Dimplex
Flame Detection Instability
Boiler starts then shuts down after a few seconds without showing a specific error code
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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
Contaminated Dimplex flame sensor (ionisation electrode), Poor earth connection to Dimplex boiler, Incorrect gas pressure at Dimplex gas valve, Partially blocked burner on Dimplex combustion assembly
How to Fix / Troubleshooting
Safety first: Gas and combustion components must be serviced by qualified personnel only.
User checks:
- Power reset: Perform a full power cycle and observe if the behaviour repeats.
- Flue terminal: Ensure the Dimplex flue terminal is clear to avoid combustion issues.
Professional repair:
- Clean or replace the Dimplex flame sensor and check electrode gap.
- Verify earth continuity and bonding to the Dimplex boiler chassis.
- Check burner and injectors for contamination and clean as required.
- Measure and adjust gas pressure at the Dimplex gas valve.
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Repair Difficulty
Professional Required
5/5
Required Part
Dimplex flame sensor (ionisation electrode)
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