E17
Dimplex
Flow/Return Temperature Differential Fault
Boiler shows E17; display may indicate sensor mismatch; boiler may run at reduced output
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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 Dimplex return NTC sensor, Poor circulation due to partially closed valves or undersized pipework, Blocked Dimplex system filter or heat exchanger, Incorrect pump speed setting
How to Fix / Troubleshooting
Safety first: Turn off power before accessing sensors or pump controls.
User checks:
- Radiator valves: Ensure all radiator and isolation valves are open.
- System filter: If a user-serviceable filter is installed, clean it according to instructions.
- Reset: After improving circulation, reset the boiler and monitor performance.
Professional repair:
- Test Dimplex flow and return NTC sensors and replace any faulty units.
- Balance the heating system and adjust Dimplex pump speed.
- Clean or replace blocked Dimplex heat exchangers.
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Repair Difficulty
Medium
3/5
Required Part
Dimplex return NTC temperature sensor
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