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Yeah I just double checked the manual and measured again (on AC range) and i'm definately measuring across pins 1 and 2 on PL6 (both yellow wires from the transformer output). No reading! Thanks for the confirmation raden.

No voltage at all across pins 1 and 2 (yellow). Is that the tranformer shot?

The input to the transformer is reading 240vAC as required but the output to IC1 on the mod board is reading 70v, not the required 25v. Do you think this will this have damaged the board? Incidently the output from the transformer to the fan relay is reading 240v and not the required 90v as...

Thx for fast reply Baxmax. What makes you suggest the transformer ? Does the rest of the board run at 24v ? Cheers KD

Hi all, have a problem with my Potterton Puma 80e. The red led mains indicator on the front user panel does not illuminate thus the boiler does not start. Have checked the 3amp fused spur supply and is OK. Followed the wiring through to the mod board all OK. Also checked the internal T2A...