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Old 04-11-2009, 06:36 PM   #1
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Lennox furnace.help


I have a lennox gcs26-036-75-2pa, when you turn on the heaeter
the ignitor sounds like it humming but i cant see a arc. It also seems as though that when it signals for the ignition it stops and then the gas turns on after the ignition stops . Please
help. What controls the timing between the spark and gas.
Please help.

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Old 04-11-2009, 06:48 PM   #2
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Yuri is the dave lennox man here .. Not sure if you have hsi, direct spark, or smart valve for ign

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Old 04-11-2009, 06:54 PM   #3
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[quote=kenmac;258493]Yuri is the dave lennox man here .. Not sure if you have hsi, direct spark, or smart valve for ign[/q
NOT SURE HOW CAN I TELL ITS A 1995
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Old 04-11-2009, 06:57 PM   #4
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Not sure how do you tell
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Old 04-11-2009, 07:01 PM   #5
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Can you hear it spark on a call for heat or can you see something glow red inside by the burners
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Old 04-11-2009, 07:06 PM   #6
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It sparks across two metal rods with a flame sensor behind it
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Old 04-11-2009, 07:08 PM   #7
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is there a pilot on the unit ?? Spark lights pilot , proves flame then main burners come on ??
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Old 04-11-2009, 07:15 PM   #8
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There are gas nozzles that spray into runners, the middle runner at the end has a electric arc in front of runner with gas going through the runner and hitting the arc of electricity. I have it worked on several times and
today i installed a new ignitor( i guess is the name part that
sparks and not working. Before when heat guy came out whe watched it ,gas looked as if it was spraying right on the flame but nothing was happening and then sometimes it would work now nothing at all.

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Old 04-11-2009, 07:20 PM   #9
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you can see it sparking but not lighting the gas ?? Or just not sparking ?? Sorry for all the questions But I 'am tryng to determine the ignition of this furnace
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Old 04-11-2009, 07:24 PM   #10
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i appreciate the time. i have been told that you may not be able to see the spark during the day due to the intensity of the bluid light, but as of
early today after i replaced ignitor i cannot see a spark, only here it like
electricity arcing.
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Old 04-11-2009, 07:27 PM   #11
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sound like you don't have the gap set right or it's not lined up with the burner to light
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Old 04-11-2009, 07:33 PM   #12
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is the gap already set when you buy a new one, or what should it be. when the heat guy was here he thought that and reset set the gap and
afterwards we watched in amazment as gas sprayed on a bright blue arc in the center of the gas nozzle and nothing seem to happen. low gas
pressure through valve, or weak spark?. and when you here the noise like its trying to spark it stop befor gas starts to spray.
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Old 04-11-2009, 09:01 PM   #13
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could be the box/ board that controlls the spark.. If gas comes into the chamber & doesn't ignite.. It could be weak spark. The spark should be anywhere in the 10,000- 12,000 volt range.. , you should be able to see the spark
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Old 04-11-2009, 09:05 PM   #14
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I just went back out and tried it. It will have a light arc for about a half a seconde and then go away. Then right after gas
comes on i think the spark doesnt last long enough and is weak. Doesnt the board control all of that.
HOW LONG SHOULD SPARK ARC ARC ROD FOR? I THINKG LONGER THAN A SPLIT SECOND. IT SEEMS THAT IT DOESNT SPARK LONG ENOUGH FOR GAS TO ENGAGE ANDTRAVEL THROUGH PASSAGE.

Last edited by MR. GOODWRENCH; 04-11-2009 at 09:09 PM.
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Old 04-11-2009, 09:26 PM   #15
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Quote:
Originally Posted by MR. GOODWRENCH View Post
I just went back out and tried it. It will have a light arc for about a half a seconde and then go away. Then right after gas
comes on i think the spark doesnt last long enough and is weak. Doesnt the board control all of that.
HOW LONG SHOULD SPARK ARC ARC ROD FOR? I THINKG LONGER THAN A SPLIT SECOND. IT SEEMS THAT IT DOESNT SPARK LONG ENOUGH FOR GAS TO ENGAGE ANDTRAVEL THROUGH PASSAGE.


Yes the board or box( which ever you have ) controls the spark.. It should have a good strong spark & should spark long enough to ignite the burners ( with correct gas pressure).. Once burner flame is proved The spark should stop..If the gas is comming through at the correct pressure & it doesn't ignite within a few seconds, gas flow & spark will stop untill all gas is purged from the unit.. It should try again.. Most will try 3 times b-4 lock out. If this happens you will have to re- set the unit.. You might also check the wire to ine ignitor make sure you have good connection/ wire in good condition/ ground


Last edited by kenmac; 04-11-2009 at 09:34 PM.
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