Vaillant 418 unnecesary purge cycle

Probably runs on windows. This is a Linux newsgroup!

:)

It may well have an anti seize cycle to exercise things like the pump and fan during periods of low use.

Does this occur just as you run a cold tap close to the boiler?

Forget that, yours is not a combi.

ARW was thinking very hard :

Not that I have noticed, but there could be no link between the two anyway - it is an open vented system.

My Keston does that every 24 hours of non-use, according to the manual. In 16 years, I only heard it do it once, but you need to be in the bathroom at the time, and not having a shower or anything else noisy, in order to hear it.

I included the same feature in my heating controller for the mid position valve (which controls upstairs and downstairs heating zones, not hot water). If it's not operated in last

Andrew Gabriel presented the following explanation :

My boiler is in a kitchen cupboard, which makes it noticeable when it is quiet in the kitchen. I noticed it this morning again, at 09:45. It is set to allow CH, but the stat is set to 15C so it should not be called in this warmer weather at all. The last time it was called to provide any heat was yesterday, for HW - I had a bath, then Jean had a bath in the afternoon and it was timed to come on heat HW at 16:20. So probably there would be no call for the boiler to fire any later than

I have not read the manual thoroughly, there is a lot of it, but I didn't spot any mention of it doing an occasional purge, so I have emailed Vaillant to ask them about it.