Alarm Codes - Danfoss BW10 020-090 Operation Instructions Manual

6.4 - Alarm codes

Alarm Alarm Alarm description
No. code
Thermistor faults
1 th-01 Fluid sensor fault, evaporator water
outlet
2 th-02 Fluid sensor fault, evaporator water
inlet
3 th-06 Fluid sensor fault, condenser water
outlet
4 th-07 Fluid sensor fault, condenser water
inlet
5 th-10 Outside temperature sensor fault
6 th-11 HTWSTEMP fluid sensor fault
(master/slave)
7 th-12 Suction sensor fault, circuit A
8 th-13 Suction sensor fault, circuit B
9 th-32 CHWSTEMP fluid sensor fault
(master/slave)
10 th-36 Fluid sensor fault DRY_LWT
11 th-44 Sensor fault, discharge circuit A
12 th-45 Sensor fault, discharge circuit B
Pressure transducer faults
13 Pr-01 Discharge pressure transducer fault,
circuit A
14 Pr-02 Discharge pressure transducer fault,
circuit B
15 Pr-04 Suction pressure transducer fault,
circuit A
16 Pr-05 Suction pressure transducer fault,
circuit B
17 Pr-24 Entering evaporator water pressure
sensor fault
18 Pr-25 Leaving evaporator water pressure
sensor fault
19 Pr-26 Entering condenser water pressure
sensor fault
20 Pr-27 Leaving condenser water pressure
sensor fault
Communication with the slave boards
21 CO-BB Communication loss with the NRCP2
board
22 Co-e1 Communication loss with the EXV
board
23 Co-o1 Communication loss with the
PD-AUX 1 board
24 Co-o2 Communication loss with the
PD-AUX 2 board
25 Co-o3 Communication loss with the
PD-AUX 3 board
26 Co-o4 Communication loss with the
PD-AUX 4 board
Process faults
27 P-01 Water heat exchanger frost
protection
28 P-05 Low suction temperature, circuit A
29 P-06 Low suction temperature, circuit B
30 P-08 High superheat, circuit A
31 P-09 High superheat, circuit B
32 P-11 Low superheat, circuit A
33 P-12 Low superheat, circuit B
34 P-14 Water flow control and customer
interlock fault
35 P-15 Condenser water flow control fault
36 P-16 Compressor A1 not started or no
pressure increase registered
37 P-17 Compressor A2 not started or no
pressure increase registered
38 P-18 Compressor A3 not started or no
pressure increase registered
39 P-20 Compressor B1 not started or no
pressure increase registered
40 P-21 Compressor B2 not started or no
pressure increase registered
41 P-29 Communication loss with the System
Manager
Reset type
Automatic when the temperature measured
by the sensor returns to normal
As above
Automatic when the temperature measured
by the sensor returns to normal
As above
As above
As above
As above
As above
As above
As above
As above
As above
Automatic when the voltage transmitted by
the sensor returns to normal
As above
As above
As above
Automatic when the voltage transmitted by
the sensor returns to normal
Automatic when the voltage transmitted by
the sensor returns to normal
As above
As above
Automatic when communication is
re-established
As above
As above
As above
As above
As above
Automatic if the same alarm has not tripped
during the last 24 hours, otherwise manual.
Automatic when the temperature returns to
normal, and if this alarm has not appeared
during the last 24 hours, otherwise manual.
As above
As above
As above
As above
As above
Automatic if the unit is in manual shut-down
status, otherwise manual.
Automatic if the unit is in manual shut-down
status, otherwise manual.
Manual
As above
As above
As above
As above
Automatic when communication is
re-established
Probable cause
Defective thermistor
As above
Defective thermistor
As above
As above
As above
As above
As above
As above
As above
As above
As above
Defective transducer or installation
fault
As above
As above
As above
Defective transducer or installation
fault
Defective transducer or installation
fault
As above
As above
Installation bus fault or defective
slave board
As above
As above
As above
As above
As above
Water flow rate too low or defective
thermistor
Pressure sensor defective, EXV
blocked or low refrigerant charge
As above
As above
As above
As above
As above
Heat exchanger pump defect or
water flow switch fault
Heat exchanger pump defect or
water flow switch fault
Connection problem
As above
As above
As above
As above
CCN installation bus defective
Action taken by the control
Unit is shut down
As above
Unit is shut down
As above
Unit is shut down
The master/slave mode is
stopped
Circuit is shut down
As above
The master/slave mode is
stopped
Unit is shut down
Circuit is shut down
Circuit is shut down
Circuit is shut down
As above
As above
As above
Circuit is shut down
Circuit is shut down
As above
As above
Depending on the configuration,
compressor A3 is shut down or
circuit B is shut down.
Unit is shut down
Unit with optional water pressure
sensors, unit is shut down
Unit with optional water pressure
sensors, unit is shut down
Unit with drycooler, unit is shut
down
Unit with optional electric heater
stages
Unit is shut down
Circuit is shut down
As above
As above
As above
As above
As above
Unit is shut down
Unit is shut down
Compressor is shut down
As above
As above
As above
As above
Unit goes into autonomous mode
21