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3.3 Protection
◆ Compressor delay protection: the delay for the compressor to start/stop is three minute. The first time when it
is power on, it starts up in one minute.
◆ High pressure protection: After compressor starts running and the high pressure switch interrupts for 10
seconds, the unit stops, “03E” flashing on the screen, and alarm sounds.
◆ Low pressure protection: After compressor starts running for 3 minutes and the low pressure switch
interrupts for 10 seconds, the unit stops, “04E” flashing on the screen, and alarm sounds.
◆ Sensor fault: if the sensors fail, all parts stop working.
Part IV Trouble Shooting
Table 4.1
Fault
Code
Fault Possible Causes Treatment
03E High pressure switch
fault (protect when
interrupts)
◇High pressure switch destroyed
◇water tank lacks of water
◇The system is jammed, the probe
of sensor falls down
◇Excessive refrigerant
◇Some un-condensable gas in the
refrigerant system
◇Replace high pressure switch
◇Refill water
◇Check and clean the system, retighten
the probe
◇Drain out the superfluous refrigerant
◇Drain out the un-condensable gas
04E Low pressure switch
fault (protect when
interrupts)
◇Low pressure switch destroyed
◇Inadequate refrigerant
◇The fins of the evaporator are
dirty
◇Replace low pressure switch
◇Leak hunting and fill in standard
quantity of refrigerant
◇Clean the fins
05E Overheating of the
outlet water
◇Clogged water line
◇water outlet temperature sensor
fault
◇Check the water system and the pump
◇Check the electric resistance of the
sensor
09E Communication error
( the control panel
can’t receive
information from the
PCB)
◇Open circuit or short circuit
between the operation panel and
PCB
◇Renovate or Replace the wire between
control panel and PCB
11E Coil sensor fault
(open circuit or short
circuit)
◇The sensor open circuit
◇The probe of the sensor falls
down
◇the sensor short circuit
◇Reconnect the wirings of the sensor
◇Retighten the probe
◇Renovate wirings and remove faults
12E Environment sensor
fault (open circuit or
short circuit)
◇The sensor open circuit
◇The probe of the sensor falls
down
◇the sensor short circuit
◇Reconnect the wirings of the sensor
◇Retighten the probe
◇Renovate wirings and remove faults
15E Water-tank sensor
fault (open circuit or
short circuit)
◇The sensor open circuit
◇The probe of the sensor falls
down
◇the sensor short circuit
◇Reconnect the wirings of the sensor
◇Retighten the probe
◇Renovate wirings and remove faults
Note: when the fault arises, the correspondent fault code will be flashing on the screen and alarm sounds.
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