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A: Troubleshooting steps:
1. Loose wiring of the low water level switch. Check the low water level switch wiring – one end should be connected to the main control board port J26‑DI6, and the other end to the terminal block 24V.
2. Obstruction near the water level switch causing false alarm. Clear the obstruction.
3. Faulty low water level switch. Replace the low water level switch.
4. Clogged or faulty water inlet valve of the wet film humidifier. Clean or replace the wet film humidifier water inlet valve.
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