Burner runs for 10 seconds starts sparking then motor seems to stop and the sparker keeps running but fan and motor stopped what could it be ? Ive took the pump off and run it it still does the same
The ignition spark should start immediately the burner goes through its 8 second purge......after that the oil is switched on and combustion should start.
It sounds like a control box issue, but perhaps you could be more specific - does flame actually occur?
John
Combustion is maintained courtesy of the photocell, which must always be clean and able to see the flame. This usually takes a few seconds before the burner locks out.
The motor start up is controlled by the capacitor alongside. The motors aren’t high torque and a tight oil pump can stop them.
Ensure that the oil pump retaining screws aren’t too tight - hand tight will do.
You may need to run the motor on the bench, to see that it starts up every time - and it doesn’t stall when you grip the spindle.....and to ensure it has a constant 250v supply.
John
Ok ill take it back out and check its got a constant 240v what could be causing the 240v to not be there ? If i reset it it resets and starts but does the same ive took the pump off the side and ran it it does the same without pump on it
Its getting 240v all the time just tested fan starts up
And runs for say 15 seconds then electrodes start runs for second or less then fan stops and the electrodes still spark for a few seconds then stops but sometimes the fan kicks back in
Power to the motor is directly governed by the control box which does sound like it is behaving spasmodically!
The sequence of operation is:
Burner motor starts up, this is automatically fixed to the fan and the pump and the ignition spark commences. This lasts for around 8 sec and is called the 'purge period'. No oil is being sprayed at this time.
The burner should light up when the solenoid coil on top of the oil pump gets a 250v signal....this opens a valve deep inside the pump. Combustion should continue so long as the photocell can see bright light. The ignition spark then stops.
The burner is now under boiler thermostat control.
A faulty photocell can give bizarre symptoms but generally they are reliable.
John
If you have a multimeter, set to the ohms setting, a photocell should show a very high resistance ( in the M ohm region) when it is in the dark, falling to a low resistance (a couple of k ohms maybe) in bright light.
Of course, we don't know if the control box is responding to it's signal!
John
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