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The above boiler starts up on room stat demand, the fan runs, the pilot lights and about twenty seconds later the main burner comes on. All is well for four about minutes or so (timed) Rads just start to get luke warm. Pump would seem to be working ( ie screwdriver to ear against body of pump...

WITH ROOM STAT SET FOR DEMAND AND BOILER STAT MID RANGE WHEN THE BOILER SWITCHES ON THE PILOT LIGHTS, TWENTY OR SO SECONDS LATER THE MAIN BURNER IGNITES. RUNS FOR THREE OR FOR MINUTES THEN MAIN BURNER SHUTS DOWN. IT THEN SITS WITH FLUE FAN RUNNING AND PILOT LIGHT ALIGHT WITH NO MAIN BURNER WHILE...