Haier Arctic Multi Series Service Bulletin

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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.

Models affected:

Arctic Multi

2U20EH2VHA

3U24EH2VHA

FlexFit Multi 3U24MS2VHB

4U36MS2VHB

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.

Service Bulletin

JUNE 2019

DFS05-19

SW1

DFS05-19

Page 1 JUNE 2019 DFS05-19 Service Bulletin 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.
Page 2 JUNE 2019 DFS05-19 Service Bulletin Testing Process: All indoor fans will come on at HIGH fan speed. EEV for Circuit A will open. All other EEV’s will close. After a 3 minute delay, the Compressor will start and ramp up to 55HZ. The digital display will alternately display “CH”...
Page 3 JUNE 2019 DFS05-19 Service Bulletin Testing Process (continued): Once all indoor units have been checked, the digital display will show either “EC” or “0” • “EC” indicates there is an error in the wires to the indoor unit(s). • The LED(s) will be flashing, indicating which circuit(s) has the fault. •...