gas furnace wont shut off

[taziztheman2001]

i have an older furnace, unsure of make, and probably from the 70's. when i light the furnace and turn it on it will not shut off. the pilot has been cleaned and a new thermocouple installed. the repair man from my gas company says the problem is with the thermostat and there is nothing he can do. i have a new hunter brand thermostat installed and also ran new thermostat wire to the furnace and i still have the same problem. i am having to "babysit" the furnace by turning it to on and letting it run a little while then turning it back to pilot. what can i do to fix this?

[taziztheman2001]

the furnace is made by duo-therm model number 76003-2

[Robert]

Hi,

Test the t-stat to see if it gives a no call for heat once satisfied.

When room temp is reached, see if gas valve is still receiving voltage, most likely 24vac depending on furnace.


Thanks,
Robert

[taziztheman2001]

we finally got a repair man out here and unfortunately the problem is my valve is stuck open. he is looking for parts but unsure if he can fins anything that old

[Robert]

Hi,

See if this is what is needed:

http://www.hvacpartstore.com/product_de ... cts_id=151



Thanks,
Robert

[taziztheman2001]

it doesnt look like that one. the power wires and on/pilot/off knob and gas in are on the right side, gas out and thermocouple are on the left. the front has something that almost looks like a cap that is round and roughly 2" wide

[Robert]

Hi,

Doubtful you'll find an exact replacement that looks the same. The location is not that big of an issue, it can be repiped to work fine.


That is only Duo-Therm gas valve we have or know of.


Take care and best wishes,
Robert

[taziztheman2001]

ok thanks

[Robert]

Hi,


You're very welcome, happy to help.



Thanks,
Robert