Combi boiler

[codswallop]

I have the above boiler installed.When maintaining the water pressure,which is 1.5 (psi?)do you adjust it when the pump is on or off.Thanks!!

[The Builder]

That's 1.5 Bar, Codpiece ................ (approx 20psi)

When the water is hot, it expands and the pressure rises. This will give you a false reading. Top up the pressure when the system is stone cold (pump no running). A good time would be just before it's timed to come on.

[codswallop]

Thanks for that T'Builder ,I'll do that in the morning.