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'73 furnace pilot won't light
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Thomas C. Mencher
Posted 2018-10-16 9:38 AM (#5914)
Subject: '73 furnace pilot won't light


Contributor


Location: New York City
The pilot light on my '73 fmc won't activate to allow the furnace to start. Any advice? I have tried lighting it manually with no success. Also the manual shows a pilot gas turn-on switch which I can't locate. Any suggestions?
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LCAC_Man
Posted 2018-10-16 10:07 AM (#5915 - in reply to #5914)
Subject: Re: '73 furnace pilot won't light


Elite Veteran

5001001001002525
Location: Oceanside, CA
sure your thermostat has power and is working?
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Thomas C. Mencher
Posted 2018-10-16 10:19 AM (#5916 - in reply to #5915)
Subject: Re: '73 furnace pilot won't light


Contributor


Location: New York City
Not sure if the pilot has power. But shouldn't it open manually with a lighter? Another question: the dash indicatoholding tank indicators are not working. Any suggestions?
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B. Sitton
Posted 2018-10-16 10:27 AM (#5917 - in reply to #5916)
Subject: Re: '73 furnace pilot won't light


Extreme Veteran

100100100100
Location: Ignacio Colorado
Does the heater fan come on? It has to spin fast enough to trip a switch that turns on the gas. If the battery is low it won’t trip the switch. I’ve read that well water won’t trigger the tank indicator. Chlorinated water does. Just in case you have well water.
Bill
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Thomas C. Mencher
Posted 2018-10-16 10:27 AM (#5918 - in reply to #5915)
Subject: Re: '73 furnace pilot won't light


Contributor


Location: New York City
Not sure if the pilot has power. But shouldn't it open manually with a lighter? Another question: the dash indicatoholding tank indicators are not working. Any suggestions? Thank you very much for your help.
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LCAC_Man
Posted 2018-10-16 10:34 AM (#5919 - in reply to #5918)
Subject: Re: '73 furnace pilot won't light


Elite Veteran

5001001001002525
Location: Oceanside, CA
like Bill said, if when you turn the thermostat up the fan motor doesn't come on then you'll never get the gas switch to turn on...mine doesn't have a "pilot light" it has an electric igniter but it was a replacement unit in the early 1990's.
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Thomas C. Mencher
Posted 2018-10-16 10:35 AM (#5920 - in reply to #5917)
Subject: Re: '73 furnace pilot won't light


Contributor


Location: New York City
Thanks very much for your answer. I am going to check the fan.
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Thomas C. Mencher
Posted 2018-10-16 10:46 AM (#5921 - in reply to #5919)
Subject: Re: '73 furnace pilot won't light


Contributor


Location: New York City
So, in order for the gas to turn on the the thermostat has to be turned up and the fan has to be running?8
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LCAC_Man
Posted 2018-10-16 10:48 AM (#5922 - in reply to #5921)
Subject: Re: '73 furnace pilot won't light


Elite Veteran

5001001001002525
Location: Oceanside, CA
yes
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Thomas C. Mencher
Posted 2018-10-16 10:55 AM (#5923 - in reply to #5922)
Subject: Re: '73 furnace pilot won't light


Contributor


Location: New York City
Excellent!! Winter is on its way here in NYC. I am going to use your advice and check. Let's hope for the best.Thanks so much.
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B. Sitton
Posted 2018-10-16 4:19 PM (#5924 - in reply to #5923)
Subject: Re: '73 furnace pilot won't light


Extreme Veteran

100100100100
Location: Ignacio Colorado
When you turn the thermostat up above ambient temp the fan turns on. It has to blow enough air to trip the fuel cutoff and send gas to the burner. There is also an over temp gas cut out switch that might be bad but the fan would still blow.
This is how the factory heater in #902 works. No pilot light but an igniter and gas cut off switch.
Bill
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Thomas C. Mencher
Posted 2018-10-16 5:13 PM (#5925 - in reply to #5924)
Subject: Re: '73 furnace pilot won't light


Contributor


Location: New York City
Thanks so much, Bill. I can't wait to get up to the Bronx and try your suggestions. You are very knowedgeable.
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