I've got an Alpha CB28 boiler and it has been playing up over recent weeks.
The first problem that it would cut out giving a red flashing light error. I'd reset it, and it would work fine for a while, providing hot water. I've not really worked out when or what causes it to trip over, as the boiler is in the loft, so I'm not going to sit up there all day waiting for it to fail. But it does occur a few times a day.
Now that the weather is turned I've now noticed the central heating isn't coming on. To remove any doubts about the thermostat I've bypassed that, so linking pins 1 & 2 on the input. So the heating should come on, but it doesn't. The orange LED blinks every 5 seconds as it should when happily resting, but the boiler isn't firing up to start the heating. It fires up for hot water fine when a tap is turned on though.
Over the past few years I've replaced the control board (due to some dry joints and worn out relays), the DHW switch, and the diaphragm.
Any clues to what I can check to narrow down the fault would be most helpful.
The first problem that it would cut out giving a red flashing light error. I'd reset it, and it would work fine for a while, providing hot water. I've not really worked out when or what causes it to trip over, as the boiler is in the loft, so I'm not going to sit up there all day waiting for it to fail. But it does occur a few times a day.
Now that the weather is turned I've now noticed the central heating isn't coming on. To remove any doubts about the thermostat I've bypassed that, so linking pins 1 & 2 on the input. So the heating should come on, but it doesn't. The orange LED blinks every 5 seconds as it should when happily resting, but the boiler isn't firing up to start the heating. It fires up for hot water fine when a tap is turned on though.
Over the past few years I've replaced the control board (due to some dry joints and worn out relays), the DHW switch, and the diaphragm.
Any clues to what I can check to narrow down the fault would be most helpful.
