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Glow Worm Flexicom 30cx Intermittent leak

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Hi

Have a Glow worm Flexicom 30cx-Installed 2010 and regaularly serviced. Last service October 21.

Works fine, with no issues.

However it has started to leak-though never when the house. is occupied.

Went to Scotland over hogmanay for a week and when we returned there had been a leak of water.Not a huge amount, most had been caught in a cooking foil tray (Think chicken in a bag size).

No leak obvious from the boiler though water pressure was lowish (0.8 bar) so I topped up.

Following week we were at home, no problems. heating comes on at 15:00-20:00 then off overnight

Over the last month or so we have been away from the house most weeks for either at least 2-3 nights.
Weather has been variable-sometimes freezing sometimes 6-7 degrees at night.
Boiler is set to 5 degree anti frost temp.

On our return there is evidence of a leak (I put containers under the boiler to catch it). Not a huge amount , maybe a cupful per day we are away.

Took off the cover had a look but could only see pooling of water at the bottom of the boiler-nothing obviuosly leaking.

Thought it may be temperature related so next time we were away I set the thermostat to come one at 11 degree and put it in the same room as the boiler.

Two days away-leak evident when returned.
Any ideas?

Thanks
 

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