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What could be the cause?

the pressure is high and the bolier does'nt light
Mr R. Nelson, September 2009
PLEASE help us to help you.
Make and model of boiler...
Will you people please give as much info as possible.
Such as what happens, any noises, pump, fan, spark. At what part of the start up sequence does it stop?

J, September 2009
thermo coupling possibly gone u/s

me, September 2009