Hello there, our 21' BF trailer has a hot water system that works but the supply of hot is intermittent with colder water, alternating every few seconds. It seems that it may be triggered as the water pump kicks in. Do any of you RV vet's know what the cause of this issue may be?
Check where the water lines exit & enter the hot water heater. Make sure that the bypass levers are parallel to the lowest line (Cold water) entering the waterheater & the upper line that is exiting the water heater is the (Hot Water) line. Sometimes there is a bypass line between these two lines, THIS LEVER SHOULD BE ACROSS THE LINE NOT PARALLEL.