I have a Housewarmer 45 and it intermittently roars when the boiler fires up. The burner ignites in the lower chamber especially when the boiler first ignites (flue is cold?) The boiler has been cleaned and serviced and a Corgi registered engineer has reset the burner pressure but still it occasionally happens. Has any experienced Corgi engineer solved this one before?

Chilly Willy9, March 2009

yes repaired loads of these on the potterton 45/55 bbu's.
Take the burner out, remove the nut at the back of the burner.
Remove the gauze filter and clean it thouroughly.
Boiler brush through the burner from back to front throughly.
i then get a can of compressed air and blast it down the burner jets .
refit the filter and burner back .
blast compressed air down the top of the oxypliot.
fit the burner back in the boiler.
fire and check correct burning pressure .

mr b, February 2013

I am pleased to say that the Corgi Engineer sorted out my burner roaring problem that was caused by the SIT gas valve. The situation was caused when the boiler ignited and the burner would occasionally blowback igniting the gas in the lower chamber of the burner causing a loud roaring sound. The boiler had been serviced and cleaned with no effect so the SIT gas valve was replaced, the reasoning being that excess gas was getting to the burner on ignition and the large flame ignition would blow back down through the burner. After the new valve was fitted it would occasionally still happen so the gas pressure was checked on ignition and it was found that the step ignition control on the gas valve required adjustment to limit the gas flow for the first 3 seconds. This allows a soft start to a gentle ignition sequence thus preventing the problem.

Chilly Willy9, March 2009

I will bet your Corgi engineer NEVER took the filter out of the burner.He needs to take the 3 retaining bolts out of the end cap and then a round gauze filter will pull out which will be linted up.Put a fluebrush thro it to clean it and you should be ok.

Tony S, March 2009