Perfect timing f28 glow worm… blocked condensate pipe

[Giblets46]

So I have a glow worm energy 25r. Fitted about 13
Months ago, so due it’s first service.
However in typical fashion, got a couple of errors today! First was just an ‘error’ I restarted and it disappeared, however this evening it displayed f28 error, restarted and ok again.

not sure if related, but I’ve noticed recently that the hot water in the kitchen takes longer to reach the tap, and when it does, the pressure seems less (we have a hot water tank and gravity fed system), with the hot water running if you turn on the cold, you lose the hot water (normally the temperature would gradually lower).

Would a blockage somewhere cause both issues?!

Should add that it heats the radiators and a hot water tank. If that helps

 

[Stuckinarut]

F28 is an ignition fault, with possible causes such as a lack of gas, blocked condensate pipe, gas valve fault, rectification fault et al.

 

[Giblets46]

Thanks, yeh it’s now terminal. Had a f29 also but mostly f28… ..


Edit: looks like it is a blocked condensate pipe. The tube came off underneath and full of water, emptied the top end and restarted immediately.
Any tips on unblocking these?! Mine has a fairly convoluted route that ends up in a pipe leading from the utility room sink, and is mostly hidden.
I actually managed to blow down the pipe from the boiler end to towards the sink) and after some initial pressure it flowed easily. Sprayed some degreaser down it (figure some gunk may have lodged in it where it meets the down pipe!?)

 

[trojanhawrs]

Does it have a trap and an air gap? If plumbed downstream of the sink i believe it should be dropping into a trap 100mm higher than the top of the basin.

 

[Giblets46]

Thanks, I don’t believe there is an air trap, it it does it is probably hidden (the pipe is covered most of the way) . But does make sense as it seemed like quite a lot of liquid to come out of the pipe (at first I was unable to tell which direction it was coming). Pipe is around 20mm diameter if that helps with a rise of around 1.2m and horizontal aboiut 1.5m

 

[trojanhawrs]

Only need a 45mm drop per metre min so that will be fine I would have thought, if you look at the manual for your boiler though you'll see it should be dropping into a trap but not submerged. If your sink lip is 900 off the deck then the open end dropping into the trap should be 1m or higher