Glow worm Swiftflow 80. CH runs without problem but DHW intermittent. Boiler
fires up and delivers normal temperature & flow for about a minute then main
burner cuts out, water then runs cold for a minute or two and then main
burner refires and so on ad nauseum. I'm 99% convinced its the overheat
stat. Any other ideas (PCB ??)
When the water has been running for a bit, do you notice a slow down in the
flow ? If it is, then try adjusting the inlet valve to the boiler, because
it might be the pressure switch that is not getting enough oomph to keep the
Our Vokera Linea 28 does that and we think its the diverter valve not
opening fully. Once our friendly local boiler-man has been out (can't
be bothered to start dismantling when the weather might suddenly turn
nasty!) I'll let you know what it was.....
Hmm. *ponder*. I've got the diagrams for the Vokera......
The slight difference with our problem is it appears to be affected by
flow rate, particularly in the shower. Get the flow too quick and the
burner cuts out etc, slow it down and its fine or at least it was last
night. The missus says she turned the flow right up last time it
happened to her so it's sort of not pointing to anything
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