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Fuse (1A) blows on the PCB in the Potterton Netaheat 10-16?

The 1 amp fuse located on the PCB of the Potterton Netaheat 10-16 MKIIF blows at start up. Pressure switch seems OK adn stats are all working. Anyone know what the fuse protects?
Tony Cameron, July 2005
FUSE WILL ONLY BLOW WHEN A DEAD SHORT IS PRESENT TRY DISCONECTING PUMP AND TRY TO FIRE BOILER REMEMBER ISOLATE FIRST AND MAKE SAFE CABLES OTHER WISE MAY BE FAN

STEVE B&H HEATING, August 2005
link Click here to see other fixes for Potterton.