Furnace Problem

Jun 10, 2004 5 Replies
J

Hi



I have a Lennox Wisper Heat Central Forced air natural gas furnace model # G20RQ3XE-75-1 with a problem



The problem is this



Turn on thermostat igniter clicks after a few seconds small flame appears igniter keeps clicking blower fan turns on blowing cold air



igniter keeps clicking for a few minutes with small flame present , large burners never turn on.



after a few minutes the igniter stops clicking and the small flame goes out.



is there a small primary burner what I am seeing and a larger secondary burner that never turns on? what would cause this.



I have a dvm and am handy, can perform tests and checks.


Thanks James


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T

Hi, If flame is on, flame sensor should sense it for next sequence of event. Doesn't controller give trouble code by way of blinking LED light? Tony

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J

Controller doesn't have a LED light.

Also, problem existed for a week then the furnace started to work again, now it doesn't work.

Thanks James

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T

Hi, Flame sensor tends to get sluggish when surface rust builds up. Clean it with emery cloth of fine sand paper. Tony

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S

You getting 24v at the gas valve? Sounds like a bad solenoid on the gas valve. Of course, I'm not there to see.

Please remit $47.50 for advice.

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S

There may be a sensor in the pilot flame. The one I worked on this year had a bad flame sensor in a Bryant. It would flame up, and the main flame would go out after a second or two.

Not enough to heat the house.

Sears gets about $203812093801238.99 for them. I got one wholesale, and charged a good price for it.

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