User manual

4 T r ouble shooting
4.1 Alarm Messages
In the event of an alarm message, try to r e-star t the unit with the safety switch.
If this does not work, try to solve the pr oblem with the help of the table below . Call your installation contractor if
you need help. See ”Refer ences” on page 30.
T able 3: Alarm Messages
28
Error code Explanation Cause How to do
RETURN TEMP Return water temperature
sensor
error;
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25
°C , the resistance of sensor should be 5K
FEEDLINE TEMP Supply water temperature
sensor error;
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25
°C , the resistance of sensor should be 5K
PIPE TEMP Defrost temperature
sensor (on evaporator)
error
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25 °C , the resistance of sensor should be 5K
OUTDOOR TEMP Outside air temperature
sensor error
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25 °C , the resistance of sensor should be 5K
ROOM TEMP Room air temperature
sensor error;
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25
°C , the resistance of sensor should be 5K
CMP TEMP Compressor exhaust
temperature sensor error;
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25 °C , the resistance of sensor should be 50K
WARM WATER TEMP Water tank temperature
sensor error
Sensor disconnected; Sensor was
defective.
Check the connections, the wire of sensor, or change the sensor.
Under 25 °C , the resistance of sensor should be 5K
HIGH PRESS (single
compressor system)
COMP.A PRESS(double
compressor system)
Compressor high
pressure protection
The wire disconnected; lack of
refrigerant;
water flow stop in the room cycle
Check
the wire connection; check refrigerant quantity; Check the
water cycled pump for the room heating system; Check if the
water system contains air
LOW PRESS (single
compressor system)
COMP.B PRESS(double
compressor system)
Compressor low
pressure protection
The wire disconnected; lack of
refrigerant;
Check the wire connection; check refrigerant quantity;
CMP OVER Compressor overload The actual current over the
contactor ‘s allowed current.
Compressor current too large;
Check the wire connection;
Check if the water system contains air, and cause the water
temperature over high and current over large
ADD HEAT OVER OR FLOW
TROUBLE
Supplementary
electrical heater over
heat or water flow got
problem
The temperature of electrical heater
over the max allowed temperature.
Water flow too small or stopped.
Check the wire connection;
Check if the water system contains air or without water
CMP AIR OVER Compressor exhaust air
temperature over heat
Water flow too small;
Lack of refrigerant
Check if the water system contains air or without water
Check the refrigerant quantity
WARMWATER TEMP TOO LOW
Temperature of the water
tank is too low.
Water tank temperature less than
10
ć
A . During heat pump running, whatever mode heat pump runs,
heat pump will give an alarm with sound, at the time, heat pump will
automatically turn to water tank heating, and
then go back to previous running mode until water tank’s
temperature get to 20
ć
B . During heat pump is not running, heat pump will give an alarm
with sound: WARM WATER. TOO LOW
POWER SUPPLY Phase error
For three-phase, the phase or der
r eversed or wrongly connected. For
single-phase, the “ three-phase
option Port ” in the circuit board is not
connected or loose.
Please check if the phase connections were correct.