Join Date: Jun 2008
Location: Corfe Mullen, Wimborne Dorset
My Motorhome: Pilote 740C Sensation
Thanked 134 Times in 117 Posts
I saw this on a different forum regarding the same problem:
"We have a brand new Ace Supreme Twinstar. First outing the water heater worked fine on both gas and electric. Over Easter the gas side worked, but the electric didn't. I tried all the actions suggested in the manual, but it would not work. Then I was told that if I started it on gas & electric, then turn off the gas supply, imitating running out of gas, then the red warning light would come on. Then after turning everything off, and letting the whole system reset for about ten mins, all would be fine. OK I thought it sounds bizarre, but I'll, try it. IT WORKED".
Another response was:
"The Truma Ultra-store has a self setting reset, if the heater has been switched on wthout water on 240v, then it will trip, isolate from mains, leave 5-10 mins, fill with water and retry"