Guys i need some advice again on my sanuier duval. The hot water has stopped working again.
The heating has not been working for a few weeks so i decided to drain down the system and add Sentinel 400. Now i am planning on leaving this in for 4 weeks.
When i refilled the system last monday, the central heating was working fine, all rads getting hot etc. The hot water was also working perfectly, and this is the first time both have worked so well in a long time. It worked well for 5 whole days.
However at the weekend i noticed i was getting no hot water from the taps. I'd get a bit of lukewarm for a few seconds and then the water would be cold.
Now i had the same problem last year. I removed the motor head from the diverter valve, and therefore had hot water all through summer. (however no heating).
I then put the motor head back on and got no hot water but hot rads.
So after advice on here, i removed the flow sensor switch, washed it out, put it back together, and then got hot water and hot rads (on the rare occasion i turnd the heating on over summer.)
However as the days got colder, the central heating would only work intermittently, some days all rads get hot, other days only the upstairs rads would get hot. However the hot water was working fine.
So last week i drained down, added sentinel 400. Everything worked fine for 5 days but now suddenly i get no hot wtaer, so the same problem i originally had.
What could be the cause? The heat exchanger has been desclaed twice so i know that can't be the problem.
Its either the cold water flow sensor, the motor head or the diverter valve.
Any advice will be greatly appreciated as i really want to get to the bottom of this once and for all.