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Eo2 lockout problem with my weil McLain ultra 105 series 2 boiler. I believe it is the flame sensor as I have no problem with the ignitor. Any suggestions? The boiler goes into lockout periodically and has to be reset.

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SOURCE: My oil boiler is a

The actual final solution was to replace the fuel valve/solenoid following which the boiler has run without failure.
The conclusion was that the fuel valve solenoid was ok when cold but when heated up had some sort of electrical breakdown in its coils, causing the fuel valve to fluctuate until the boiler locked out.

Posted on Oct 17, 2008

  • 108 Answers

SOURCE: I have a weil-mclain CGA-4-SPDN

You need to replace the Thermocouple. (pilot safety device) It would be best to call a Technician about this.

Posted on Oct 22, 2008

  • 833 Answers

SOURCE: How to replace collapsed fire

Your heating supply store will have a replacement unit.  I do suggest you get a pro to do this, however.  Your burner should be tuned and this is not a job for an amateur.

Posted on Nov 15, 2008

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Turn the furnace power off & on. Watch to see if starts. If there is no ignition check ignitor whether spark or hot surface. If there is flame that cuts out, clean the sensor

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Make : Weil-McLain Model : CG-5-SPDN Series 12 I have the above mentioned boiler which is located on the 1st level of a three story one family house, the area where the boiler is located is insulated.


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hey Carli suspect you mean the pilot goes out as soon as u turn your gas control valve back to the on position!? If this is so, you will have to probable reset the flue spill switch located right at the exaust outlet. OR, SOMETIMES THEY HAVE ANOTHER LIMIT switch in the same circuit in series. If the pilot goes out when u release the pilot press down knob, then it is your thermo couple is loose or fininshed,or the pilot flame is not aimed properly at the sensor (thermo couple)

Sep 21, 2011 | Heating & Cooling

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Weil mclain furnace always locks out or latch up have tried button always repeats. oil in tank


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Jun 21, 2011 | Heating & Cooling

1 Answer

Air pressure switch is closed before the ignition sequence causing the boiler not to ignite can you advise solution


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Nov 26, 2010 | Heating & Cooling

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My oil boiler is a Danesmoor SLPJ 20-25 with an Electro Oil Inter 2011 burner. The oil tank ran out and after refilling the burner ran ok for approximately 6 minutes, the control box chattered and the...


you could have a problem with a temperature sensor.
it would not be the flame sensor since it could not wait 6 mins to sense that there is flame in the unit.
could be a temperature sensor problem where it is sensing a temperature which could be correct but it is sending a wrong signal to the controller to turn off the flame and start another cycle.

tnx 4 using fixya,

drcool

Oct 04, 2008 | Heating & Cooling

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