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worcester350?

low pressure light on with boiler pressure at 1.5 bar
stu, November 2008
Or the pressure gauge is faulty.

M, November 2008
It won't. If the low water pressure switch trips in error it will kill power to the boiler.

Change the switch.

BunSlinger, November 2008
no

stu, November 2008
is the boiler still running

b, November 2008