Gas forced air furnace takes igniter awhile to ignite when cold


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Old 12-05-11, 11:39 AM
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Gas forced air furnace takes igniter awhile to ignite when cold

Hello,
When gas forced air furnace has been off for long time and then turned on, Igniter takes about 45 sec to ignite flame. I hear the igniter working until its done its job. When system is used again maybe within the half hour and sooner it does ignite fairly quickly. Needed to change ignition control last year due to bad wire. Bought Honeywell to replace old Johnson Control. Worked OK last year after control change. Then when used for first time this winter season it would not ignite, so cleaned igniter and relaced flame sensor and now have the described symptom. This is a Lennox G20 system.

Any ideas are greatly appreciated!

Thx
 
  #2  
Old 12-05-11, 11:48 AM
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Take the cover off the burner compartment of the furnace. Describe in order and in detail the sequence of events you observe when the thermostat is turned up.
 
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Old 12-05-11, 01:44 PM
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After thermostat senses cold, damper door opens, then about minute later a series of uniform clicking sounds , which I presume is igniter, goes on for about 30sec to 45 sec when unit has not been used for more than about half hour , then another click, which I presume to be gas valve letting unit turn on almost immediately. Furnace seems to heat house adequately. If unit cycles on more frequently, say every 5 minutes, igniter can be heard for only a few seconds, then furnace turns on.

Thanks for any other advice!!
 
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Old 12-05-11, 02:09 PM
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Is the ignitor a pilot light which lights and the clicking a spark to light the pilot? If not please describe what you see and hear in more detail.
 
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Old 12-05-11, 02:26 PM
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Yes, the clicking is the spark to light the pilot.

Thx for any input!
 
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Old 10-05-12, 10:32 AM
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still having issue

Hello,
still having same issue, except now takes about 90 seconds to ignite.

Thx for any input!!
 
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Old 10-05-12, 01:08 PM
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remove the pilot and clean it and the orifice.
 
 

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