Did you check the motorised valve isn't manually latched ?
Maybe there's just no demand from the cylinder stat? If the water has been heating unintentionally?
Did you check the motorised valve isn't manually latched ?
As I understood the boiler isnt firing up for either heating or hot waterMaybe there's no demand from the cylinder stat?
As I understood the boiler isnt firing up for either heating or hot water
Thats as maybe ,but since altering the switch at programmer from gravity to fully pumped the boiler is dead as I understandI think it has been most of the day, and heating both. Heating the water unintentionally.
Thats as maybe ,but since altering the switch at programmer from gravity to fully pumped the boiler is dead as I understand
It could be moved, but had resistence and would return back to its original position.Did you check the motorised valve isn't manually latched ?
Yep dead as a dodo.Thats as maybe ,but since altering the switch at programmer from gravity to fully pumped the boiler is dead as I understand
Strangely since switching to "P" the valve has returned to the heating only position.Oh, I see. I thought the OP had only tried it on hot water, but on reading it again, I can see you are correct.
It's not something I'd attempt to be honest.Are you capable of using a multimeter to check voltages present at the wiring centre ?
If not ,you are going to need a central heating engineer to visit.
The boiler did fire up... The radiators heated up too.That's not wired correctly for a Y plan set up with a 3 port valve ,there is no connection for Hot water being satisfied. Is there no thermostat on your hot water cylinder ?
When you tried hot water only this morning ,and valve was in W position ,I assume boiler didn't fire up ?
Edit...just seen pic of cylinder and it does have a thermostat fitted.
That would be my theory also.OR more likely to be that someone has messed up the wiring, realised their mistake and bodged it up in "G" mode at the programmer?
Just tried your suggest and nothing. Valve is still sitting at "M".That would be my theory also.
As per @terryplumb you are missing the hot water off connection from the programmer. However, there is also a second source for a hot water off signal and that's your cylinder thermostat.
View attachment 286337
With heating and hot water both set to 'on at the programmer, if you turn the cylinder thermostat to maximum, and the central heating room thermostat to maximum, the motorised valve should be in the mid position. Then, if you turn the cylinder thermostat down to its minimum position, you should hear a click from the thermostat and the valve should move to the heating only position. Does that happen?
No ,you can only manually latch it in mid position. It returns to domestic hot water only Port ,under its spring pressure, if no voltage is supplied to it.Just tried your suggest and nothing. Valve is still sitting at "M".
In the current state will the water be constantly heated whilst heating is on? Is that safe? Is there anyway to manually switch the valve to heating only mode?
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