any worcester experts?

[southcoastboile]

Been out to this boiler 3 times now. Intermitant fault so it can work fine for a day (fired up 60 times on one ocassion, worked every time) when it does lock out, fault comes up, "ea" flame rectification.
When it does fail to light the probes ignight the burner and it fires up for around 2 secs then cuts out.

I have changed the probes.
Checked high and low co%
cleaned heat exchanger.
checked wp
had guvoner replaced at meter
cleaned condence trap

Still got fault, i'm leaning twords pcb, anyone come across this or have any ideas?

 

[hammers4spanner]

Sounds like a bit of a lemon to me ,,,economically viable ??

 

[Roger Welton]

Earthing problems can cause this sort of annoying intermittent problem.

 

[Curnsie28]

Have you checked the resistance on the coils of the gas valve? I think from memory they show both read around 160ohms, a break in one of the coils can cause an intermittent fault with no gas supply showing up fault code EA

 

[mike_s]

Have you called Worcester's technical support line? They are very good, usually answer the phone straight away. If you can't be sure enough of the problem after going through all the checks with them then maybe refer it to them as they will replace up to 3 major parts at least for a fixed price of about £275 quid. If you've been there 3 times I wouldn't want to waste more of yours and the customers time. The customer should appreciate you doing this rather than guessing.

 

[aggis]

Go on WB web site order yourself an engineers booklet, really helpful.
If cdi range look at the diaphragm in fan/burner tube.
My last intermittant WB Junior he fault ended up as the gas valve, even the resistance 's of the coils where correct. Had changed ignition electrodes, burner gaskets & rechecked co/co2.

 

[mutley racers]

where is the engineers booklet on the website? Under literature

 

[southcoastboile]

I rang worcester an they think pcb may be faulty. Dont think its gas valve or coils as the burner fires up. Never changed a diaphram between the fan and burner tube? could you elaborate on this please

 

[mike_s]

I think the fan diaphragm splitting was quite common the the original greenstars. Easy to replace and instructions to show you where and how should be in the servicing instructions.

 

[cdodds2004]

i tend to agree with worcester i had the exact same fault on a baxi and it was pcb!

 

[cdodds2004]

i cant find the engineers booklet to order either? maybe im being dumb and cant find it

 

[bennygas]

any use southcoast?

http://www.worcester-bosch.co.uk/cache/file/1/greenstar-cdi-service-booklet-for-engineers.pdf

seems to be that these books are within each relevant appliance node in the menu on their website. think i've got the one's for the older greenstar he etc knockin about somewhere if you need 'em.

 

[southcoastboile]

any use southcoast?

http://www.worcester-bosch.co.uk/cache/file/1/greenstar-cdi-service-booklet-for-engineers.pdf

seems to be that these books are within each relevant appliance node in the menu on their website. think i've got the one's for the older greenstar he etc knockin about somewhere if you need 'em.

Cheers Benny, boiler has worked fine since my last visit there so will have to go and have another look if they call back.

 

[bennygas]

sound. fingers crossed its ok.