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I've also checked the resistance on the modulator and its ok giving between 120 and 140 ohm.

I've run the boiler with the gauge connected to the inlet test point on the gas valve and it goes down to give a reading of 17.5 mbar when either CH or DHW are running.

What is a preset Paul? No ECV is fully open , am getting virtually 21 mbar at the boiler gas valve as well.

Tony I have removed the thermisters and mesured the resistance using amultimeter as they were subjected to increassing temperature. Resistances for both decreased as temperature increased.

I agree with and note the sarcasm there mate. I have a friend in that situation who is an highly competent electrical engineer . On the other hand I have been doing the electrics in my houses for years and have yet to kill any1, burn anything down or give myself any shocks. Is it fair that I am...

My boss likes the valliant but we recently fitten a greenstar with wireless controls- piece of cake and ran like a dream. :)

Did you do gas first Paul or electrics. I'm doing a limited scope part p course in a fortnight and am considering carrying on to get full scope. What would be the best way of going about doing this?

No , not the user control pcb :cry: Having meassured the voltage at the modureg -there is 20V there on both CH and DHW. These voltages do vary if I adjust the potentionmeters on the main pcb but they do not vary as the flow of water is reduced on the DHW or rads are closed off once the...

Which manufacturers MI's are those?

Thanks for the advice Paul. It wsa a good read .This has been a very good learning experience for me :) . I've just checked the voltages to the modureg . There is 20volts at the modureg so it should give max pressure of 16mb on DHW but it doesn't and there is no modulation of burner as voltage...

Thanks for your response agile . Sorry I can't give confirmation I'm CORGI registered as I'm not yet. I take my ACS in 2 weeks and will then seek registration with CORGI unless some other registering body is available then :lol: OH and it is my own boiler.

Agile - I take your point the pcb could still be faulty. However ,how would you set the min and max pressures though when the burner is either on or off at the moment with nothing in between even when the potentionmeters are adjusted. Sorry if I'm being a bit dumg here.

try a different sized seating

Yeah - I've already tried that with the u gauge on - no change at all to the burner pressure. For some reason the gas valve only opens upto 5mbar.

Basically yes.

Why not just try replacing the washer first? Being old its probably 3/4 inch

The burner pressure stays at 5 mbar for both DHW and CH.

Well thanks for your help Raden - so generous. Tha pcb has already been replaced , so what I'm basically asking is could there be an electrical fault somewhere else causing this, such as the from the user control pcb or anything else?

Glowworm swiftflow 100. There is no modulation on the burner. As a consequence on the CH side the pressure is shooting up to over 3 bar as the boiler overheats and the gas valve shuts off. Will it be the modureg or some electrical fault?

Was he from Britisih Gas :wink: lol