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jax1lightning 10-23-2010 06:23 AM

Older GE furnace not firing up
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??

yuri 10-23-2010 07:03 AM

Check the orifices where the gas enters the burners for spiders web/egg sacks blocking them. Apparently that happens in some areas.

kenmac 10-23-2010 09:37 AM

Turn the valve from pilot position to the ON position

yuri 10-23-2010 10:24 AM

It's always the basic things that trip you up.:laughing:

yuri 10-23-2010 10:27 AM

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.

beenthere 10-23-2010 11:29 AM


Originally Posted by kenmac (Post 521750)
Turn the valve from pilot position to the ON position

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?

jax1lightning 10-23-2010 05:26 PM

GE Unit
Thanks the Unit is cracked so I'm not wasting any more
time on it.

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