The Mitsubishi R01SF9350 (Part #735327) is a genuine OEM main controller circuit board designed primarily for Mitsubishi Electric Ecodan and heat pump HVAC systems.

Key Details & Compatibility

• Primary Function: Acts as the central processing hub for outdoor heat pump units. It regulates compressor speeds, manages refrigerant flow, monitors sensor feedback (temperatures/pressures), and controls communication with indoor units or controllers.

• Known Model Compatibility: PUHZ-HW140VHA (including -HA2, HA-BS, HA2-BS, and R1-BS variants).

Common Diagnostic Symptoms

If this board experiences a failure, you will typically observe:

• Error codes displayed on the indoor unit controller (e.g., communication or main board operation faults).

• The outdoor unit failing to trigger the compressor or fan despite receiving a heat/cool call from the thermostat.

• Blown line-voltage fuses on the board itself or repeated breaker trips.

Next Steps & Recommendations

1. Verify Part Match: Inspect the sticker on your original circuit board to confirm both the board layout and the exact part numbers (R01SF9350 / 735327) match.

2. Professional Service: Because this board connects directly to high-voltage lines and delicate inverter components, installation should ideally be handled by a certified HVAC technician.