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Lennox g26-75 fan not turning on in automatic mode

Recently replaced the Johnson ignition control module with Lennox 30W33 OEM Ignition Control Kit with a new flame sensor. It cured the cycling problems, but now the fan doesn't go on in automatic mode after the furnace fires up. After a few minutes the burners go out. When I put the fan in manual mode, everything works fine. What's up!!

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 85 Answers

SOURCE: Heater no longer works on auto fan, only manual fan

When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..

Posted on Dec 09, 2008

johnsonr1
  • 91 Answers

SOURCE: lennox lf24 garage heater, starts then shuts down.

Here is a link to the manual for your unit heater:

http://tech.lennoxintl.com/C03e7o14l/mk6x6w5J5/503526e.pdf

The 4 flashes is a high limit or roll out switch is open. There are 2 or 3 little brown or black button looking switches with a little button on the top and a wire attached to each side. Press the button on each, you may hear a slight "click". If you do, that is the one that was open. Hope this helps.

Posted on Nov 04, 2009

  • 215 Answers

SOURCE: lennox intermitent flame problem

Yes the flame sensor is not allowing the ignitor to start, you will need to remove the flame sensor, and clean the black carbon build up from the stem of the flame sensor, replace the flame sensor and turn the furnance back on, this will correct the problem.

Posted on Dec 14, 2009

  • 1 Answer

SOURCE: lennox furnace 17 yeanrs old. flame comes on and

I have a Lennox G40UH furnace. The burners fail to ignite about every 5th time. The furnace will try to ignite the burners then shut down. Once in a while the temp will drop down to 62 then fire up. I have only gotten a Diagnostic code once "Watchguard - burners fail to ignite" once I shut the power down and it started.
The furnace is clean, 5 years old, the flue is not clogged.

Posted on Jan 03, 2010

SOURCE: I have Lennox pulse 21 control module light goes out

If this is a high eff model, check to make sure the intake vent is not plugged.

Posted on Jan 18, 2010

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Lennox g26q3


electronic ignition or pilot type? assuming electronic ignition, check the airflow sensor for dirt in the peto tube, or a defective sensor, if you hear the high voltage click but have a failed ignition chec that the pilot is being lit, and that the thermopile/infrared sensor is good. one of those is your problem.

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Your control may a defected relay to the blower under heating mode. If that is the case you will need a new control board or replay.

Feb 05, 2014 | Heating & Cooling

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Lennox furnace model G11Q3-110 v.2 burners light but go out before fan comes on


Troubleshoot an ignition problem on a Lennox gas furnace ...

? 2:44
https://www.youtube.com/watch?v=yXIxgzwMkPs
Nov 17, 2012 - Uploaded by grayfurnaceman
This furnace should light its pilot with a spark then the pilot proves its on ... Troubleshoot an ignition problem on a Lennox gasfurnace .... Pilot and no inducer but is the same model as that great video! ... You probably have dirty burners. ... How do you know spark module is not sending 24 volts to mv and pv ...

Lennox Furnace Model G11Q3-82-2 - RepairClinic.com



Nov 19, 2012 | Heating & Cooling

1 Answer

Lennox gas furnace G21Q4/5-100-1 sometimes won't kick on


Hi check out the flame senser is clean also jump ou tthe pressure switch see if it lights when you do this , igntion modul is just a box with some push on wires just get the right one the info is all on the module

Feb 16, 2010 | Heating & Cooling

1 Answer

No spark Ignition, no gas release from the valve.


I would replace the intermitant spark ignition module if it did not produce a spark from the spark terminal to ground if held 1/8" away. Honeywell makes a universal replacement. I think it is either a S8610U or S8900U.

Jan 31, 2010 | Heating & Cooling

1 Answer

I have Lennox pulse 21 control module light goes out


If this is a high eff model, check to make sure the intake vent is not plugged.

Jan 17, 2010 | Heating & Cooling

1 Answer

Need wiring diag for johnson control #G770-RJA-1


Is this on a Lennox gas furnace? If so you may be able to get one from lennox. Imay have one at work, but I won't be back there until Monday. bryan@reedwrightheating.com

Nov 19, 2009 | Heating & Cooling

1 Answer

Furnace will not heat.


Most of the Lennox G-16s that I have repaired were having problems with the gray Penn-Johnson Piggyback igniton control module.
This is best repaired by replacing the spark module. Sometimes it may be neccesary to replace the gas valve also. Lennox updated to a ROBERTSHAW ignition system. Honeywell can also be used.
Also check that there is no water in the pressure switch or tube.
Hope this helps.
Matt
machtcl1@verizon.net

Jan 13, 2009 | Honeywell Electronic Programmable...

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