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Display Malfunction Description Corrective Action
E0 Error of sensor T5U (upper water temperature sensor)
The connection between sensor and PCB is broken or the
sensor has experienced an issue.
Contact a qualified person to service the unit.
E1 Error of sensor T5L (lower water temperature sensor)
The connection between sensor and PCB is broken or the
sensor has experienced an issue.
Contact a qualified person to service the unit.
E2 Tank and wired controller communication error
The connection between controller and PCB is broken or the
PCB has experienced an issue.
Contact a qualified person to service the unit.
E4 Evaporator temperature sensor T3 error
The connection between sensor and PCB is broken or the
sensor has experienced an issue.
Contact a qualified person to service the unit.
E5 Ambient temperature sensor T4 error
The connection between sensor and PCB is broken or the
sensor has experienced an issue.
Contact a qualified person to service the unit.
E6 Compressor discharge temperature sensor TP error
The connection between sensor and PCB is broken or the
sensor has experienced an issue.
Contact a qualified person to service the unit.
E8
Electric leakage error. If PCB current_induction_circuit
check the current difference between L,N >14mA, system
consider it as “electric leakage error”
The connection between some wires have broken or there is
a wiring connection issue.
Contact a qualified person to service the unit.
E9 Compressor suction temperature sensor TH error
The connection between sensor and PCB is broken or the
sensor has experienced an issue.
Contact a qualified person to service the unit.
EE
E-heater open-circuit error
(IEH (Current difference E-heater on & E-heater off ) < 1A)
The E-heater has been broken or there is a wiring connection
issue. Contact a qualified person to service the unit.
EF Clock chip error
The chip has been broken. However the unit can continue to
operate without clock-memory, but the clock will need to be
reset every-time power to the unit is restarted. If necessary,
contact a qualified person to service the unit.
Ed E-EPROM chip error Contact a qualified person to service the unit.
P1
System high pressure protection
≥ 3.0MPa active ；≤ 2.4MPa inactive
Either the system is blocked, there is excessive air, water or
refrigerant in system, of the water temperature sensor has
malfunctioned. Contact a qualified person to service the unit.
P2
High discharge temperature protection
Tp>115°C, Protection active
Tp<90°C, Protection inactive
System is potentially blocked, air or water or low refrigerant
(leakage) in system or water temp sensor malfunction.
Contact a qualified person to service the unit.
P3
Compressor abnormally stopped. The discharge temp is
less than the evaporator temp after compressor has been
running for a period
Compressor is broken or there is a wiring connection issue
between the PCB and compressor.
Contact a qualified person to service the unit.
P4
Compressor overloaded protection (10 seconds after
compressor start up), Current checking starts,
1. Only when compressor is running, if it is >7A , the
compressor will stop for protection.
2. Compressor + e-heater open, if it is >IEH+7,the
compressor will stop for protection.
Compressor is broken, system blocked, air or water or too
much refrigerant in system or water temperature sensor
malfunction.
Contact a qualified person to service the unit.
LA
When the ambient temp T4 is out of Heat Pump running
range (-7 ~ 43°) Heat Pump will stop, unit will show LA on
the position of clock on display until T4 back to (-7 ~ 43°)
It is normal, and repair is not necessary.
NOTE: The diagnostic codes above are the most common. If any other diagnostic code is displayed, contact for technical assistance.
7.2 Error Codes
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