Hi, Would appreciate some help Please
Have read many posts with a similar problem but nothing matches exactly.
Boiler is Alpha CB28
The pressure falls overnight leaving me with zero pressure in a morning so i top it up to the middle of the green band and the alternately flashing lights go out and the boiler springs into life.
The central heating works fine and the hot water works ok currently but last week the hot water would not work unless the boiler was firing so i ran baths and showered with the central heating on constant and the thermostat turned up high.
When the boiler cools the pressure drops and needs refilling.
I have checked the flow switch on the diverter valve and that is in good order. (The boiler came on when detached) Strangely since i replaced the flow switch the hot water has worked but the pressure still falls.
Put balloon over PRV and no water is collected although while checking the flow switch i turned the PRV and it worked fine. (water in the balloon)
There is no leak or at least no sign of a leak through the house and i am pretty sure one would have come to light by now if there was as i have been refilling the system for a week now.
When the hot water was intermittent i was thinking it was the diverter valve / diaphragm but now am swinging to the expansion vessel.
Any ideas ??????????????????? Thanks
Have read many posts with a similar problem but nothing matches exactly.
Boiler is Alpha CB28
The pressure falls overnight leaving me with zero pressure in a morning so i top it up to the middle of the green band and the alternately flashing lights go out and the boiler springs into life.
The central heating works fine and the hot water works ok currently but last week the hot water would not work unless the boiler was firing so i ran baths and showered with the central heating on constant and the thermostat turned up high.
When the boiler cools the pressure drops and needs refilling.
I have checked the flow switch on the diverter valve and that is in good order. (The boiler came on when detached) Strangely since i replaced the flow switch the hot water has worked but the pressure still falls.
Put balloon over PRV and no water is collected although while checking the flow switch i turned the PRV and it worked fine. (water in the balloon)
There is no leak or at least no sign of a leak through the house and i am pretty sure one would have come to light by now if there was as i have been refilling the system for a week now.
When the hot water was intermittent i was thinking it was the diverter valve / diaphragm but now am swinging to the expansion vessel.
Any ideas ??????????????????? Thanks
