Gree GRS-CP11Pd/NhA-D - Control System Details; Main Control Board Description and Pinouts

Heat Pump Pool Heater
26
Silk-Screen Introduction
N Power input zero line
L Power input fire wire
E Filter ground wire
OFAN DC fan interface
FA Electronic expansion valve interface
HPP High-pressure switch interface
T-SEN Ambient temperature, discharge and pipe temperature sensor
T-SEN1 Suction temperature sensor
POWER Main control board power interface
COM UART communication interface
COMP Compressor interface
4WAY Four-way valve interface
6.4 Main Control Fault Information
Error Code Error Name Possible Causes Solution
E1 High-pressure protection
Insufficient water flow;
Poor contact caused by loose
pressure switch wire;
Abnormal pressure switch;
Main board fault;
Abnormal heat exchange of
water-side heat exchanger;
Over-high ambient temperature.
After the fault
is repaired,
power on
again to
recover.
E3 Low-pressure protection
Poor contact caused by loose
pressure switch wire;
Abnormal pressure switch.
E4 Discharge protection
Abnormal resistance value of the
exhaust temperature sensor;
Unit refrigerant leakage or
insufficient refrigerant.
E6 Communication fault
Loose or damaged
communication line wiring;
Display board fault;
Main board fault.
Automatic
recovery after
fault repair.
F3
Ambient temperature sensor
fault
Damaged temperature sensor;
Main board fault.
F4
Discharge temperature
sensor fault
F6
Outdoor heat exchanger tube
temperature sensor fault
Fd
Suction temperature sensor
fault
F8
Water inlet temperature
sensor fault
F9
Water outlet temperature
sensor fault