Gree GWH18PD-K3NNA1A Service Manual page 42

Troubleshooting
Display Method of Indoor Unit
Malfunction
No.
Error
Name
Code
Indoor
ambient
temperature
1 F1
sensor is
open/short
circuited
Indoor
evaporator
temperature
2 F2
sensor is
open/short-
circuited
PG motor
(indoor fan
3 H6
motor) does
not operate
alfunction
4 protectionof C5
jumper cap
Overcurrent
5 protection E5
Indicator lamp (During
blinking, ON for 0.5S and
OFF for 0.5 S)
Operation COOL HEAT
Lamp Lamp Lamp
OFF
3S and
blinks
once
OFF
3Sand
blinks
twice
OFF 3S
and blinks
11 times
OFF 3S
and blinks
15 times
OFF 3S
and blinks
5 times
A/C Status
The unit will stop operation
as it reaches the temperature
point. During cooling and
drying operation, except
indoor fan operates, other
loads (such as compressor,
outdoor fan, 4-way valve) stop
operation; During heating
operation, the complete unit
stops operation.
The unit will stop operation
as it reaches the temperature
point. During cooling and
drying operation, except
indoor fan operates, other
loads stop operation; During
heating operation, the
complete unit stops operation.
Indoor fan, outdoor fan,
compressor and electric heat
tube stop operation. 2minutes
later, 4-way valve stops;
horizontal louver stops at the
current position.
Operation of remote controller
or control panel is available,
but the unit won't act.
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
Possible Causes
1. The wiring terminal between indoor
ambient temperature sensor and controller is
loosenedor poorly contacted;
2. There's short circuit due to trip-over of the
parts on controller;
3.Indoor ambient temperature sensor is
damaged (Please check it by referring tothe
resistance table for temperature sensor)
4. Main board is broken.
1. The wiring terminal between indoor
evaporator temperature sensor and controller
is loosenedor poorly contacted;
2. There's short circuit due to the trip-over of
the parts on controller;
3.Indoor evaporator temperature sensor
isdamaged (Please check it by referring to the
resistance table for temperature sensor)
4. Main board is broken.
1. The feedback terminal of PG motor is
notconnected tightly.
2. The control terminalof PG motor is not
connected tightly.
3. Fan blade rotates unsmoothly due to
improper installation.
4. Motor is notinstalled properly and tightly.
5. Motor is damaged.
6. Controller is damaged.
1. There's not jumper cap on the controller.
2. Jumper cap is notinserted properly and
tightly.
3. Jumper cap is damaged.
4. Controller is damaged.
1. Unstable supply voltage. Normal fl uctuation
shall be within 10% of the rated voltage on the
nameplate.
2. Supply voltage is too low and load is too
high.
3. Measure the current of live wire on main
board. If the current isn't higher than the
overcurrent protection value, please check the
controller.
4. The indoor and outdoor heat exchangers
are too dirty, or the air inlet and air outlet are
blocked.
5. The fan motor is not running. Abnormal fan
speed: fan speed is too low or the fan doesn't
run
6. The compressor is not running normally.
There is abnormal sound, oil leakage or the
temperature of the shell is too high, etc.
7. There's blockage in the system (filth
blockage, ice plug, greasy blockage, Y-valve
hasn't been opened completely)
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