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I have a Lennox Furnace

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I have a Lennox Furnace Model # GS190-120-140. The unit will not fire up even after replacing the gas vaulve and the limit switch. The unit blower comes on as soon as the thermostate calls for heat. I have confirmed that the ingnition elect, spark is working. Unit may have been altered due to its age. Need a service manual to check if it is wired correctly and or test it.

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