Error 41 (4 Green, 1 Red Flash) — Heat pump capacity signal error (Open or short)

What does 41 mean?

The hydraulic unit's green LED flashes four times and the red LED flashes once. This means there is an issue with the signal that controls or measures the heat pump's heating/cooling capacity, potentially due to an open circuit or a short circuit.

• Damaged or loose wiring for the capacity signal.
• A fault within the heat pump's control system.
• Sensor malfunction related to capacity regulation.

Click steps to track your progress.

1. 1

   Power cycle the heat pump system by turning it off at the main breaker for 60 seconds, then restoring power.

2. 2

   Inspect visible wiring connections to the outdoor unit and ensure they are secure.

3. 3

   Check the heat pump's control panel or app for any other diagnostic messages or settings that might indicate a capacity limit.

4. 4

   If comfortable and able, visually inspect accessible internal wiring for any signs of damage or loose connections (power off the unit completely first).

5. 5

   If the error persists, contact a certified technician to diagnose the capacity signal circuit and sensors.