1100 Series Nano Pump Service Manual 37
Troubleshooting and Test Functions 2
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The top foam has been removed.
The sensor on the CSM board detects when the top foam is in place. If the foam
is removed, the fan is switched off, and the error message is generated.
Probable Causes
• The top foam was removed during operation.
• Foam not activating the sensor.
• Sensor defective.
• Rear of the module is exposed to strong direct sunlight.
Suggested Actions
✔ Replace the top foam.
✔ Exchange the CSM board.
✔ Ensure that the rear of the module is not exposed to strong sunlight.
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