Question about Heating & Cooling
Only two burners light the the gas valve shuts off
Posted by Anonymous on
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Posted on Jan 02, 2017
If it is an old furnace with a manual pilot light there are pilot lighting instructions usually on a door or panel. If it is 15 years old or newer it probably has either a spark ignition or a hot surface ignitor. These can't be lit manually. If they fail they usually require parts to be repaired.
Posted on Jan 02, 2009
I am concerned of the readings you have given. 120 volts to ground, but 168 volts to neutral? And having 10 amps of current at the "ventor", but only 1 amp for the whole furnace worries me, because power for the "ventor" comes through the furnace.
You should not have 168 volts to anything! Unless somehow 240 volts is feeding the system, and there is a medium resistance short somewhere.
The controller boards are sensitive to AC polarity (if you will). Neutral should be tied to neutral on the board. You can check that by testing for voltage between the neutral terminal and chassis ground (assuming the chassis is properly grounded.). The hot leg of incoming power, which should be 120 volts, should be connected to the terminal that says 120 VAC.
If your getting 168 volts AC somehow, then something is wrong, and you need to disconnect power from this unit until you find the cause.
As a heat-A/C tech, you should know the sequence of operation for all furnaces is pretty much the same. The boards, while manufactured by different manufacturers, all operate pretty much the same way.
Let me know your findings in reply and I will attempt to help you more.
Posted on Jan 20, 2009
I have had problems like this before. Most of the time it is the connection between the burners. There are small slots that the gas runs thru to lite. Clean those with a brush and then try it. Rus
Posted on Oct 04, 2009
Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.
Posted on Dec 21, 2009
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