H05
Wiser by Drayton
Heat HubR Over-Temperature or Internal Sensor Fault
Heat HubR or app shows H05; internal temperature or safety sensor in Heat HubR has triggered.
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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
Heat HubR installed in very hot cupboard or above boiler, Blocked ventilation around Heat HubR, Internal sensor failure, Power component overheating on PCB
How to Fix / Troubleshooting
Safety: Isolate mains power before touching the Heat HubR.
- Check mounting location: Ensure the Heat HubR is not installed directly above a boiler flue, in a sealed cupboard, or next to other heat sources.
- Improve ventilation: Provide airflow around the Heat HubR by opening cupboard doors or relocating items that block vents.
- Allow to cool: Leave power off for 15–30 minutes to allow the unit to cool, then restore power and monitor.
If H05 recurs in a cool, well-ventilated location, the internal sensor or power components may be faulty. Replace the Heat HubR.
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Repair Difficulty
Hard
4/5
Required Part
Wiser Heat HubR main PCB
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