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?
Truma Ultraflow smart switch 2nd Generation not activated by hot water taps
- Thread starter soledancer
- Start date
- Nov 16, 2015
- 12,265
- 4,446
- 40,935
The hot and cold water water pipes are at the same pressure , provided by the water pump. the issue may be a faulty surge arrester but again thats on the common output from the pump , the only difference being the hot water system has more volume. As you have seemed to eliminated a lot of the components, then I would change the pressure switch for the Whale inline type which is adjustable
Possibly something in/under the tap cartridge, I had a vector tap that ran really slowly, the pump would switch on and off, I took the tap apart and in the valley under the cartridge I found some black plastic bits, pulled them out and refitted tap, tap now working as it should. No idea where the plastic came from🤔
Thanks for your assessment. It might come to that, but I have a couple of ideas tot try first.
The problem persists also with the bathroom tap and shower, so I don't think it will be that.
I have had a response from Truma "It would depend on where in the water system that the pressure switch is, it needs to be after the water inlet but before it T's off to the heating system so would need to have the location checked".
That would mean it may have been installed incorrectly at Coachman. The photo shows where it is and the arrow shows where it should be according to Truma. Their answer does have logic, as the switch will react to the drop in water pressure from either side of the T junction. In it's present position it might only read a drop in cold water pressure. I'm going to give their suggestion a try when the parts arrive.
That would mean it may have been installed incorrectly at Coachman. The photo shows where it is and the arrow shows where it should be according to Truma. Their answer does have logic, as the switch will react to the drop in water pressure from either side of the T junction. In it's present position it might only read a drop in cold water pressure. I'm going to give their suggestion a try when the parts arrive.
Attachments
Well, i bought the parts and did the plumbing. It works. I can't imagine how the previous owner ever had any hot water as the pressure switch is also a non-return valve thereby ensuring the pressure drop in the hot tank never reached the pressure switch. May be that's why they sold? I would be interested to know if anyone else has the original configuration and similar problems? I can only guess that a different switch was there originally which somehow worked with that configuration.
Attachments
- Nov 16, 2015
- 12,265
- 4,446
- 40,935
Glad you got it sorted, my pressure switch is a different one. I will check as to where it is located.
Facebook
Twitter