ANTIFREEZE PROTECTION
1. When the controller is on and the ambient temperature is too low
it will enter the antifreeze mode to prevent the circulation line or
the water tank from freezing.
2. When the ambient temperature is ≤ 2
°C
, the heat pump enters the
first anti-freeze protection. The circulating water pump continuous-
ly stops for more than 30 minutes, then starts for 60 seconds, and
repeats the cycle.
3. When the ambient temperature is ≤ 2
°C
, and the water tank
temperature is ≤ 5
°C
, heat pump enters the secondary anti-freeze
protection when the heat pump automatically turns on for heating.
When the ambient temperature ≥ 4
°C
or the tank temperature is
≥ 15
°C
, the heat pump stops heating and exits the secondary frost
protection.
LOW AMBIENT TEMPERATURE PROTECTION
1. When the ambient temperature is ≤ -9°C, the compressor will not
operate.
2. When the ambient temperature is ≥ -7°C normal operation is
resumed. This protection has no fault display.
WATER TEMPERATURE OVERCOOLS AT COOLING MODE
1. If the compressor is running for 5 minutes in the cooling mode
and the outlet water temperature is < 5°C for 5 consecutive
seconds, the heat pump enters sub cooling protection. The
compressor and the fan will stop running, and the water pump
will operate as normal.
2. When the outlet water temperature is detected to be ≥ 7 °C, the
heat pump exits the sub cooling protection and will operate as
normal.
WATER TEMPERATURE OVERHEAT PROTECTION AT HEATING
MODE
1. If the compressor is running for 5 minutes in the heating mode
and the water temperature is ≥ 65°C for 5 consecutive seconds,
it is judged that the outlet water temperature is too high. It will shut
down heat pump for protection.
2. When the outlet water temperature is deteced to be ≤ 60°C, the
heat pump exits the sub heating protection and will operate as
normal.
TEMPERATURE SENSOR FAILURE
1. The heat pump will stop if the water tank temperature sensor, outlet
water temperature sensor, or ambient temperature sensor is faulty.
2. The electric heater will continue to operate if the exhaust,
evaporator coil or water return temperature sensor is faulty.
3. When the return water temperature sensor fails, the return pump is
allowed to run (the return water temperature will not be accurate)
4. The electric heater will not operate if the water tank or ambient
temperature sensor are faulty.
5.. “11E”, “12E”, “13E” ", "14E", "15E", "17E", "18E", "19E". correspond
with the following faults: coil temperature sensor, ambient
temperature sensor, exhaust temperature sensor, inlet water
temperature sensor/tank temperature sensor, absorb temperature
sensor, and outlet water temperature sensor/return water
temperature sensor are faulty.
CONTROLLER INSTRUCTIONS
THE ALARM
LOW PRESSURE FAULT
1. If the compressor starts running for 5 minutes and the low-
pressure switch is off for 10 consecutive seconds the compressor
immediately stops running. At this time the controller will display
the low-pressure fault alarm code “04E”. If the low-pressure switch
is restored the error code does not occur. If no other protection or
locking occurs, the compressor will restart after 3 minutes.
2. If low-pressure fault protection appears 3 times within 1 hour, the
controller will lock the protection. The compressor will lock in the
shutdown protection state. At this time, only the shutdown and
restarting can unlock the compressor. The low-pressure switch is
not detected during the defrosting.
HIGH PRESSURE FAILURE
1. If the compressor starts running and the high-pressure switch is
off for for 10 consecutive seconds the compressor immediately
stops running. At this time the controller will display the high-
pressure fault alarm code “03E”. If the high-pressure switch is
restored, error code will not occur. If no other protection or
locking occurs, the compressor will restart after 3 minutes.
2. If high-pressure fault protection appears 3 times within 1 hour,
the controller will lock the protection, and the compressor will
be locked in the shutdown protection state. At this time only the
shutdown and restarting can unlock the compressor.
HIGH EXHAUST TEMPERATURE FAILURE
1. If the compressor starts running for 1 minute and the exhaust
gas temperature is detected to be higher than, or equal to the
exhaust high temperature protection value by 110
°C
for 10
consecutive seconds, a high exhaust temperature alarm will
sound and the compressor will stop. At this time, controller
shows high temperature fault alarm code "02E". When the
exhaust temperature drops back to 90
°C
, the alarm is released
and the normal temperature control function is restored.
2. If high temperature fault protection appears 3 times within half an
hour, the controller will lock the protection, and the compressor
will be locked in the shutdown protection state. At this time only
the shutdown and restarting can unlock the compressor.
WATER FLOW FAILURE
1. If the circulating water pump starts and the water flow switch is off
for 10 seconds then heat pump will stop. At this time, the controller
displays the water flow switch fault alarm code “01E”.
2. Periodically (1 minute) restarts the water pump and 10 seconds
later, the flow switch is detected. If water flow switch is closed,
heat pump will operate normally. If the fault occurs 3 times within
1 hour, the fault is locked and heat pump will not start.
