Installation and operating instruction
Hydraulic unit WWP LS 8 ... 16-B
10 Troubleshooting
83306902 2/2017-05 La
79-88
10.2 Fault codes
Outdoor unit
The following faults must only be rectified by qualified personnel:
Warning
Cause
Rectification
1
Heat exchanger sensor OU inlet (OCT) defective
Check the sensor and cable and replace if ne-
cessary
2
Compressed gas temperature sensor (CTT) defect-
ive
Check the sensor and cable and replace if ne-
cessary
3
Temperature sensor in inverter (HST) defective
Check the sensor and cable and replace if ne-
cessary
4
Air intake sensor (OAT) defective
Check the sensor and cable and replace if ne-
cessary
5
Heat exchanger sensor OU centre (OMT) defective
Check the sensor and cable and replace if ne-
cessary
8
Pressure downstream of compressor too high
Normally no action is required. Troubleshooting
is only required, if the problem occurs several
times within one hour.
Check the refrigerant level.
Check actuator of expansion vessel, replace if
necessary
Check service valves
9
Pressure upstream of heat exchanger in outdoor unit
too low
Normally no action is required. Troubleshooting
is only required, if the problem occurs several
times within one hour.
Check the refrigerant level.
Check soundness of cooling circuit
Check actuator of expansion vessel, replace if
necessary
10
No communication with the inverter
Check voltage supply to the inverter
Check connection cable
11
Compressor overcurrent
Check intake air area
Check fan
13
Cooling circuit leaking
Check cooling circuit
14
DC over or under-voltage
Check voltage supply
15
AC over or under-voltage
Check voltage supply
16
Outdoor unit and hydraulic unit not compatible
Check type
17
Communication error
Check BUS line
18
Outdoor unit overloaded
–
19
Fault on frequency converter of outdoor unit
Check voltage supply
20
Evaporator (heat exchanger) overheats
Check intake air area
Check fan
21
Defrost activated
Normally no action is required. Troubleshooting
is only required, if the problem occurs several
times within one hour.
Check cooling circuit
22
Compressor overheats
Normally no action is required. Troubleshooting
is only required, if the problem occurs several
times within one hour.
Check cooling circuit