Maintenance Of The Unit - Gree GRS-CQ4.0Pd/NhG3-E Owner's Manual

Air-to-water Heat Pump
(6) Conduct water input for the water tank according to water input operation.
(7) Water tank cleaning completed and energize it.
19.5.3 Mg-stick peplacement
(1) To improve durability of the water tank, a Mg-Stick is installed inside the water tank. Generally, the Mg-Stick
has a lifespan of two to three years. However, if the quality of water used by the water heater is poor, the
Mg-Stick lifespan will be shortened. For Mg-Stick replacement, perform the following steps:
(2) Before removing the Mg-Stick, drain the water tank by following drainage operations.
(3) Open the cap on the mounting mouth for the Mg-Stick in the water tank.
(4) Use a hex key to unscrew the Mg-Stick component, and then steadily removed the magnesium to prevent it
from falling into the inner container of the water tank.
(5) Install a new Mg-Stick component into the mounting mouth of the Mg-Stick, and then tighten it using a hex
key.
(6) Close the cap, and replenish water by following water replenishment operations.
Note: the Mg-Stick must be replaced by professional maintenance personnel. Please directly contact your local
dealer or authorized service center for survice support.

19.6 Maintenance of the unit

19.6.1 Error code list
(1) Complete unit code
Code Indication
F4
d6
Error Name
Outdoor environment temp
sensor error
Defrost temp sensor error
Source of Error Signal
The plug on temperature
①
sensor is not correctly
connected to the socket
on mainboard.
The resistance of
②
temperature sensor
is not correct.
The plug on temperature
①
sensor is not correctly
connected to the socket
on mainboard.
The resistance of
②
temperature sensor
is not correct.
54
MONOBLOC TYPE
Control Description
It will be automatically
cleared after the failure is
removed.
It will be automatically
cleared after the failure is
removed.