Worcester Junior

[arran197]

Hmmm, will check it. Spent 2 hours there again today. Don't want to be spending any more time there. I did have to refit the board though, it wasn't in very well! Lol! I've ordered another PCB & a wiring harness, as this one has rusty connectors. Not sure if that'll cure it, but worth a shot. Will also check the other thermistor, but it's so temperamentle that you think you've cured it and then it goes again. Had it running for 20 minutes fine, then gone again & took 15 minutes before it came back on without locking out. But it isn't heat related because the boiler was stone cold when I got there.

 

[AllyBongo]

Id change the aps before doing anything else, at least it will rule it out! And they're not expensive

 

[southcoastboile]

yeah had the same the other day, did a thread on it, if aps is melted then it will need a new pcb also as the fan cuts out before the burner. Probably a stupid idea but is everyone overlooking the obvious and its not just the venturi that needs cleaning? they dont always make boilers lockout on startup as im sure you are aware

 

[newgas]

common fault on these is a fan relay on the pcb sticks causing the burner to stay alight after the fan goes out and damaging the aps, dangerous imo.

 

[arran197]

Just to finish up from the posts I made, I went back to this boiler on Friday with a new wiring harness, APS and a PCB. Boiler was going straight to lock out again after running the fan. So was making me think the APS was actually the fault. Tried it several times, but kept doing the same. So I changed the APS and the wiring harness. Bit of a pain to get the wires round the back of the hood to the overheat and the WPS, but after it was all done, the boiler fired up every time, about 20 times! So fingers crossed that has finally dealt with the little sodding thing.

 

[Nas]

I wish I had seen southcoasts thread last week ...... could had saved myself a few hours
Had the Exact same fault on a 28i junior last week . It turned out to be both the APS and the PCB. Must be a common fault on these standard effiency models

 

[SafeGasInstall]

Just to finish up from the posts I made, I went back to this boiler on Friday with a new wiring harness, APS and a PCB. Boiler was going straight to lock out again after running the fan. So was making me think the APS was actually the fault. Tried it several times, but kept doing the same. So I changed the APS and the wiring harness. Bit of a pain to get the wires round the back of the hood to the overheat and the WPS, but after it was all done, the boiler fired up every time, about 20 times! So fingers crossed that has finally dealt with the little sodding thing.

me just to ask you did not fit the new pcb ,did you ?

 

[arran197]

No, it had already had a new PCB. Which didn't solve the problem. So after further talking to Worcester (who said it was a board fault in the first instance as well as me and my technical supervisor saying the same) they diagnosed a faulty PCB. But to be honest, the aps was causing some confusion when checking the continuity of it. Having said that, the harness was in crappy condition, so I think it was a combination of the 3.

 

[Billy Bob Bob]

pcb,s are very weak on this boiler got one doing this at the moment had a universal aps fitted for testing reasons,faults the same fitting a new pcb tomorrow

 

[arran197]

Strange really, because Worcester boards are usually good. I just hope it's still working as I type and it hasn't died again!

 

[Nas]

pcb,s are very weak on this boiler got one doing this at the moment had a universal aps fitted for testing reasons,faults the same fitting a new pcb tomorrow

Learnt this the hard way. I Replaced the APS with the old PCB still in , It immediatly took out the APS again.
Had to get another APS and replace it at the same same time as the PCB to fix it. Ran out quickly hoping it would last...

 

[newgas]

Being an SE I would/could have been seriously out of pocket with the parts changing thats going on, I wish I had access to parts like you chaps.
In my world you have to diagnose and rectify the problem first time for a satified customer who will the pay you if not.....

 

[arran197]

When you work for yourself I bet you make sure you know what the problem is by spending more time at the job. My management say you should spend 30 mins tops diagnosing. They want a minimum of 7 breakdowns attending per day! Kind of puts a lot of pressure on you if you come across a boiler you're not overly familiar with.

 

[newgas]

When you work for yourself I bet you make sure you know what the problem is by spending more time at the job. My management say you should spend 30 mins tops diagnosing. They want a minimum of 7 breakdowns attending per day! Kind of puts a lot of pressure on you if you come across a boiler you're not overly familiar with.

Like the more experianced fixers will say repairing boilers is an art and being good at it can take years and lots of out of pocket moments to get there.