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WHY ISENT MY BOILER WORKING?

MY BOILER STARTS UP FIRST THE FAN STARTS AND AFTER 5 SEC IT GOES OFF THEN IT STARTS AGIAN THEN AND GOES OFF THIS CARRYS ON FOR AGES IT USE TO COME ON BUT NOT ANY MORE WHAT DO U THINK IT COULD BE PLEASE HELP ME
CHRIS, April 2008
check the air pressure swict, and venturis are all ok, once the fan starts the boiler is then looking for the venturis to make the aps.

T, April 2008