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Problem fixed. Have you guys looked at http://www.justanswer.com/expert.aspx? You could earn a few bob.

Lookin' forward to the 53rd? Haven't been to Ibrox since I left Partick in the early 90's. Do you reckon replacing the plate heat exchanger is a job for a DIYer? I hate wasting money. A Yorkshireman is a Scotsman with the generosity taken out.

I got the schematics from the Vokera website, thanks for the input, though. Looks reasonably straight forward, right? No need to drain CH side of system? Just turn of water and electrics and go in with the tool kit. I am also not touching the gas side, right? I don't mind getting wet or...

No codes, just problem with DHW - cycles hot to cold during showers etc. Thanks for the interest.

Thanks for the input. Can the PHE be replaced by a competent DIYer? I've got the schematics off the web. Cheers

Thanks for the input. I'll point out the fault to the engineer. Flow of DHW doesn't change, it just goes cold.

Vokera Linea 28 Comb. Boiler Over last few months DHW supply has become unreliable; it gets to 52 oC and then switches off until temp drops to 28 oC, then it reheats. Each cycle is 3 to 5 min. CH seems okay. I suspect that the heat exchanger for the DHW is clogged with limescale, even though...