H75 - Low water temperature control

What does H75 mean?

This is a control status indicating that the room heater has been disabled and a de-ice request is active due to low water temperature. The system needs the heater to operate to increase water temperature.

• Heater operation is disabled
• Extremely low water temperature
• System settings preventing water heating

Click steps to track your progress.

1. 1

   Note the H75 status displayed on the control panel.

2. 2

   Check your system's settings to ensure that the heater operation is enabled for increasing water temperature.

3. 3

   If the issue persists and water temperature remains low, turn off the power supply at the circuit breaker for 5 minutes, then restore power.

4. 4

   If the problem continues, contact an authorized Panasonic service technician to diagnose the low water temperature control.