Hi my mum had a boiler fitted by some government grant for pensioners about two years ago and the boiler fitted was an Isar combi. The general consensus is that this isn't a great boiler. The thing now just keeps flashing L/F(flame detection error)!!. Is there anything obvious I should try before calling out the plumbers? Any advice would be appreciated.

Andystuart, September 2008

its an he 30 isar boiler is there anything I can do its saying l and f thanx

david johnson, January 2015

Dave thanks for the advice. Just had the same problem with my Isar combi boiler, after looking at the siphon trap found this to be blocked, cleaned it out and fingers crossed appears to be working now.

Charlie, April 2009

Hi,
I have an Isar HE30 COMBI boiler. I had it fitted about 4 years ago. I have just had the same thing go wrong with mine. I got up one morning and L-F was flashing. As a woman on my own, I didn't know what to do so I switched the whole thing off at the socket. Left if for about 10 mins, and switched it on again. It worked - and touch wood the boiler is ok so far. It had been very windy, and I am not sure if that had anything to do with it. Hope this is of some use.

Wendy Holmes, January 2009

Thanks Dave.
I'll give that a look.

Regards,

Andystuart

andy Stuart, October 2008

Check the siphon trap under the boiler isn't blocked or as most faults on these if there is a black pcb it needs changing for the current red pcb

dave, September 2008