E9
Polaris
Main Control Board Communication or Internal Fault
E9 is displayed and the cooker does not respond to program selection or heating commands.
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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
Corrupted firmware on main control board, Internal short or component failure on PCB, Loose ribbon cable between display board and main board, Power supply section failure on control board
How to Fix / Troubleshooting
Safety first: Disconnect the cooker from mains power before opening any covers.
- Power cycle: Leave the cooker unplugged for 15–20 minutes to allow capacitors to discharge, then reconnect and test. If E9 returns immediately, proceed.
- Inspect internal connections: Remove the bottom cover and front panel as needed to access the main control board and display board. Check all ribbon cables and connectors for secure fit.
- Look for damage: Examine the PCB for burnt components, bulging capacitors, or signs of moisture damage. If present, the board must be replaced.
- Board replacement: Replace the main control board with an original Polaris spare part for your exact model. Transfer any detachable wiring harnesses one by one to avoid misconnection.
- Firmware issues: Some Polaris models allow firmware reprogramming only at authorized service centers. If the board appears intact but E9 persists, contact Polaris service for re-flashing or board replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (PCB)
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