18
Intergas
Mains Supply / Low Voltage Fault
Boiler shows code 18, may be associated with low voltage or power issues
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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
Supply voltage below specification, Loose mains connections, Shared circuit with heavy loads causing dips, Internal power supply fault on PCB
How to Fix / Troubleshooting
Safety first: Isolate power before opening the electrical connection box.
Steps:
- Check mains connections: Ensure live, neutral, and earth connections at the Intergas boiler terminal block are tight and correctly wired.
- Measure voltage (technician): Use a multimeter to confirm that the supply voltage is within the range specified by Intergas under load.
- Dedicated circuit: If the boiler shares a circuit with large appliances, consider moving it to a dedicated circuit to avoid voltage dips.
If the external supply is stable but code 18 persists, the PCB's internal power supply may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Intergas main PCB
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