42 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
Pressure Signal Missing
The pressure signal from the damper is missing.
The pressure signal from the damper must be within a specific voltage range.
If the pressure signal is missing, the processor detects a voltage of
approximately -120mV across the damper connector.
Probable Causes
• Damper disconnected.
• Defective damper.
Suggested Actions
✔ Ensure the damper is connected correctly to the CSM board.
✔ Exchange the damper.
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