The above answer was for the question posted 4 years ago.
Doitall i only read the first bit and answered. That will teach me to read a bit more
Doitall i only read the first bit and answered. That will teach me to read a bit more
We've all got that T shirt.
Wrong way.
From cold open all the TRV's fully, then close the bypass valve No1, and turn the boiler on.
Slowly open the by-pass valve untill you get a flow through it, then turn it back one full turn.
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