Might check in your engine compartment to see if there is a shut off valve on the coolant line going to the front of the coach???
Not sure you have the same floor heat as mine but I had similar issue when we got the coach. I have two T stats, one for rear and one for front of coach. I had heat in rear but none in front. Breaker on, t-stats would illuminate but no heat.
I removed the front T stat and found the wire nut had come off the bundle of neutral wires and wires had separated. Fixed that and have had great heat for past 5 years.
You do have to have the Webasto on to get heat in your wet bay.
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA