Having an annoying intermittent fault on my 2004 Turbomax Plus 824e. It's started locking out with F28 code on average once a day. Some days it doesn't do it, but most days it just does it once. Usually after it's been used for hot water first thing in the morning. I re-set it, then it's OK for the rest of the day.
Recently, we had a problem with the hot water going hot and cold. So, I changed the plate heat exchanger and fitted a Magnaclean on the return. Hot water performance is now good as new. The F28 fault started a few weeks after this work, so not sure if there is any connection. Boiler pressure is just above 1 bar cold.
I'm aware that it's likely to be a gas or ignition problem. Would be grateful if anyone with experience of this problem/boiler, particularly when it's only intermittent, can tell me what to check for.
Many thanks.
Recently, we had a problem with the hot water going hot and cold. So, I changed the plate heat exchanger and fitted a Magnaclean on the return. Hot water performance is now good as new. The F28 fault started a few weeks after this work, so not sure if there is any connection. Boiler pressure is just above 1 bar cold.
I'm aware that it's likely to be a gas or ignition problem. Would be grateful if anyone with experience of this problem/boiler, particularly when it's only intermittent, can tell me what to check for.
Many thanks.