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Hi all, I’ve been a long time lurker, but this is my first post on the forum... of course it’s because I have an technical problem that I need help with, and based on all the previous discussions on here I’m thinking there is more than enough experience to enlighten me! I have a 4kw Kingspan Aeromax Plus KHP0041 (made by Carrier), heating my UFH system downstairs and radiators upstairs, all was working fine until...it wasn’t. I have 240v in the unit, but no blinking LED on the GMC board. Now i’m not certain what the issue/cause is, but it might be related to the fact that I decided to wire in the alarm unit, so I could see from indoors if there were any issues without having to go out and open up the unit to look at the blinking LED on the GMC board. For some reason I thought it was a 0v feed so didn’t switch off the power and when posting the wire thought the wall I think I shorted it out... as I’m fairly sure it’s actually 12v. So without giving me too much grief for being stoopid, do you have any other suggestion of what would cause the GMC board LED to stop flashing or how I could test it? Before I go and buy a replacement PCB. In penance, I do have PDF copies of the Kingspan Installation Manual, the Carrier Service Manual and the Carrier Spare Parts document. If it’s of any use to anyone. Thanks Gav