P-97 — Reversed entering/leaving water sensors

What does P-97 mean?

The water sensors for entering and leaving the heat exchanger appear to be reversed or one may be defective. The unit will be stopped.

• Sensors are installed in the wrong ports.
• One or both sensors are defective.
• Wiring issue with sensors.

Click steps to track your progress.

1. 1

   Verify that the entering and leaving water sensors are connected to the correct ports.

2. 2

   Check the wiring of both sensors for any damage or loose connections.

3. 3

   If sensors are suspected defective, replace them.

4. 4

   Reset the alarm after correction.