27
Intergas
Modulation / Gas Valve Control Fault
Boiler displays error code 27, burner output limited, poor heating performance
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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 gas valve modulation coil, Incorrect gas valve adjustment, PCB modulation output fault, Blocked burner
How to Fix / Troubleshooting
Danger: Gas valve and combustion adjustments must only be made by a Gas Safe engineer with proper equipment.
- Note symptoms: Record whether the boiler ever reaches full temperature or if radiators remain lukewarm.
- Check other gas appliances: If they work normally, the issue is likely within the boiler.
- Engineer actions: The engineer will measure gas valve modulation signals, check burner pressure, clean the burner, and adjust or replace the gas valve or PCB as required.
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Repair Difficulty
Professional Required
5/5
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