Powermax 155 Boiler - Lockout and loud noises



Please can you help? :?:

I have a problem with my Powermax 155 boiler. Everything was working ok, but the other day the boiler began to whistle and bubble, so I turned it off. I noticed that a downstairs hot water tap had been left trickling overnight.

Initially I thought that air might have entered the system or that the water level was low, but the system pressure is normal (1.5 Bar). I've drained and refilled the boiler and checked all of the radiators and pumps for air.

Now when I attempt to turn on the system it goes into Lockout and the burner fails to light. The whistling noise has stopped, but there is a loud bubbling noise and the flue in the attic is coughing and gasping.

Can anybody diagnose this problem so that I have a rough idea of what to say to a plumber? :confused:
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29 Jan 2008
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United Kingdom
Yes i can diagnose but because of the nature of this boiler it is not diy work and these babies need to be carefully repaired/serviced. Any competant powermax repairer will know instantly what the problem is so get one in and describe what you have posted on here.

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