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Riello 40 F5 oil burner, on boiler, intermittently running

This is 14 months old. Just recently it would not start. I took out the Drawer Assembly (the igniter electrodes and fuel nozzle assembly), and found that the slotted disc, at the end, was very sooty and clogged up. I cleaned that and checked the nozzle which sprayed fine. The igniter electrode tips were dirty, too. Cleaning this assembly allowed it to run but when it tries to start it will cycle ten or twenty times before the fan runs and it ignites.
Those familiar with this oil burner will know that there is a disc, air valve which rotates and allows the blower fan intake port to be exposed. This valve rotates closed when it shuts down. In the startup cycle this disc rotates to the open position. This is when the blower fan should start and the burner should ignite. Yet, the disc continues to rotate and does not stop turning. If anything happens at all, intermittently, the fan runs briefly for a fraction of a second. This sounds like a weak or strong wheeze. When the fan decides to run and stay running, the disc stops turning, and the fan runs for about four seconds before it ignites.
Why is the burner having such a hard time coming on? If the fan runs, without hesitation, it ignites, runs and finishes its cycle properly.

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With a forced draught burner the fan motor would be checked via a pressure switch. if the pressure switch is not set correctly or the fan is too weak the contacts will not be made in the switch and the burner will lockout. if the damper is not open enough when the fan runs then the air supply will be too small for the switch to make. check to see if you have a capacitor on the fan windings if this is faulty then the fan will fail intermittently.

Posted on Mar 26, 2009

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Sounds like a control box fault, but first take out the pump and see if it is turning with out too much resistance, if it is it can be be causing all the spluterring and sooting up.

also the disc can be removed

Posted on Jul 07, 2010

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Hi Can anybody help. I have a Riello 40 oil burner.age17yrs. water somehow got into the oil tank,have cleared the water from the tank and the burner,problem is with the fuel pump I think.cant stop the fuel flow to the jet,cleaned filters"etc"in the pump replaced o-ring valve stem upper and lower also the coil still oil comes from the jet that's with it the burner switched off but the oil line still open.Any help.Thank's

Posted on Jan 04, 2010

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