Hi,
We have an intermittent problem with an Alpha CB24 combi boiler in that sometimes the boiler doesn't produce hot water.
We've had a plumber round a couple of times, when it's exhibited the fault, but Sod's law, by the time he comes, it starts working!
I've had a quick look on the forum and I found at least 2 posts where the DHW on this model of boiler was not working and the solution didn't seem conclusive, but was in the same general area.
When the DHW fails, you turn the hot tap on and the light B doesn't turn on and the boiler doesn't switch on/fire. If the Boiler is turned to continuous CH and the room thermostat tweaked to ensure the CH goes on, then eventually the DHW will come through.
From looking at the fault finding manual, case L page 32 (http://www.alpha-innovation.co.uk/c...s/CB24 28 Installation and Servicing Inst.pdf),
it seems to indicate four possible faulty parts (and their approximate costs from a quick google)-
PCB. ~£186
DHW switch ~£35
Diaphragm. ~£23
Diverter valve ~£156
The boiler is about 8 years old.
I have a multimeter so could probably do some measurement to eliminate PCB, but I'd not be happy swapping out any components and would prefer a gas-safe plumber to do it.
Any advice on which is most likely or suggested next steps?
We have an intermittent problem with an Alpha CB24 combi boiler in that sometimes the boiler doesn't produce hot water.
We've had a plumber round a couple of times, when it's exhibited the fault, but Sod's law, by the time he comes, it starts working!
I've had a quick look on the forum and I found at least 2 posts where the DHW on this model of boiler was not working and the solution didn't seem conclusive, but was in the same general area.
When the DHW fails, you turn the hot tap on and the light B doesn't turn on and the boiler doesn't switch on/fire. If the Boiler is turned to continuous CH and the room thermostat tweaked to ensure the CH goes on, then eventually the DHW will come through.
From looking at the fault finding manual, case L page 32 (http://www.alpha-innovation.co.uk/c...s/CB24 28 Installation and Servicing Inst.pdf),
it seems to indicate four possible faulty parts (and their approximate costs from a quick google)-
PCB. ~£186
DHW switch ~£35
Diaphragm. ~£23
Diverter valve ~£156
The boiler is about 8 years old.
I have a multimeter so could probably do some measurement to eliminate PCB, but I'd not be happy swapping out any components and would prefer a gas-safe plumber to do it.
Any advice on which is most likely or suggested next steps?