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Beware, although in most cases no display means main PCB failure it could mean the User Control PCB Kit has failed or also failed, the part number is 170993. When repairing Isar and Icos boilers, we normally go armed with both items and fit the User control kit first as it is a lot cheaper.

Thanks MisterDubya, I am hoping you may have the solution to the problem. I would really like to speak with you, I will send you a message to discuss further, thanks again.

Don't worry we are installers and yes we are qualified to work on warm air. We have fitted a new flue to the unit and found the gas valve faulty during the commision. I really don't want to say to our customer that they need a new boiler/system or a replacement warm air unit after carrying out...

Thanks for that. I did see that gas valve on another website but disregarded it as the part number although similar was not a match. Do you think this valve can be used? I will ring Glen Dimplex to clarify. Thanks again.

Help!!!!! I am desperate to obtain a gas valve for a Halstead GWA46W warm air unit. I believe the part number is 850509, the GC number of the part is 392757. The gas valve is manufactured by Eurosit. Now I realise that this part is obsolete the warm air unit has 1986 on the data badge but could...