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Thanks for help so far Ian. Just to clarify the engineer took the transformer and tested it. He doesn’t carry test rigs with him in the van. Are there any other qualified gas safe engineers that have came across this problem that could advise ?

It was tested by the engineer using a test rig so I’m assuming that had power otherwise how would it get a reading…

Was told it was giving out 9.5 volts and 24 volts.

It's a black transformer and there is 1 blow and 2 glass fuses.

I didn't do the test but he said the readings were fine

Switched off the supply, unplugged the transformer, had test leads on the input and checked the supply on output of the 4 pins, each pair was giving the correct output

Ok thanks I'll tell the engineer to order another new main PCB board and see if that does the trick (y)

The fuses have been checked and are ok so that rules them out. There is 240v at the boiler connection so the 3 amp fuse at the spur has to be ok. The fuses on the PCB board were checked with a multi meter and all showed ok. The plug in transformer on the PCB board has been tested remotely and...

No noises from the fan or pump, dead as hector

The fuses aren't blown... internal fuses and the fuse at the spur unit were checked with a multimeter and are all showing OK.

No the link was put across to eliminate any stats or timeclocks which were connected

Already has been checked with a multimeter and the polarity is correct

Yes, brown is positive to positive and blue is negative to negative

No, when he run the hot water the boiler doesn't fire

Yes it is a combi boiler

Its a gas safe engineer that's doing the checks. He suggested a replacement main PCB board which has already been fitted but I'm just trying to narrow down my options.

I need some help with a Worcester Junior 28i gas boiler and I'm hoping someone here may have came across this fault before ... I have checked the following: - 240v at supply connections - All internal push on connections are correctly fitted to the PCB board - The transformer is giving the...