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I have a Lennox Furnace Model # GS190-120-140. The unit will not fire up even after replacing the gas vaulve and the limit switch. The unit blower comes on as soon as the thermostate calls for heat. I have confirmed that the ingnition elect, spark is working. Unit may have been altered due to its age. Need a service manual to check if it is wired correctly and or test it.

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Pull off all of your thermostat wires from the control board and make sure you dont have a shorted wire. if the fan still runs you could have a few other problems maybe a stuck relay in the motherboard control try to tap it on the little black boxes.

Posted on Jan 05, 2009

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Bought a house with Lennox G12Q3-82-3 furnace. It doesn't look like electronic ignition. A sticker showing AirMedic Electrostatic Air Cleaner says it was installed 10/1992. Doesn't work.


Here's some borrowed info.:
`These are classic symptom of a limit switch opening. Can't guarantee that is what is going on, but here is some things that can cause the limit switch to open:

1) Low air flow. This can be caused by dirty filter, dirty blower wheel, dirty air conditioning evaporator coil, restricted or collapsed ductwork, blower motor running the wrong direction, blower running on too low of a speed, defective limit switch, or a combination of several of these factors. Inspection along with measuring the temperature rise will find most of them.

2) Heat exchanger failure. Split or burned through heat exchanger

3) Over-fired furnace. If you have eliminated everything in section 1 and 2, and the temperature rise through the furnace is still high, you need to check the furnace to make sure it is not burning more fuel than it is designed to burn. If it is a natural gas furnace, you can check the amount of fuel that is being burned by clocking your gas meter.

Here is a link that will tell you how to use your gas meter to calculate the BTU input of your furnace. It should never be more BTU than the furnace's rated input.
http://www.bacharach-training.com/referpage/clocking_gas_meter.htm

The problems you have could be potentially hazardous. If you are not able to aggressively find the problem on your own, you should hire a professional to look at the furnace immediately. The G12 furnace is getting relatively old. If you have never had it professionally inspected (sounds like you haven't), you probably should have a professional look at it immediately.' END QUOTE
This might cover your problem? don-ohio (:^)

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1 Answer

Furnace blower won't turn on


You may need to replace the sail switch. It senses the fan speed and when it connects the gas valve should open and furnace should fire up.

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What is the model number? I have an SLP98 (installed on 11/29/2011).... and if I take the cover off the front of the furnace the panel that has the fancy "Lennox" badge on it) you will see two clear round windows about the size of a half dollar (one high on the furnace box and one lower on the blower box.) If you look downward into the window on the blower box you can see a red LED display that will sometimes flash error codes like E228 (one character at a time). If your model has something like this, let me know. I've done some DIY fixes recently out of necessity....and their easy.....and several technicians confessed they didn't know much, if anything, about the newer high effieciency Lennox gas furnaces.

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1 Answer

Furnace blower runs continuously but no heat


sounds like the furnace control (low voltage) circuit is open, or in other words you either have a fuse blown or a limit switch that needs to be reset. Most newer furnaces have a small knife like fuse, usually 3 or 5 amp located directly on the circuit board. Limit switches that have a manual reset are usually located in the fire box just above the burner. There may even be a limit switch located on the blower assembly. If you fuse was blown, you may need to find out what caused the short in the circuit or it will do it again. If the limit switch was tripped, you need to turn the furnace back on and watch the flame to see if there is "roll out". It it continues to trip or blow fuses you need to have the unit serviced.

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I have a Coleman Evcon gas (propane) furnace. When the t-stat is switched to heat the furnace heats up but the blower will never turn on. The unit then shuts down and tries to cycle again. I have replaced...


If the unit fires but the main blower fan doesn't come on the the unit is shutting off on a temp high limit switch and it sounds like the problem is the main blower fan motor or control

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1 Answer

My Lennox G10R03-110-1 heat unit, will not light the burners even though the pilot light is lit, and the thermocoupler was just replaced today


Hi,
You have a pretty old Lennox there. The G-10's went out of production many years ago....
Since you have pilot and the thermocouple was replaced you will need to check and see if there is voltage going to the gas valve. You should have 24v AC across the two wires on the gas valve when there is a call for heat. If not then the limit switch or the high limit switch are cutting the power to the gas valve. You will need to reset or replace them.
If you have power to the gas valve then you have a
faulty gas valve and will need to replace that.
It if very possible that the gas valve has failed on a furnace the age of yours. That would be my first guess. But do check for voltage before replacing it.

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

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