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 confirming 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.
E11 Error code
If the Haier indoor unit displays error code E11, then perform the following checks:
Check MENU > SETTINGS > INSTALLATION > 841226 > EQUIPMENT INSTALLATION confirming the below match:
- Zone 1 <ON>
- Zone 2 <OFF>
- Pool <OFF> (This causes the E11 error if ON)
- DHW <ON>
- Buffer Tank <OFF>
For further guidance consult the Haier installation guide.