40
Vokera
General Lockout / Multiple Fault Condition
Boiler shows 40, no heating or hot water, may indicate lockout due to repeated faults
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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
Repeated ignition failures, Persistent overheat, Sensor faults not cleared, PCB safety lockout
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset a boiler that continually locks out; this can be unsafe.
- Single reset: Perform one reset as per the manual and observe the sequence. Note any other codes that appear before 40.
- Record symptoms: Note noises, flashing lights, and behaviour to inform an engineer.
- Engineer diagnosis:
- Access boiler diagnostic history (if available) to see underlying fault codes.
- Systematically test ignition, sensors, pump, and flue components.
This code usually requires professional diagnostic tools and should not be ignored.
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Repair Difficulty
Professional Required
5/5
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