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Hi all, just to give an update - another gas engineer came twice over the last 2 days to have a look. The first time the boiler happened to work fine, the second time the boiler wasn't responding, but as he cover was taken off, it sprung to life, before switching off again a few minutes later...

Thanks for your responses both. The boiler is an Ideal FF350. Both motorised valves are opening and closing without issue, and as far as I can see there are no loose wires. It can be working fine one part of the day and then playing up later on - that's how intermittent it can be, and how...

I have a s-plan heating system with an unvented cylinder, and a fairly old (20 year old) boiler. Recently I've noticed that sometimes when the thermostat calls for heat, the boiler will not fire up. The usual click will be heard, and the pump will start running, but no more than that. After a...

After switching off the mains today, turning it back on brought the tamper alarm on, but the usual code didn't work to reset it. Bringing it into engineer mode didn't work either. So the only way to quieten the alarm is to switch off the mains again, and wait for the quieter, high-pitch alarm...

Thanks for your replies. In that case, the engineer may not be 100% correct in saying that only after fitting a new gas valve (and then not being able to return it) would he be able to deduct whether it was that or the PCB?

The boiler is filling up the unvented cylinder with hot water as it should but the hot taps and showers have increased in pressure and only release cold water (maybe a dash of hot water blended in). Intriguingly, when a particular hot tap that is near to the tank is opened (I haven't tested yet...

My boiler - a 15 year old Ideal FF350 - has been starting to play up: When it starts up the pilot light will ignite with a loud click, then take a long time to start the main burners, before switching off after 90 seconds or so. After another 90 seconds the sequence will start again and again...