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I completely agree Terrywookfit but the new motor was sitting there on the shelf so there was nothing to loose. The pump felt OK with no tight spots, the coupling was sound and the fan was not binding anywhere. Assuming the engineer's assessment of the Danfoss pump is correct and it is sound...

Hi oilboffin, Thanks for the thought. Another lockout on first firing this morning. That's 4 days since the last one! Fired first time on pressing the reset and OK since then. The electrodes were re set by the boiler engineer on his last visit but I will have a look. I have the installation...

Hi oilhead, Thanks for your input. The ignition is by conventional wound transformer. There are no signs of overheating or melting of windings or insulation. Having observed the spark on a significant number of firings (throug the blue plastic lens on the burner) the spark is steady and...

Hi oilboffin, Thanks for your comments. When I have been within earshot of the boiler when it has gone into lockout the lockouts have been preceded by pre venting but no ignition so the flame is not being extinguished or failing but rather it is not being established. Every time I have observed...

Already done and is fine - thank you.

Hi Terrywookfit, As I've no means of analysing flue gasses I have to rely on the service engineer to sort that out. I acknowledge that the 'newness' has worn off the boiler but prior to December it was as good as gold. I'll just have to keep monitoring it and hope to establish some sort of...

Hi Terrywookfit, co2 is 9.9% and o2 is 7%.

Hi oilhead, That did cross my mind. The pump is a Danfoss BFP 21L3. It was checked out by the service engineen on his second visit. The pump feels smooth and output pressure would go as high as 200 psi when he checked it with a pressure gauge. The pressure is currently set to 120 psi as required...

Hi Guys, Thanks for the responses. On the last 2 occasions when the boiler went into lockout and I was in the vicinity the motor started, it went into pre vent cycle as normal but did not ignite. On both occasions it was the first 'firing' after a shut down period of some hours so everything was...

I have a Redfyre Centrajet 18/25 pressure jet boiler with a Selectos Burner which has started to suffer from intermittent lockouts. It has been regularly maintained, it is in good condition and is serviced every year. The last service was in October 2017 during which a new nozzle was fitted...