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No spark Ignition, no gas release from the valve.

This is GCS16-1353-270-5J (Lennox packaged unit). Blower fan works. Ignition doesn't work at all. No clicking sound from gas valve at all. any idea?

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  • joship Jan 31, 2010

    This is a forced draft spark ignition packaged unit. So when i turned it on, blower fan starts working, draft fan starts and that's it. Nothing else happens. There is no pressure switch here.

  • Ken Bledsoe May 11, 2010

    Sounds like the control box is bad. It controls the spark to the pilot light and then opens the gas valve. With out being there kinda tuff to determine the right problem.

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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.

Posted on Jan 31, 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.

Mar 23, 2014 | Heating & Cooling

1 Answer

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

For some reason the heater does not generate heat. the fan works but no heat. Any Ideas?


I've got an easy way for you to check, and then we can help you from there.
First pop open both lids to your furnace (this may require a screwdriver). Turn up your thermostat, push the safety interlock button in if it has one (it's a button that turns off the power when the doors are removed), and watch.

On most modern furnaces (past 20-25 years) you'll hear/see:
1. Inducer fan
2. orange glow (ignitor)
3. Gas valve opening and ignition (flames)
4. Main Fan.

that's normal heater operation.
The most common issue here is a burned out ignitor, in which case you wouldn't see the orange glow but the sequence would attempt to continue anyway (the gas valve will open and hiss gas, but it won't lite, then it'll give up and try again a few minutes later).

On older furnaces there's a pilot light to start with, the click of the gas valve and boom... ignition.

On new furnaces it's
Inducer fan
gas valve opening
spark - ignition
Main fan.

and there are some oddballs in between, particularly the Lennox Pulse. If that's your furnace just back away slowly and call a professional... some guys won't even touch those, so be sure to mention what it is... if you call a pro.

So go ahead and watch it run, then tell me/us what you see.

May 06, 2011 | Bionaire Heating & Cooling

1 Answer

Looking for sequence of operation for a lennox mid efficient furnace


When there is a Call for heat, the control delays ignition until combustion air

Blower operation has been proved and pre-purge period

Has elapsed. It then opens the gas valve and generates a

Spark to ignite the burners. Trial for ignition lasts for 7 seconds.

At the same time, the control begins monitoring the

Flame sensor. If the flame current is too weak (less than 1

Micro amp) or if the burners do not ignite (within the 7 second

Ignition trial), the control will shut off spark and the combustion

Air blower and de-energize the gas valve. Flame

Current should be between 1 and 5 micro amps to keep the

Gas valve open.

The control will attempt to ignite the burners up to two more

Times. Each time the control restarts the ignition sequence,

It begins with a 45 second pre-purge. If flame is not sensed

After the third trial, the control locks out. Lockout means that

The control shuts off the gas valve, spark and combustion air

Blower for 60 minutes. At the end of 60 minutes the control

Completely resets and will attempt ignition up to three times.

The control can be manually reset before the end of 60 minutes

By momentarily turning off power to the unit.

here is a link to an operations manual

http://0190acd.netsolhost.com/manuals/80MGF_Series.pdf

Nov 25, 2010 | Heating & Cooling

1 Answer

My Lennox gas furnace runs for approximately two minutes and shuts off. Normally the blower runs for a few minutes but no longer is this the case. My furnace repair man cleaned the flame sensor and it...


if the unit has a flame (gas valve opening)the problem may be the fan going bad or fan relay -- sounds like unit going off on high limit control

Nov 01, 2009 | Heating & Cooling

2 Answers

Blower turns on when stat calls for heat but manifold is not being ignited (do not hear gas valve even trying to release gas). No spark either. Could it be insufficent gas pressure?


Here is the ignition sequence for a spark ignited furnace. This will help you understand what is happening/not happening.

Thermostat calls for heat.

draft inducer motor (DIM) starts drawing draft through heat exchanger.

Pressure switch detects proper operation of DIM, and sends signal to board to begin ignition.
(it detects negative pressure)

Ignitor starts ignition attempt and gas valve sends gas to burners.

Upon ignition, flame sensor detects flame and sends signal to board stopping ignition sequence and continuing gas flow for heat mode operation until thermostat is satisfied.

During this sequence the blower motor is brought on, and by using a series of temperature limit switches, the system assures that the unit is operating properly.
(If the blower is not operating, or the airflow is inadequate, the heat exchanger will overheat and trip one or more temp limit switches.)

There is also a "rollout" switch that detects improper flame pattern "rolling out" into the controls compartment.

Now, to apply that to your situation.

If you have no spark, than the failure is happening before the gas is supposed to be flowing.

That usually means a failure at the D.I.M. Typical causes for that are a clogged flue pipe/vent, damaged/deteriorated fan blades, bad fan, or bad pressure switch.

If one of the temp limit switches or rollout switches have tripped, it will simply shut off the system.
(Some units will turn on the blower motor and shut down everything else.)

You can try resetting the unit by disconnecting power for 1 minute, and attempting a restart.

First look for any flashing LED lights. If you see any locate the wiring schematic (usually on the inside of the front panel) and look for the flash codes.

If the reset does not solve the problem, let me know what flash code you are getting, and/or let me know exactly what you see the furnace doing, in detail, after the restart.

Oct 03, 2009 | Weather King 12AJA4801AH Air Conditioner

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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