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junkers eurostar combi boiler will not ignite?

I have a Junkers Eurostar combi boiler which runs on bottled gas and it will not ignite.There is gas to the boiler and a good spark but must be a sticking valve or something as it will not release the gas.
Model is ZE/ZWE 24/28 - 3 MFA
Any idea's ?
GRAHAM, August 2008
Eurostar boiler 70/90 keeps cutting out! Im having to go to boiler and press the button with orange light to put it back on but then it blows out again minutes later

Claire, October 2009
I get the same problem with my Junkers Bosch and normally fix it by purging air from gas supply. Where the gas pipe enters the boiler, undo the nut until gas expels for about 5 seconds, re-tighten the nut, wait for gas to clear and try again.
Hope this helps.

Vince, October 2008