E09
Weishaupt
Gas Valve Control Fault
Display shows E09; unit may lock out after several failed ignition attempts.
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Safety Warning
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.
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Possible Causes
Defective gas valve coil, Loose gas valve connector, Faulty control board gas output, Internal gas valve blockage
How to Fix / Troubleshooting
Safety: Turn off gas at the main shut-off and isolate electrical power. Only qualified gas technicians should work directly on gas valves.
- Check electrical connection: Locate the gas valve on the Weishaupt water heater and inspect its electrical connector. Ensure it is fully seated and free of corrosion.
- Wiring inspection: Trace the wiring harness from the gas valve to the control board, checking for damage or loose plugs.
- Gas supply check: Confirm that the upstream gas filter and regulator are not blocked. This step should be done by a licensed gas fitter.
- Professional testing: A technician can measure coil resistance and verify that the control board is sending the correct voltage to the valve during ignition. If the valve does not open, it must be replaced with a Weishaupt-approved gas valve.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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