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frequent re-pressurising of Baxi combi 133HEplus?

I an having to re-pressurise my combi boiler a Baxi 133HE plus every other day. There is no sign of any leaks anywhere on the system, any ideas what the probelm is?
robertlb, April 2009
check for a pipe outside prob near where the boiler is hung if it is dripping you will need a new pressure relief valve.

aa, April 2009
Yep - a leak. If none visible, it could be leaking into the boiler heat exchanger, and the water vanishing as steam.

John, April 2009
link Click here to see other fixes for Baxi.