Er4
Z Grills
Control Board Temperature Sensing Circuit Fault
Display shows Er4 and grill temperature reading is erratic or stuck.
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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
Failed temperature input circuit on control board, Corroded RTD connector damaging board pins, Internal control board component failure
How to Fix / Troubleshooting
Safety first: Disconnect power before removing the control panel or touching wiring.
Steps to address:
- Reset the controller: Unplug the grill for at least 5 minutes to discharge the control board. Plug back in and see if Er4 clears.
- Inspect RTD and connector: Remove the control panel and inspect the RTD connector and board pins for corrosion, burning, or bent pins. Clean gently with contact cleaner and a soft brush.
- Check for moisture: Look for signs of water intrusion in the control box. Dry any moisture thoroughly and improve sealing if necessary.
- Substitute RTD (if available): If you have a known-good RTD probe, temporarily connect it to the board outside the grill. If Er4 persists, the control board is likely faulty.
- Replace control board: Label and disconnect all connectors from the existing board. Remove mounting screws and install a new Z Grills control board. Reconnect all harnesses firmly, matching each to its labeled position.
- Test operation: Restore power and verify that the display shows a reasonable ambient temperature and that Er4 does not reappear during a heat cycle.
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Repair Difficulty
Hard
4/5
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