Haier FlexFit Multi 3U24MS2VHB

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DFS05-19

Multi-Split Communication Wiring Check

The FlexFit Multi and Arctic multi systems are capable of performing a self-test to check

communication wiring between the outdoor to the indoor units. This is a crucial step when performing

start-up on a system as well as performing checks during a service call. It allows you to confirm that

the wiring matches with the associated refrigerant lines for a given circuit.

Arctic Multi 2U20EH2VHA

3U24EH2VHA

FlexFit Multi 3U24MS2VHB

4U36MS2VHB

Models affected:

Instructions:

1. Disconnect power to the outdoor unit.

2. Set Dip Switches SW1-1, SW1-2, SW1-3 &

SW1-4 to the ON position. These dip

switches are located on the Service Monitor

Board. (pictured right).

3. Turn ON power to the outdoor unit.

JUNE 2019

Service Bulletin

SW1

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Summary

Multi-Split Communication Wiring Check

Wiring Check Setup Instructions

Instructions to prepare the unit for the communication wiring check, including dip switch settings.

Communication Wiring Test Procedure

Steps and expected system responses during the communication wiring self-test, including display codes.

Summary

Multi-Split Communication Wiring Check

Wiring Check Setup Instructions

Instructions to prepare the unit for the communication wiring check, including dip switch settings.

Communication Wiring Test Procedure

Steps and expected system responses during the communication wiring self-test, including display codes.