E12
Siemens
Mode Control / Relay Fault on Main PCB
E12 error; refrigerator may not enter or exit SuperCool/SuperFreeze modes correctly; temperatures drift.
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
Stuck compressor relay, Faulty relay for SuperCool/SuperFreeze, PCB track damage, Overheated relay contacts
How to Fix / Troubleshooting
Safety first: Unplug the refrigerator before accessing the main control board.
Procedure:
- 1. Reset modes: Turn off SuperCool/SuperFreeze functions via the control panel, unplug for 10 minutes, then reconnect and test. If E12 returns, continue.
- 2. Access main PCB: Remove the rear control cover near the compressor. Identify the relays on the board (small rectangular components).
- 3. Visual inspection: Look for heat discoloration around relay solder joints or cracked solder. Burn marks indicate relay or board damage.
- 4. Functional test: Advanced users can test relay operation by measuring voltage at compressor or heater outputs when modes are activated (only if comfortable working with live voltage). Otherwise, rely on visual diagnosis and symptoms.
- 5. Replace PCB: If a relay is suspected faulty, Siemens typically recommends replacing the entire control board rather than individual relays.
Warning: Live-voltage testing should only be done by trained personnel with appropriate tools and precautions.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (PCB)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements