Boiler pressure loss after drain down

Joined
14 Jun 2005
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Location
Worcestershire
Country
United Kingdom
Hi,

Had my system drained down to remove a radiator.

Following a refill of the system I'm having to bleed the towel radiator in the bathroom every three or four weeks, which I completely understand as there's probably air trapped that's working its way around.

What I'm not so sure about is why I am losing 0.1 bar of boiler pressure over the same period (this is without bleeding the radiators).

I've checked all joints, radiators and valves as best I can and can't spot any leaks. I've got a Vaillant Ecotech Plus combi boiler. Could it just be as simple as air passing through the boiler and being released by an aav or something? Or is it just 'normal' to lose this small amount of pressure?
 
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Internal boiler leak that's evaporating?
We had a cracked heat exchanger causing pressure drop with no sign of leak.

Sounds like you need a heating engineer visit
 

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