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Have you checked both pipes coming from the boiler and heading outside?
I'd chat/email the manufacturer to confirm it can run ok supplying just DHW and with the F&R CH isolating valves closed. Explain why.0 -
Albermarle said:If the pressure is on 1.5 bar I'd say it would be 4-5 weeks before it drops to around 1.
If it is a leak, then it is a small one, which maybe is why you are struggling to find it .
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Tip one - determine whether it's from within the boiler!
So ask the manufacturer about shutting off these valves.
Simple obvious first step.1
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