State Communication Error Between Gas Control and Blower/Interface

State electronic gas tank-type water heater LED flashes E9; unit may not operate.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose communication harness, Damaged wiring, Faulty gas control or blower control module

Safety: Disconnect power before handling control wiring.

Inspect harness: Trace the low-voltage communication cable between the gas control and blower/interface. Ensure connectors are fully seated.
Check for damage: Look for pinched, cut, or chewed wires. Repair or replace as needed.
Module replacement: If wiring is intact and E9 persists, either the gas control or blower control module may be defective and should be replaced with OEM State parts.

Hard 4/5

Blower Control Module

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