Oil Boiler help needed

3 Jun 2008
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United Kingdom
Hi I have a Worscester Bosch Danesmoor 26/32 oil fired boiler.

The lockout comes on when the boiler tries to fire up.

Previously everything was ok, oil level was quite low so I thought that this may be the problem. Have tank filled today and I have checked that oil is getting to the boiler and there is no air in the oil line from the tank.

Reset the boiler as per the user manual, boiler tries to fire but lockout light still comes on.

Is there anything that I can check without a major strip down.

Any help greatly appreciated

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Try continuity of coil on the oil pump. It could be a faulty control box, it could be a failed transformer.

What's your background? Then I can say more, or maybe that it's better to get someone in.
Hi Oilman

Thanks for the quick reply. My background is Electronics.

The boiler is only just 2 years old and just out of warranty as of March this year

To be honest I dont fancy stripping it down hence the obvious checks question. Dont suppose you have a service manual?

Thanks again for the help.

Best regards
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If you're electronics, and you have a meter and a test lead with points at both ends, you can do some tests.

Press lockout button. Motor will start and run for around 20 secs when you should hear a click. That's the solenoid operating.

Alternatively, disconnect burner lead. Remove control box. Remove the burner. You should be able to work out which terminal in the control box is which from the connection diagram on the control box. Short the ignition transformer terminal to the live and see if you get a spark in the business end of the burner. Try the same for the solenoid valve terminal where you should hear a click. If these work it could be the photocell or the nozzle.

If you have problems with the above being unclear, you need to get a man in.

The installers should have left a service manual, if not. ring bosch and ask for one.

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