Lennox · PRODIGY 2.0 Unit Controller
This error code is displayed when the gas valve for gas heat section 1 is energized and then de-energized three times (default setting) during a single heating demand.
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Check the setting of Parameter 73 (MAX GV SENSE OCC) for the number of allowed occurrences.
Inspect the gas valve and related ignition components in section 1.
Ensure consistent heating demand signals.
Consider adjusting Parameter 73 if appropriate and understood.