AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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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 Cleaning (available to circular models only)
In the Off state of a normal unit, press and hold MODE for 5s. The unit starts the cleaning
function and HOTWATER, SAVE, PRESET, and NIGHT icons are displayed on the LCD. To cancel the
cleaning function, press and hold for 5s again.
The cleaning process lasts for 30 minutes at the most and it will stop automatically 30 minutes after
the cleaning function is started. When the cleaning function is started, the ON and OFF buttons become
unavailable.
If the unit is faulty, the cleaning function is canceled automatically.
This function is used for cleaning circular air source water heaters and for exhausting air in the
water system during debugging.
4.7.3 Manual/Automatic switchover for the water return pump
In the Off state of the wired controller, press and hold MO on the main interface for 5s to
enter the query interface. Then the query code 00 is displayed, press and hold for 5s to
display the configurable parameter codes and values. Press to select P0 and press the MODE
button. Then item value 00 blinks under the parameter code P0. Press to select the item value
and press the MODE button to confirm setting (00 indicates manual control and 01 indicates automatic
control). 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.
4.7.4 Temperature unit setting ( / )
In the Off state of the wired controller, press and hold on the main interface for 5s to
enter the query interface. Then the query code 00 is displayed, press and hold for 5s to
display the configurable parameter codes and values. Press to select P5 and press the MODE
button. Then item value 00 or 01 blinks under the parameter code P5. Press 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.
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