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Author: Subject: Oil fired boiler question
mookaloid

posted on 16/2/16 at 08:13 PM Reply With Quote
Oil fired boiler question

Any oil boiler techies on?

I got a Worcester Greenstar 12/18 kw oil boiler.

It won't fire up, if I press the big red button the fan comes on and I get a spark. Some oil comes through - it ignites and cuts out straight away.

Any ideas please?

Thanks in advance

Mark





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Toys2

posted on 16/2/16 at 08:17 PM Reply With Quote
No expert, I have a similar boiler, once (after it had been serviced) I had to reset it, If I recall correctly there is a reset button behind the front cover - slightly hidden by the front controls panel?
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mookaloid

posted on 16/2/16 at 08:19 PM Reply With Quote
Yep that's the big red button





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mark chandler

posted on 16/2/16 at 08:50 PM Reply With Quote
Bit cold to be without, on balanced flue boilers you have a little pipes that respond to air pressure in the exit of the exhaust, if these get sooted up or a tiny bit of debris then the boiler believes the vent is blocked, fires and cuts out immediately.

Is the exhaust all clean and clear?

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sprintB+

posted on 16/2/16 at 08:52 PM Reply With Quote
inside the head you will find a "magic eye" it senses the flame, if its dirty it will not sense flame and cut the oil off. Look for a small cable going into the burner head, normally they are a loose fit, pull it out clean it and try again, if it fails to light you have a faulty sensor. Have you had it serviced recently ?
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mookaloid

posted on 16/2/16 at 09:00 PM Reply With Quote
Ok not a balanced flue so I don't think it's that.

I checked the magic eye and it is very clean.

I guess it might be that then, is there any way to check it?

Was serviced last year. Is the magic eye a service item?

Cheers Mark





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hizzi

posted on 16/2/16 at 09:13 PM Reply With Quote
is your greenstar the condensing version? if so blocked or dirty condensate will cut it off as well. have you checked your oil level?
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mookaloid

posted on 16/2/16 at 09:17 PM Reply With Quote
Yep condensing. Condensate pipe clear.

Oil tank nearly full

No air in system tiger loop fitted - I checked the bleed screw anyway





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obfripper

posted on 16/2/16 at 09:27 PM Reply With Quote
The photocell should have 0.5-20k ohm resistance in bright light, >500k ohm in the dark, you should be able to get one from most plumbing suppliers from stock.

Dave

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mookaloid

posted on 16/2/16 at 09:42 PM Reply With Quote
ok measuring it now

if I'm reading the meter correctly: in bright light it's about 0.3k ohm in the dark its off the scale





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v8kid

posted on 16/2/16 at 10:12 PM Reply With Quote
I had similar problem it was sooted up it seems that condensing boilers need frequent servicing. Remember your guarantee is for 7 years with bosche
Cheers





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hizzi

posted on 17/2/16 at 07:46 AM Reply With Quote
bosch seven year warranty is subject to the boiler being serviced yearly. so many folk get caught out by that. doesnt have to be worcester that services it, as long as oftec number or gas safe number is put in the book
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mookaloid

posted on 17/2/16 at 08:12 AM Reply With Quote
In true locost fashion, the boiler is second hand off ebay so no warranty.....





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sprintB+

posted on 17/2/16 at 11:35 AM Reply With Quote
I'm not saying this is the right thing to do,BUT, put the boiler in run, shine a bright torch into the magic eye, if it stays lit, OK. Then quickly remove the torch and see if it cuts out. If it does your sensor is OK. Sometimes the flame pattern is interrupted by dirt and the sensor cant see it, but that is extreme.
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mookaloid

posted on 17/2/16 at 11:55 AM Reply With Quote
Buying a new magic eye today will try this evening......





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dmac

posted on 17/2/16 at 05:55 PM Reply With Quote
The photocell works a solenoid on the pump and these used to fail regularly on mine giving the symptoms you describe, trace the cable back from the photocell to find it. Once you find the part number it can be replaced easily.

Dmac

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mookaloid

posted on 17/2/16 at 07:23 PM Reply With Quote
Thanks all.

Eventually I worked out that the oil wasn't coming through as well as it should.

I stripped the pump down and cleaned /blew out with compressed air and it all works perfectly now.

Thanks for all the suggestions

Radiators toasty warm again





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