intermittent hot water Ideal Boiler C80FF

[allende]

"Ideal Boiler C80FF"


We have intermittent hot water. It runs hot for a few minutes, then the boiler clicks off. Then after 5 minutes of running cold the boiler kicks in and it runs hot again. Then it clicks off after another 2 mins. And so on. Very annoying when running a bath or the shower.

Any ideas?

 

[ChrisR]

Sludge in secondaryheat exchanger. Very common topic!

 

[allende]

Right, looking at the manual that does look DIYable- few screws to remove and replace it- no need to touch gas. Is this correct? If so I'll give it a go.

Or is it cleanable? If so do I just flush it through with water?

 

[fitz1]

try to clean with water first. if it requires something more aggressive see your local plumbers merchant to what they have got available.

 

[allende]

Well, all done. Took less than an hour top get the exchanger out, easy to do.

I ran some fernox sludge removing stuff through it but I think it is still sludged up in there. Certainly you can here it swishing about in there when you shake it still.

Replaced it and it is better- longer intervals between it switching off. But I suppose a new one is the only real solution.

Best price online is around £90- is this about right for one?

Thanks for all the help so far.