21
8.2 Other faults and solutions (with no display on the controller with LED)
Fault
Display
Cause
Solution
The heat pump
is not working
The LED display shows
nothing.
No power supply
Check the connection
of the cable and the circuit
breaker.
The LED display shows
the current time.
The heat pump is in the standby
mode.
Start up the heat pump.
The LED display
shows the actual water
temperature.
1. The water temperature
reaches the set value; the
heat pump is in the constant
temperature mode.
2. The heat pump has just
started up.
3. Defrosting is in progress.
1. Check the setting of the water
temperature.
2. Start up the heat pump
after several minutes.
3. The LED display should
show “defrosting”.
There is a drop in water
temperature when the
pump is running in the
heating mode.
The LED display shows
the water temperature, but
no error code.
1. Incorrect mode is selected.
2. The values indicate a fault.
3. Controller failure
1. Correct the running mode.
2. Replace the defective cable
controller with the LED
display, then check the
condition after the change
of the running mode,
and check the inlet and outlet
water temperature.
3. Replace the defective main
controller.
Short run
The LED display shows
the water temperature, but
no error code.
1. The fan is not running
2. Insufficient air ventilation
3. Lack of coolant
1. Check the cable connections
between the motor
and the fan, and replace them,
if necessary.
2. Check the location of the heat
pump unit and remove any
obstruction preventing from
good air ventilation.
3. Replace or repair the heat
pump unit.
Water pollution
Water pollution on the
heat pump unit
1. Water leakage
1. Carefully check the titanium
heat exchanger for damage.
Too much ice on the
evaporator
Too much ice on the
evaporator
1. Insufficient air ventilation
2. Lack of coolant
1. Check the location of the heat
pump unit and remove any
obstruction preventing good
air ventilation.
2. Replace or repair the heat
pump unit.
EN
