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I have a Intertherm Mod.#S3QA-042K it has circuit broad in it P/n#Z1704-4D What is this item and what do it do? sboulden1

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Basically it controls the ignition process, and monitors it, it has tob there for the furnace to work properly.

Posted on Mar 12, 2009


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if the unit does blow out cold air for a few minuets then quits it could be a low pressure cut out that will turn off the compressor because the unit is low charged mening there is a leak in the sealed system i would get a second opinion and show them this post

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