Gas Valve, Safety Or ?

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  #1  
Old 03-10-08, 09:07 AM
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Gas Valve, Safety Or ?

I have a Goodman, 90% eff furnance, GMNT060-3B.
Furnance ignites, but gas valve wouln't open.
Checked all safeties, OK,
Removed 2 wires from gas valve, 24volts present, OK
Replaced gas valve that was under warranty.
Problem still present.
Another tech said that the safety near the blower
motor was bad, he temporary bypassed the the safety and
it working fine now.

Any tips or suggestions on what to check next time I run
into a problem of this nature.

Thanks..
 
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Old 03-10-08, 03:44 PM
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Just post back when you have a particular problem. Or read up on typical furnace operation. There is too much ground to cover for anyone to come on here (IMO) and say you should do this, this and this, and look for this, etc.

Some furnaces have a glow coil igniton while others are by intermittant pilot, or standing pilot, or direct spark to the ignition, and each of these types of furnaces require their own set of diagnostic procedures. Some furnaces have fan switches where heat causes the air to blow and might have an ignition control module, and other furnaces have the heat blow from some timer off a control board. Some older furnaces rely on thermodisc switches. Other furnaces have variable speeds or stages. Etc.
 
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