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long-term power failure; otherwise, the clock of the water heater will malfunction and the VACATION
function will not work properly.
4.7 Special Function
4.7.1 Keypad Lock
In normal status of the unit, press and hold ▲+▼ for 5s. The LOCK icon is displayed on the
controller and all buttons become unavailable. The LOCK icon blinks when any button is pressed. To
cancel the Keypad lock function, press and hold ▲+▼ for 5s again. Then the LOCK icon disappears.
If the unit is faulty, the lock function becomes invalid and all buttons are available again. The Keypad
lock function will resume after the error is rectified. In addition, the lock status before power failure is
memorized.
4.7.2 Temperature unit setting (℃/℉)
In the Off state of the wired controller, press and hold MODE+▲ on the main interface for 5s to enter
the query interface. Then the query code 00 is displayed, press and hold MODE+▲ for 5s to display the
configurable parameter codes and values. Press ▲ or ▼ to select P5 and press the MODE button. Then
item value 00 or 01 blinks under the parameter code P5. Press ▲ or ▼ to select the item value and
press the MODE button to confirm setting (00: ℃ and 01: ℉). After that, press the FUNCTION button
to return to the main interface. If no operation is performed with 15s, it will switch back to the main
interface automatically.
NOTE: Other parameters cannot be modified; otherwise, operation exception will be caused.
4.8 Errors Display
When some errors occur during operation, the error codes will be displayed on the controller.
Meanwhile, the unit is in the Off state and the controller supports only the on/off and query functions.
If multiple errors occur to the water heater simultaneously, the corresponding error codes will be
displayed circularly.
If the controller displays a error, shut down the water heater and contact qualified personnel for
maintenance. The following figure shows a communication error.
For details on error codes, see the table attached at the end of this manual.
AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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