More banging

10 Jun 2005
Reaction score
United Kingdom
I have an old Glowworm Fuelsaver 40B Mk2. Tried to fire it up after draining radiators to replace one in bathroom and cure leak in another. Also had a new bathroom installed. Bled rads so no air there. After firing up the main pipe above boiler gets VERY hot and starts to bang and shake violently. There is a \\\"Honewell\\\" box nearby and when held off auto, it stops banging for a while then starts again after a few mins after it moves back to auto.

Any ideas anyone?
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you need to fill it with the valve hooked on manual then you need to vent the air from the system. Somewhere there will be a length of vertical pipework with a cap on the top to undo and let the air out. Sounds like your pump is probably running dry which will kill it fairly quick if you dont bleed the air from the pipework.
Thanks. There is an 8 inch vertical pipe sticking out the top of the boiler. Which vlave to manual. There are two. One has a lever that resists when you move it, the other is just loose.
Not been running it. Luckily we got a fir heatwave going on (32 deg cent) at the moment.

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