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Hi, I hope somebody can point me in the right direction with this.
I have a Worcester Heatslave 20/25 Oil-fired combi boiler (c.1999) with an Inter 2011 burner (Bentone 90w motor + Danfoss BFP11 3L oil pump, two pipe system) and room sealed balanced flue.
Boiler normally starts ok from cold and will run for between 30min to an hour before burner switches off without water reaching thermostat setting. Turning fascia thermostat down and then up to restart burner results in a bit of twitching and attempted turning of the burner motor (a bit like a dodgy starter motor on a car). Sometimes the burner will restart like this, especially if allowed to cool for 30mins but usually not.
I have checked that the fan impeller is clear, cleaned the flue, the photocell and all oil filters, renewed the nozzle and oil lines, and checked that the electrical plugs are pushed home. I have even tried swapping out the motor with a known working one.
All the water pumping side of the boiler seems fine and the fascia thermostats, DHW, and CH work ok when the burner's actually going. The burner problem doesn't generate a lock-out, it just clicks off and won't restart without a good rest and a lot of twitching and sticking.
I'd really appreciate any suggestions that might help me narrow this down.
Thanks.
I have a Worcester Heatslave 20/25 Oil-fired combi boiler (c.1999) with an Inter 2011 burner (Bentone 90w motor + Danfoss BFP11 3L oil pump, two pipe system) and room sealed balanced flue.
Boiler normally starts ok from cold and will run for between 30min to an hour before burner switches off without water reaching thermostat setting. Turning fascia thermostat down and then up to restart burner results in a bit of twitching and attempted turning of the burner motor (a bit like a dodgy starter motor on a car). Sometimes the burner will restart like this, especially if allowed to cool for 30mins but usually not.
I have checked that the fan impeller is clear, cleaned the flue, the photocell and all oil filters, renewed the nozzle and oil lines, and checked that the electrical plugs are pushed home. I have even tried swapping out the motor with a known working one.
All the water pumping side of the boiler seems fine and the fascia thermostats, DHW, and CH work ok when the burner's actually going. The burner problem doesn't generate a lock-out, it just clicks off and won't restart without a good rest and a lot of twitching and sticking.
I'd really appreciate any suggestions that might help me narrow this down.
Thanks.