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Again thanks for the reply, and while I appreciate it's difficult to diagnose remotely what the problem may be, any chance in imparting what your collective wealth of experience may think it is. Thanks again, tom.

Hi Andygasman, thanks for the reply. You may be right in saying gas valve may have been a waste of money considering I'm no better of after fitting it. Did soapy water test on the top and bottom unions immediately after opening the boiler gas supply valve and before switching power back on...

Yeah, don't take the **** mate. arsehole

Thanks for the swift reply clf-gas. Gas supply pressure is suspect? Had thought about that except that the boiler had been working fine until it stopped and after fitting new gas valve it has fired into life a couple of times via HW demand but as soon as demand is stopped and restarted it...

Hi, I've got a Worcester Bosch 24 CDi RSF that will not light. It sparks, a very small flame appears but doesn't light fully then after about 5 seconds goes out and goes into boiler lockout mode indicated by a slow flashing CH red light. Both the PCB and gas valve have been replaced and I'm...

Hi, I've got a Worcester Bosch 24 CDi RSF that will not light. It sparks, a very small flame appears but doesn't light fully then after about 5 seconds goes out and goes into boiler lockout mode indicated by a slow flashing CH red light. Both the PCB and gas valve have been replaced and I'm...

tom955i