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Old 11-26-2011, 11:40 AM   #1
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I have a Ward floor furnace circa 1952. The thermostat is not working properly.. It is a milivolt sys. To replace the thermocouple do I have to crawl under the house?

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Old 11-26-2011, 11:58 AM   #2
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Thermo couple


How do you know the problem is the thermalcouple?

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Old 11-26-2011, 12:34 PM   #3
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Thermo couple


jump R to W at the subbase before going down and bring some matches along can you see a pilot flame from the floor looking into it i you have a pilot running jump the gas valve out were the stat wires connect should lite...if no action the milli volt gen element is shot...all this jumping from the stat down tot he valve will verify the wie run and if its the valve or millivolt gen element

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Old 11-26-2011, 01:48 PM   #4
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Thermo couple


also check the condition of the pilot flame make sure it if in full contact with the tpilot not just barely touching the sensor
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Old 11-26-2011, 01:56 PM   #5
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if you have a multi meter remove the thermocouple with a gas stove or flame ..put the tip the pilot hits you can read (both leads in and outer on the screw in piece) the signal that the valve actually looks for to "lock up" (proof the pilot flame is present) so it opens.... on any system no mattr what the electronics you have to have a pilot flame proof to check the main gas action...no matter how many bells and whistles they have off a board.a simple wipe of steel wool on a probe and your heating again.pays to have a thermocouple spare NAILED to the wall above the furnace when its 10F outside and the winfd is banging your castle at 30 MPH at 2AM in the morning

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Old 11-26-2011, 04:26 PM   #6
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Thermo couple


Hey nonesuch.
How do you know the thermocouple is the problem? Can you see or hear the pilot burning? If all you know is that the thermostat doesn't get your unit to work then I'd first make sure with a millivolt system that all electrical connections on the thermostat and the gas valve(if you can reach it } are tight. With a thermostat from 1952 I'd also try testing by pigtailing the two electrical connections at the thermostat before bellycrawling under your house.

Last edited by how; 11-26-2011 at 04:28 PM.
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Old 11-27-2011, 12:15 AM   #7
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You state its a millivolt system. Do you have a therompile?

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