Dimplex
Domestic Hot Water Temperature Control Issue
Boiler runs but hot water temperature at taps is inconsistent or too hot/cold
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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
Scaled Dimplex plate heat exchanger, Faulty Dimplex DHW NTC sensor, Incorrect DHW temperature setting on Dimplex control panel, Faulty thermostatic mixing valve on cylinder or outlet
How to Fix / Troubleshooting
Safety first: Risk of scalding from excessively hot water. Test water temperature carefully.
User checks:
- DHW setpoint: Check and adjust the DHW temperature setting on the Dimplex boiler control panel.
- Flow rate: Avoid running multiple hot taps simultaneously if the boiler is small; this can cause temperature swings.
Professional repair:
- Descale or replace the Dimplex plate heat exchanger.
- Test and replace the Dimplex DHW NTC sensor if readings are unstable.
- Service or replace any external thermostatic mixing valve.
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Repair Difficulty
Medium
3/5
Required Part
Dimplex plate heat exchanger
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