E4
Tower
Overvoltage / Undervoltage or Internal Power Supply Fault
Display shows E4 and the unit beeps and refuses to start or stops mid-cycle.
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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
Mains voltage outside specified range, Faulty internal SMPS power supply on control PCB, Loose mains connector or damaged power cord, Surge-damaged control PCB
How to Fix / Troubleshooting
Safety first: Disconnect the Tower air fryer from the mains before any inspection. Do not attempt live voltage measurements unless you are trained and equipped.
- Check the outlet: Plug another appliance (like a kettle) into the same socket to confirm stable power. Avoid using extension leads or multi-way adapters; plug the air fryer directly into a wall socket.
- Inspect the power cord: With the unit unplugged, check the cord for cuts, kinks, or burn marks. If damaged, the cord or entire unit should be replaced.
- Reset the unit: Leave the air fryer unplugged for 10–15 minutes to allow internal capacitors to discharge. Plug back in and test. If E4 clears, it may have been a transient surge.
- Internal inspection (advanced): Remove the housing to access the control PCB. Look for burnt components, bulging capacitors, or darkened areas near the power input section. Any visible damage indicates the PCB should be replaced, not repaired at home.
- Professional service: If E4 persists with a known-good outlet and intact cord, the internal power supply on the control PCB is likely faulty. Contact a qualified appliance technician or Tower support for board replacement.
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Repair Difficulty
Hard
4/5
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