Ideal Logic Boiler F2/L2 Fault

BennyC

BennyC

BennyC

Soldato
Joined
25 Sep 2006
Posts
14,415
Afternoon,

I have British Gas currently working to remedy this fault but thought I would consult some of the knowledge on the forum as a solution seems to be illusive at the moment.

The boiler has been fine for just shy of 6 years (from new) until a few weeks ago the 'F2' (Flame Loss) fault was showing. I have a Homecare policy for convenience so called them out for a visit to investigate. After switching the boiler off for a while and allowing things to dissipate it would fire and function fine for a short while before locking out to 'F2' again.

A few new parts were fitted including the condensing trump/sump (which had a slight crack) and my Annual Service completed but success was short lived. They have since revisited again, checked electrodes, the condensing pipe and drain itself and confirmed everything is A-ok. I have no slow flowing drains for that matter in the house, no gargling noises or bubbles coming from the boiler either and to our knowledge no air-block in the condensing pipe.

Having back-filled through the flue the condensing trap does drain but there is a delay/slow causing the F2 fault and/or the L2 fault (Flame Loss).They are re attending tomorrow with another new condensing trap/sump and new electrodes to be thorough.

I have thought of asking to try by-passing the existing condensing pipe and just run something temporary in to the adjacent sink, to guarantee flow is not restricted upon exiting the boiler assembly, but this isn’t an area of expertise for me.

I don't expect the engineers to be a walking encyclopedia for all boilers but if anyone has any suggestions I could share that might help pin-point the issue I'd be grateful, especially as a cold snap has arrived :)

Thanks,

BennyC
 
FlyingFish said:
I've replaced a few spark generators on these. Also lots of leaking traps and sump doors. I did come across one of a similar age to yours that was very sensitive to needing a clean primary heat exchanger when fitted to several meters of flue pipe. Otherwise initial ignition wasn't very clean.

I'm sure BG will sort it eventually
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Thank you, I will run these suggestions past them if they have no joy tomorrow :) works perfectly, when not tripping itself out :p
 
FlyingFish said:
I've replaced a few spark generators on these. Also lots of leaking traps and sump doors. I did come across one of a similar age to yours that was very sensitive to needing a clean primary heat exchanger when fitted to several meters of flue pipe. Otherwise initial ignition wasn't very clean.

I'm sure BG will sort it eventually
Click to expand...

This evening's visit appeared to be fruitful but hasn't yielded any lasting function. 30 minutes or so and the F2/L2 "Flame Loss" lockout shows.

I've watched it during a firing cycle, the pilot light remains on the first attempt, doesn't struggle at all and it heats perfectly fine. The condensing trap empties successfully too but then after 10 minutes or so it locks out again, even if the trap has just emptied.

What else could cause flame loss? :( It seems to need time for things to dissipate before functioning again, short lived for around 30-40 minutes. Case on or off makes no difference.

Edit:

 
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FlyingFish said:
To be certain of what's at fault your BG man needs to witness the boiler going to fault and test what's happening when it does. Which can be awkward if it's happening random. Could be spark generator, gas valve, pcb. If you have their insurance, just get stroppy until they throw parts at it :D
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Thing is, it isn't random, it's persistent and in a fairly uniform pattern. I've reason to believe it's now the Gas Valve having spoken with a specialist who doesn't cover my locality but kindly shared his expertise, he's not certain but these sorts of things can always be a bit of trial and error.

Having more or less verified the flame fault isn't as a result of the output it's more likely to be an input... I think... :p
 
GazosCalvertos said:
Hi, did you manage to resolve this issue? I'm experiencing the exact same problem. Did replacing the gas valve sort it?

Thanks in advance!
Click to expand...

Yup, new PCB.

BG replaced almost every other part but no joy. Trap, exchanger (rinsed and also a new unit), probes etc were all fine. Condenser pipe wasn't blocked etc.

Hope this helps.
 
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