The other two were running from the black tank flush hose connector up into the cavity and back down to the black tank. At the top of those lines was an atmospheric shut off valve which was designed to keep black water from backing up to the tank flush hose connector. Found out it was placed there because that valve needed to be 3 ft above the black tank. Vibration had broken that line.
Not saying that is your problem but if you have more than two water lines running from the storage area up to the shower faucets it might be worth a check.
2011 Coleman Signature Series CTF340RL 5th wheel by Dutchman
2007 Dodge RAM 3500 Cummings diesel (5.9L)
Formerly 2006 Crossroads Paradise Point fall apart queen.