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Mend Fan Pump Start

Fan & Pump start ?

The fan & pump come on at around 3 in the morning.But the boiler does not light. it stay on for around 10 minuets then goes off. it does this 3 or 4 times then it is ok
The system is timed to come on at 8am and to go off at midnight.
Does anyone know what the problem is??

Denbo
February 2011
ravenheat csi85-csi85t

Denbo
February 2011
make and model of boiler

k
February 2011
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