Midea RSJ-35/300RDN3-D - 5. Malfunctions and Resolutions; 6. Malfunction Code and Troubleshooting

MCAC-RTSM-2011-12 Midea Combo Type Heat Pump Water Heater Technical Manual
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5 Malfunctions and Resolutions
Malfunction
Cause
Resolutions
Outlet water is
cold.
The display
is dark.
Bad connection of power supply plug and
socket;
Outlet water is set an a low temperature;
Outlet water temperature controller is
damaged;
Circuit board of indicating indicator is
damaged;
Reconnect the plug;
Set outlet water at a higher temperature;
Contact the technician.
No hot water
from the outlet.
Tap water has been cut away;
Water pressure is too low;
Inlet valve has been closed.
It’ll return to normal after water supplied;
Use it when the pressure is higher;
Open the inlet water valve.
Water leakage
The joints on the pipeline are not
sealed well.
Check and reseal all
the joints.
If the unit occurs any malfunction or error, please shut down the system, turn off the power supply, and
consult your service persons for help.
6 Malfunction Code and Troubleshooting
6.1 Malfunction Code and description
Display
Malfunction Description
Display
Malfunction Description
E0
Error of sensor T5U
P1
System high pressure protection
≥2.76MPa active；
≤2.07Mpa inactive
E1
Error of sensor T5L
P2
High discharge temp. protection
Tp>115℃，Protection active
Tp<90℃，Protection inactive
E2
Tank and Wired Controller communication
error
P3
Compressor abnormally stopped protection
The discharge temperature is not so higher than
evaporator temperature after compressor running a
term.
E4
(T3) Condenser output pipe temperature
sensor error
P4
Compressor overloaded protection (10 sec after
compressor startup, Current checking starts ,
1)only compressor running, if it is >7A , the
compressor will be stopped and protected.)
2)Compressor+ e-heater opened, if it is >IEH+7,the
compressor will be stopped and protected.)
E5
(T4) Outdoor ambient temperature sensor
error
LA
When the ambient temp is out of Heat Pump running
zone [-7～43℃],Heat Pump will stop ,then LA
protection code will appear, and ALARM indicator
flashes if the condition maintain more than 20
hours, Need to switch to Enhanced heating Mode.
E6
(Tp) Comp. discharge Sensor error
E9
Compressor suction temperature sensor TH error
E7
Heat Pump system error
If any of P3/P4/P2/P1 continuously appear 3
times within single heating cycle, system will
consider it as “Heat Pump system error”
Ed
EEPROM chip error
EE
E-heater open-circuit error( IEH(Current difference
E-heater on & e-heater off )<1A)
E8
Electric leakage error
If PCB current induction circuit check the
current difference between L,N >14mA,
system consider it as” electric leakage error”
EF
Clock chip error