Error 86 (8 Green, 6 Red Flashes) — Pressure sensor error / Pressure switch error

What does 86 mean?

The hydraulic unit's green LED flashes eight times and the red LED flashes six times. This indicates an error with either a pressure sensor or a pressure switch in the system.

• Faulty pressure sensor or pressure switch.
• Loose or damaged wiring to the sensor/switch.
• Abnormal refrigerant pressure (too high or too low) triggering the switch.
• Low refrigerant charge or system blockage.

Click steps to track your progress.

1. 1

   Restart the heat pump system by turning off the main power for at least one minute, then switching it back on.

2. 2

   Check the outdoor unit for any signs of refrigerant leaks (frost, oil residue).

3. 3

   Ensure adequate airflow around the outdoor unit and clean any obstructions.

4. 4

   If the error persists, contact a qualified technician, as pressure-related issues often require specialized tools and refrigerant handling.