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Older GE furnace not firing up

4K views 6 replies 4 participants last post by  jax1lightning 
#1 ·
I have a GE furnace from 1977
Model # BLU 100C93OBO

The pilot light stays lit but the unit won't fire up.

I have jumped the red and white wires on thermostat(nothin) and replaced it.

I have replaced the Thermocouple, Gas valve and Transformer

& checked the high limit switch.

I have 120 V electricity to the unit and 24 v to the gas valve.

I have checked the fusable links all good.

No door switches or flame out switch??

Now what can I do next??
 
#5 ·
Jax you should get that unit checked by a Pro. MOST of them the heat exchangers are cracked and can produce CO Carbon monoxide. By the time a CO detector blows you have breathed a lot of it in. They are designed/meant for catastrophic failures/blocked chimneys etc.
 
#6 ·
LOL... I hate when a new I install has the gas valve turned off, and I don't notice it.

OP. Also, are you checking the 24 volts at the gas valve by reading across it. Or by reading each terminal to ground or common?
 
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