F10
Protherm Low Voltage / Power Supply Fault

F10 error, appliance does not start, may appear after power disturbances

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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

Supply voltage below specification, Loose mains connections, Internal power supply failure on PCB, Incorrect neutral/earth connection

How to Fix / Troubleshooting

Safety first: Turn off the main breaker before inspecting electrical connections. Only qualified persons should work on mains wiring.

  • Measure supply voltage: Use a multimeter to check voltage at the appliance terminals. It must match the rating on the Protherm data plate.
  • Inspect terminal block: Check that live, neutral, and earth are correctly connected and firmly tightened. Look for signs of overheating or discoloration.
  • Check polarity and earth: Ensure correct polarity and a solid earth connection. Incorrect wiring can cause control board errors.
  • Surge protection: If F10 occurs after storms or grid issues, consider installing a surge protector and inspect the PCB for damage. Replace the main PCB if the internal power supply is faulty.

Warning: Never work on live circuits. If you are not trained, contact an electrician or authorized Protherm service.

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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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