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Haier troubleshooting

Heat pump communication

If the Haier is not successfully communicating with the Passiv Smart Thermostat then check the following:

  • Confirm the RS485 cable connections within the indoor unit are the correct way around. If necessary double check continuity back to the previous device
  • Confirm the screening drain wire is interconnected and earthed at a single point e.g. Programmer earth
  • Ensure a single twisted pair (e.g. white core + black core) is used for A (white core) & B (black core). Do NOT double up cores or use cores from different twisted pairs for A & B connections.

Heat pump operation

If the Haier heat pump fails to respond to changes on the Programmer or thermostats, such as a higher target temperature. Please check the Haier indoor unit for a failure code, often in new installations air may be present around the circulation pump, which may prevent the heat pump from starting. 

Check MENU > SETTINGS > INSTALLATION > 841226 > SYSTEM INSTALLATION please check that the below match. 

  • Control mode Zone 1 <main controller>
  • Control mode DHW <main controller>

Setting this to any other setting will prevent the Passiv Smart Thermostat from controlling the heating.

For further guidance consult the Haier installation guide.