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The HVAC system is all under computer control and there is little or no stand alone circuitry. The most common fail with the system is a broken blend door. The computer will detect a fail condition and go into "hibernation" because it doesn't know how to deal with failure. Replacing the blend door will bring the system back to life. Check the information on heatertreater.net for diagnostic information and a repair procedure.

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16y ago

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