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Seems to be coming from the programmer. The display is now blank. I've tried to upload a video, but it says it doesn't have an allowed extension. It's a .mov

It vibrates and repeatedly clicks twice. I can video it tomorrow.

Thanks again for everyone's advice. It's much appreciated. The boiler is at my parents' house. I've just been round there now to check the things people have suggested and take a few photos... The boiler control hasn't been reconnected as I thought (please see photo), so I am unable to check...

He refitted the original circuit board and the programmer's display came back on. Thanks for the tips everyone. I'll have a look tomorrow...

I've no idea if it's a y plan (don't know what this is). The gas engineer has already removed the programmer fascia. I don't think it is battery operated. He fitted another circuit board (I think, at least he mentioned pcb) to test it and refitted the programmer, but that just made the display...

Hi, we have a Potterton Netaheat boiler with a Honeywell ST7100. Whenever the hot water is programmed to come on, we just hear a loud vibrating noise (we can't tell where it's coming from, but it's not the motor) and the pilot light doesn't go on. The central heating works fine. Our gas...