E16
Baxi
Modulation / Output Control Fault
Intermittent E16 error, unit may cycle on and off rapidly or fail to modulate correctly.
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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
Faulty modulation control on Baxi PCB, Defective gas valve modulation coil, Incorrect feedback from temperature sensors, Wiring fault in modulation circuit
How to Fix / Troubleshooting
Safety: Modulation faults affect combustion; only basic visual checks should be done by the user.
User-level:
- Reset and observe: Reset the heater and observe operation. Note if the burner cycles rapidly or if water temperature swings widely.
- Check for loose connectors: With power off, inspect and reseat connectors to the gas valve and temperature sensors.
Professional: A technician must test modulation signals, gas pressures, and replace the gas valve or PCB as necessary.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Modulation Circuit
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