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    Worcester Bosch Danesmoor 20/25 - locking out

    My boiler has just started locking out and I am hoping for some advice. Burner is Electro Oil Inter B11C with conventional flue, oil tank above boiler, single line to Danfoss BFP 11 pump. The boiler has run from new faultlessly for 5 years. System is Honeywell S plan, sealed. I have...
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