MCAC-RTSM-2013-12
Midea High-temperature Direct-heating Heat Pump Water Heater Technical Manual
44
6.
Error Code Cause Analysis and the Solutions
Code
Code explanation
Cause analysis
Solution
E1
Power phase
sequence failure
Reverse-connection of the unit three-phase
supply line
Exchange the two supply lines after
power off.
One phase or two phases are not connected
well
Connect the supply line well after
power off.
E2
Communication
failure
Communication failure between the main unit
and the wire controller.
Correct connection between the main
unit and the A, B, P, Q and E lines of
the wire controller.
Communication failure between the main unit
and the wire controller, slave unit failure
P, Q and E lines correct connection
between the slave unit and the main
unit, no connection of the A and B lines.
Electromagnetic interference because
communication line is not the shielded line
Replace the communication line with
the shielded line.
E3
Outlet water
temperature sensor
failure
The water port between the sensor and the
main board is loose
Insert the port well.
Sensor damage
Replace the sensor.
E4
Water temperature
sensor in the water
tank failure (the unit
can also be start up,
but only for the
directly-heating type)
The T5 port between the sensor and the main
board is loose
Insert the port well.
Sensor damage
Replace the sensor.
E5
Condenser
temperature sensor
failure
The T3 port between the sensor and the main
board is loose
Insert the port well.
Sensor damage
Replace the sensor.
E6
Outdoor ambient
temperature sensor
failure
The T4 port between the sensor and the main
board is loose
Insert the port well.
Sensor damage
Replace the sensor.
E7
Electric-heating pipe
temperature sensor
failure
( RSJ-380/SN1-820-
D)
The T6 port between the sensor and the main
board is loose
Insert the port well.
Sensor damage
Replace the sensor.
Ec
Water inlet temp.
sensor error(T7
temp.)
The T7 port between the sensor and the main
board is loose
Insert the port well.
Sensor damage
Replace the sensor.
Eb
Exhaust temp.
sensor error(TP
temp.)
The Tp port between the sensor and the main
board is loose
Insert the port well.
Sensor damage
Replace the sensor.
P0
System low pressure
protection
Outdoor fan is not open
Check the motor of the fan.
The evaporator is dirty
Clean the evaporator
Leakage of refrigerant
Check the leaking place, mend by
welding, drawing out the air and add
refrigerant again.
P1
System high
pressure protection
Circulating
mode
Deficient circulating water
pump flow use
RSJ-380/SN1-820-D
flow should be ≥
6 m
3
/h;
RSJ-200/SN1-540V-D flow should be
≥ 4 m
3
/h;
RSJ-100/N1-540V-D
flow should be ≥
2 m
3
/h.
Circulation pipeline filter is dirty
and blocked
Clean the filter.
The water pump doesn
’t work
Check the water pump
Warm water valve fault
Check the operation of the warm water
valve.
Bad bypass solenoid valve
operation and lack of water
flow PTE
Check the bypass solenoid valve.
Warm water valve
Check the operation of the warm water
valve.
