E53
Baxi
Gas Valve Modulation / Combustion Control Fault
Boiler intermittently locks out with E53, may relate to gas valve modulation or flame stability
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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
Gas valve modulation coil fault, Incorrect gas valve calibration, PCB modulation output failure, Poor combustion due to blocked burner or injector
How to Fix / Troubleshooting
Critical safety notice: Combustion and gas valve issues must be handled only by Gas Safe engineers.
User checks:
- Do not attempt to adjust gas settings.
- Reset the boiler once and observe if the flame appears stable (if visible through a viewing window).
Professional actions:
- The engineer will perform a combustion analysis, test the gas valve modulation, and clean the burner if necessary.
- They may replace the gas valve or PCB and recommission the boiler.
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Repair Difficulty
Professional Required
5/5
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