170
COMMISSIONING
Error code
Title Cause of error Check point
14
Flows Switch/Flow
sensor error
• Flow rate <= Minimum flow
for at least 15 seconds
while water pump is in
operation.
Minimum flow rate (12, 14,
16 kW): 15 l/min
• Check the actual flow rate in the remote
controller (Monitoring screen)
• Make sure there is no water leakage /
low pressure
• Make sure the strainer or water pipe is
not clogged and valves are open.
• Make sure all air is released from
heating circuit (!)
• Check the condition of internal water
circulation pump
• Check installation of external pump (if
needed)
• Check the flow sensor itself
15
Water pipe
abnormal overheat
• Abnormal operation of
Backup heater
• Leaving water temperature
> 75°C
• External heat source not de-coupled
from heat pump
• Problem with Backup heater
16
AWHP
temperature
sensor at once
error
• More than one sensor
shows invalid data
• Sensors mixed up or multiple damages
17
PHEX inlet temp.
sensor Error
• Incorrect connection
between sensor and PCB
• PCB fault
• Sensor fault
• Resistance*: 5 kΩ at 25°C (unplugged)
• Voltage: 2.5 VDC at 25°C (plugged)
18
PHEX outlet temp.
sensor Error
19
Unit (Electric
heater) outlet
temp. sensor Error
20
Backup
heater/Thermal
fuse
• Abnormal overheat (>=
80°C) of internal Backup
heater
• Mechanical fault at thermal fuse
• Wire damaged
21
DC Peak (IPM
Fault)
• Instant over current
• Over Rated current
• Poor insulation of IPM
• An instant over-current in the U,V,W
phase
- Comp lock
- Abnormal connection of U,V,W
• Over load condition
- Overcharging of refrigerant
- Pipe length/diameter
- Outdoor fan locked
• Poor insulation of compressor
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