81-00 — Leaving water temperature sensor problem

What does 81-00 mean?

This error code points to a problem with the sensor measuring the temperature of the water leaving the unit.

• Damaged leaving water temperature sensor
• Wiring disconnection
• Incorrect sensor reading

Click steps to track your progress.

1. 1

   Check the connections of the leaving water temperature sensor.

2. 2

   Ensure the sensor is correctly installed and reading ambient temperature accurately when idle.

3. 3

   Try a system reset.

4. 4

   Call a technician if the sensor appears faulty.