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Fan & Pump running?

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??

The boiler is a Ravenheat CSI85-CSI85T

Denbo
February 2011

Ravenheat Heating, Home Heating Systems Fan Boiler 10

it's a shot in the dark but the only thing i can think would cause this problem is the timer especially if it's on the boiler the timer has 6 on - 6 off periods and it may be switching on the boiler for a second each period this would be long enough to start pump, fan but not long enough to light burner suggest you review times on programmer and try by altering time to reproduce fault hope this helps

brian
February 2011

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