F4
Caple Power Relay / Triac Failure

Electric ceramic hob shows F4 and multiple zones are disabled.

Advertisements

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.

Advertisements

Possible Causes

Shorted triac on control board, Burnt power relay contacts, Overheated control PCB, Loose high‑current connections

How to Fix / Troubleshooting

Safety first: Disconnect from mains. High‑current circuits can cause severe shock or fire if mishandled.

Technician checks:

  • Access the main control PCB and inspect the power switching devices (triacs or relays) for burn marks or cracked cases.
  • Check solder joints on high‑current tracks and terminals for signs of overheating.
  • Test suspect triacs with a multimeter for shorts between MT1 and MT2; test relays for stuck contacts.
  • Verify that the supply wiring to the board is tight and not discoloured.

Remedy: Replace the faulty triac/relay or the entire control PCB. Ensure all spade terminals are firmly seated and that any heat sinks are correctly refitted.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements