Truma Ultraflow smart switch 2nd Generation not activated by hot water taps

[soledancer]

Hi. The only way I can get hot water is to turn the tap(s) very slowly from cold to hot, which is a pain. If I turn the hot tap on, or move quickly from cold to hot "Clunk" the pump goes off. I have checked the non return valve, changed the pump, cleaned the tap heads, drained the system for air-locks (Several times), changed the filter, but still the problem persists. The caravan is a Coachman VIP 460/2 2016. The pressure switch is non-adjustable, and I believe it was only installed a year ago. I suspect the difference in pressure between cold and hot is more than the pressure switch can cope with, but this doesn't explain why the hot taps fail to activate it when turned on first. Any ideas/answers welcome. Does anyone know if this switch is standard, or did previous owner upgrade from a manual?

 

[Hutch]

Hi. The only way I can get hot water is to turn the tap(s) very slowly from cold to hot, which is a pain. If I turn the hot tap on, or move quickly from cold to hot "Clunk" the pump goes off. I have checked the non return valve, changed the pump, cleaned the tap heads, drained the system for air-locks (Several times), changed the filter, but still the problem persists. The caravan is a Coachman VIP 460/2 2016. The pressure switch is non-adjustable, and I believe it was only installed a year ago. I suspect the difference in pressure between cold and hot is more than the pressure switch can cope with, but this doesn't explain why the hot taps fail to activate it when turned on first. Any ideas/answers welcome. Does anyone know if this switch is standard, or did previous owner upgrade from a manual?

My 2013 Coachman 560 VIP has the NON adjustable pressure switch.