Hitachi split air conditioner error codes

Problem

Reversal / Missing Phase

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check 3-phase power supply connections and sequence.

Problem

Outdoor Unit Overcurrent

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check compressor winding and power supply.

Problem

High Pressure Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check condenser, gas pressure, and outdoor fan.

Problem

Low Pressure Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check gas level and expansion valve.

Problem

Outdoor Fan Motor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check fan motor winding and capacitor.

Problem

Phase Protection (3 Phase)

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Verify 3-phase power supply sequence.

Problem

Compressor Overload

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check compressor, capacitor, and voltage.

Problem

Suction Temp High

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check gas charge and indoor fan operation.

Problem

Indoor Room Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check room temp sensor and wiring.

Problem

Indoor Pipe Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check pipe sensor resistance and connection.

Problem

Indoor Discharge Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check discharge sensor on indoor unit.

Problem

Indoor/Outdoor Communication Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check communication cable and printed circuit board connections.

Problem

Outdoor printed circuit board Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Replace outdoor main printed circuit board.