E12
Prochem
Overcurrent / Circuit Overload Protection
Display shows E12 and machine shuts down shortly after start, often when both heater and vacuum are on.
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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
Running on undersized circuit breaker, Internal short in heater or motor, Simultaneous high-load operation exceeding design, Faulty current sensor on control PCB
How to Fix / Troubleshooting
Safety: Do not repeatedly reset breakers without finding the cause. Risk of fire.
- Verify circuit rating: Check that the Prochem unit is connected to a circuit with the correct amperage as specified on the rating plate. Avoid sharing the circuit with other heavy loads.
- Test components individually: Run the machine with heater OFF and only vacuum ON. Then test with heater ON and vacuum OFF (if possible). If E12 only occurs with a specific component, inspect that component for shorts or excessive current draw.
- Inspect heater and motors: Look for burn marks, melted insulation, or tripped thermal protectors on the heater, solution pump, and vacuum motors. Replace any component that shows signs of overheating or electrical damage.
- Check internal wiring: Inspect for pinched or rubbed-through wires touching the chassis. Repair and secure with cable ties.
- Control PCB current sensor: If measured current is within spec but E12 persists, the current-sensing circuit on the control PCB may be faulty. Replace the control PCB.
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Repair Difficulty
Hard
4/5
Required Part
Prochem Solution Heater Assembly
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