Dimplex
Intermittent Control or Sensor Fault
Boiler frequently locks out and requires manual reset, with no consistent 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
Loose wiring harness on Dimplex PCB, Intermittent NTC sensor connection, Moisture ingress into Dimplex control compartment, Failing Dimplex PCB relays
How to Fix / Troubleshooting
Safety first: Repeated lockouts indicate an underlying fault. Do not continue resetting indefinitely.
User checks:
- Environment: Check for signs of dampness or leaks around the boiler that could affect electronics.
- Record patterns: Note when lockouts occur (e.g., only on hot water, only in cold weather) to help diagnosis.
Professional repair:
- Inspect and reseat all Dimplex PCB connectors.
- Test sensors and replace any with intermittent readings.
- Replace the Dimplex main control PCB if intermittent faults persist.
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Repair Difficulty
Hard
4/5
Required Part
Dimplex main control PCB
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