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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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Posted on Jan 02, 2017

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1 Answer

I have a riello burner 40 it will fire and come to temp but wont refire, goes into lockout


My first guess would be that it sounds like a clogged oil filter, air in your fuel line, is piping overhead, or leak in a fitting or connection causing it to loose it's prime when running.

I have also seen primary controls that are faulty do this, watching the complete cycle of the run time will give you more clues as to when the control actually locks out. Does it lock out during the run cycle as the boiler reaches temp.? If so,check for oil line and suction issues as stated above.

If it locks out on start up after reaching boiler set temperature, if hitting reset right away burner doesn't start and lock out occurs with no motor engaging, check motor (Note: Some motors when HOT will not kick in when powered, but after they cool down naturally they start, motor shaft may also be bound up tight, replacement is necessary) if burner motor spins but does not fire, check for fuel flow to the nozzle, be sure oil is pumping to the nozzle, if it is, clean cad cell eye, and check transformer for spark, if all is good.. replace primary control.

Disclaimer:
Of course all this information is technical troubleshooting information and should be performed by a Licensed Technician, not knowing how to properly test for flame failure can cause injury, fire or worse! Consult a technician in your area if you are not proficient at oil burner repair!

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Wiring Diagrams


Check out this site
www.peerlessboilers.com/Products/ResidentialBoilers/
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I have a riello 40 burner it fires for 2 seconds then cuts out what could be the problem


If it actually fires up and you have a flame for 2 seconds and then it shuts off, I'd bet that the photo cell is either dirty or has failed. If it is dirty, it suggests that the burner has been neglected for some time and probably is in desperate need of a tune up. The photo cell is located under the ignition transformer and is aimed into the combustion chamber to see the light created by the flame from the burning oil.

If it is clean, the photocell has likely failed and will need to be replaced. If it still runs the same way after photocell replacement, it is probably related to the primary controller or one of the other safety devices. Is this a forced hot air or hot water system?

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I have a riello oil burner, starts to fire up for a few seconds and fails , fuel is ok any ideas please


i have a riello oil burner 40 F5, starts to fire up for a few seconds and fails , but then it will start for a few minutes...then shuts off... house is not being heated sufficient. There's hot water but after one shower the water starts getting cold....fuel is ok any ideas please

Nov 28, 2009 | SySTOR Systems (400S52) Burner

1 Answer

Burner will run for a couple of hours and then turn off.


They could have disturbed the sludge in the tank when refilling. If you do not have a filter in place it may have clogged the pump or jet and making it hard to start. These need yearly maintenance anyway. The pumps usually have a screen inside and the jet has a screen inside. First,open the bleed on the pump and purge some oil from the line and see if it is flowing freely. If so, the take the drawer assembly out and clean it. Make sure the jet is clear, by blowing through the attached oil line. You should see/feel a fine mist of oil come out. Electrodes should be about 5/32" apart for an F5.

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