I closed off the flow and return valves and went to work. They remained closed for about 8 hours. When I opened the valves, there was a rush of water and I had instant loss of pressure. Is this what you would expect to happen?
Any updates on your story? We are going through the same problem!
We have a 7 year old Saunier Duval Thema f23 and have the British Gas Homecare 200.
5 British Gas “engineers” have come over 5 times in the past week and yet, cannot explain why the boiler works fine and maintains pressure when it is switched on and why the pressure drops to 0 when it is switched off.
They have suggested many things and now, after ripping out some floorboards, they are threatening to rip out our new tiles and walls in search of a mythical leak!!!
Sorry to be the bearer of bad news, but I did have a leak in one of the pipes and it did involve taking up some of my concrete floor. I basically spent a whole day flooding the system - I eventually found a wet patch in the concrete, took up the concrete and fixed the pipe. It's been working fine ever since.
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