Worcester Junior 28i Faulty Pcb Board

[WilbertUK]

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 correct outputs
- All internal fuses on the PCB board are tested and showing OK
- I put a temporary link across LS and LR but when the 240v is switched onto the boiler no lights show on the front of the boiler (reset light, blue light or the maintenance light). The boiler doesn't even attempt to fire.

I have already replaced the PCB board and the fan PCB board but this didn't fix the issue.

What further checks would you recommend to get the boiler to fire? Any advice would be appreciated!

 

[gazfen]

Get a gas safe engineer, ya shouldn’t be in there.

 

[WilbertUK]

Get a gas safe engineer, ya shouldn’t be in there.

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.

 

[gazfen]

Get one they knows what he is doing. Is it a combi

 

[WilbertUK]

Get one they knows what he is doing. Is it a combi

Yes it is a combi boiler

 

[gazfen]

Is the hot water ok

 

[WilbertUK]

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

 

[gazfen]

Polarity ok at boiler

 

[WilbertUK]

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

 

[gazfen]

Check with a multimeter.

 

[Deleted member 267285]

It s a gas safe engineer that's doing the checks.

I have checked the following:
I have already replaced the PCB board and the fan PCB board but this didn't fix the issue.

Confusing.

So you put a link across heating and the boiler goes dead?

 

[WilbertUK]

Check with a multimeter.

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

 

[WilbertUK]

Confusing.

So you put a link across and the boiler goes dead?

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

 

[gazfen]

Call a decent gas safe, these are a piece of **** to work on, if you’ve got no power on the board. Then something is blowing the fuse. Any noises from the fan or pump.

 

[WilbertUK]

Call a decent gas safe, these are a piece of **** to work on, if you’ve got no power on the board. Then something is blowing the fuse. Any noises from the fan or pump.

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