E14
SMEG
Relay or Triac Drive Fault on Control PCB
Microwave displays E14; interior light and fan may operate but cooking cannot be started.
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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
Stuck or burned power relay, Faulty triac controlling transformer/inverter, Damaged PCB tracks, Control logic failure
How to Fix / Troubleshooting
Safety: Unplug the microwave. Internal live parts remain dangerous even when the unit is off.
User-level steps:
- Perform a full power reset by unplugging for 10 minutes, then plug back in and test.
- Listen for the click of the main power relay when starting a cooking cycle. Absence of a click may indicate a relay issue.
Technician-level repair:
- Inspect the control PCB for burned or cracked solder joints around relays and triacs.
- Test the main power relay and replace if contacts are welded or open.
- Verify that the control microcontroller is sending the correct drive signals.
Because this involves live mains and HV control, PCB-level repair or replacement should be done by a professional.
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Repair Difficulty
Professional Required
5/5
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