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It sounds like you have a primatic cylinder if you have only the one tank. Go for the combi -that way you get mains pressure cold and hot water to your shower and problms should be over.

Its not a glowworm swiftflow 100 is it? Lol - exactly the same problem

Also there is no modulation , I had a u gauge on and even on the DHW the burner was either on or off.

Which side is your trv at and is bi-directional?

Very hot - lol .There is no to little difference in the temp of the flow and return pipes. I haven't actually measured them but thats by touch. All rads are getting blazing hot - too hot to touch really.

No joy on with the potentiometersI'm afraid. The CH pressure is about 1.5bar. When it is turned on it goes over 3 bar and then the gas valve shuts . I stood theit and timed it and it was around 25 mins.

Losing that much pressure I would assume it was the prv - I know you say there was no leaks from that but I take it you didn't stand there for two days keeping an eye on it? hehe. Thats a lot of water to lose and not notice where its going if its not the prv.

I take it then if I attach a U gauge and measure the burner pressure with a call for gas and then alter the potentionmeters this will alter the burner pressure to what is required for CH and DHW? Oh and thanks for the pointer :D

Actually to blunt - I do know where they are but haven't the foggeist idea of how to go about setting them. Its certainly not covered in the installer instructions. :cry:

If the rads have trvs on them check the spindle isn't stuck in the closed position. Unscrew the top of the trv to get to it. Either hit it with a hammer and punch or be a bit more gentle and pull it up with a pair of pliers.

Theres 4 of them right - 2 for DHW and CH temp and 2 for DHW and CH gas pressure? Which ones should I be looking at ?

Gremlins? :)

Glowworm swiftflow 100 boiler. I have replaced the PCB and the DHW side is now working fine but when the CH is switched on the burner stays on no longer than 40 mins from cold. Less if it has recently been on. The gas valve just shuts off completely. It also doesn't look as if the burner is...