Furnace displays E09; often related to gas valve or flame control anomalies.

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

Gas valve not opening fully, Faulty modulation coil, Incorrect gas valve wiring, Control board output failure

Safety first: Turn off gas and power. Gas valve work must be done by qualified personnel.

Visual and wiring check: Inspect the gas valve for damage and ensure all electrical connectors are secure.
Check supply pressure (technician): Have a professional verify inlet and outlet pressures and valve operation.
Reset furnace: After checks, restore power and gas and reset. If E09 returns, the gas valve or control board likely needs replacement and full combustion checks.

Professional Required 5/5

Gas Valve Assembly

Check Price on Amazon

We may earn a commission from links on this page.