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How can i fix my compact 80 e boiler?

Recently had the boiler serviced. Heating side of boiler not coming on.Changed the micro switch and also the thermister and overheating stat but to no avail.I have since put a new circuit board on but the problems still there.Any ideas?
Rosco, April 2009
have you checked external controls eg faulty room stat, water pressure ok?

STE, April 2009
Are the Flow & Return Valves open under the boiler? is the Room thermostat calling for heat, is the time clock in an ON Period ?

Boiler Repairman - Ipswich, April 2009