Err
MasterPro Generic System Error / Undefined Fault

Display shows a generic 'Err' message and beeps; no specific code number is shown.

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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

Transient control glitch, Loose internal connector, Firmware error, Multiple simultaneous sensor faults

How to Fix / Troubleshooting

Safety first: Unplug the cooker before any internal inspection.

Basic recovery:

  • Unplug the unit for at least 10 minutes, then reconnect and try a simple program like 'Keep Warm' or 'Rice'.
  • If 'Err' appears only on a specific mode, note which mode for service diagnostics.

Internal checks:

  • Remove covers and reseat all connectors: lid harness, pressure sensor, temperature sensors, heater, and keypad.
  • Inspect the main control board for obvious damage.

Resolution: If 'Err' persists after reseating connectors and power cycling, the main control board is likely at fault and should be replaced by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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