E12
CMA Dishmachines Control Board Communication Fault

Control communication or internal error; display shows E12 and machine may be unresponsive or locked.

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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

Loose control board connectors, Faulty display/keypad module, Internal control board failure, Electrical noise or power quality issues

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker before accessing the control compartment.

Step-by-step checks:

  • Power cycle: Leave the machine powered off for at least 2 minutes, then restore power to see if the error clears.
  • Inspect control wiring: Open the control panel and check all harness connectors between the main control board and display/keypad. Reseat each connector firmly.
  • Check for moisture or corrosion: Look for signs of water intrusion, steam damage, or corrosion on the control board and connectors. Address any gasket or panel sealing issues.
  • Verify supply voltage: Have a qualified person confirm that line voltage to the machine is within CMA’s specified range and that there are no frequent power drops or surges.

When to call a technician: Persistent E12 errors usually indicate a failing control board or display module, which should be replaced by a CMA-authorized technician.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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