Alarm conditions:
24B - Probe U3 broken or disconnected (Analog low pressure sensor (LPT1)).
25B - Probe U4 broken or disconnected (Suction temperature sensor (ST1)),
26B - Probe U5 broken or disconnected (Analog high pressure sensor (HPT1))
27B - Probe U6 broken or disconnected (Discharge temperature sensor (DT1))
28B - Probe U8 broken or disconnected (Phase sequence relay (circuit 2 or circuit 3))
29B - Low superheat alarm circuit 1 (Superheat < 4K, more than 360)
30B - LOP alarm in circuit 1 (Too low condensation pressure)
31B - MOP alarm in circuit 1 (Too high disscharge pressure)
32B - Low suction temperature in circuit 1 (Suction temperature < -20 °C for more than 180 s, or < -25 °C)
33B - High discharge pressure in circuit 1 (Measured by analog high pressure sensor (HPT1) > 33 bar, for more than 180s)
34B - Low suction pressure in circuit 1 (Measured by analog low pressure sensor (LPT1) <4 bar, for more than 180s, or <3,3 bar)
35B - Low pressure circ.1 by pressostat Pressostat LP1 42 bar (auto reset at 33 bar)
37B - Maintenance request compressor 1 circuit 1 Not used
38B - Pump down end for max time circuit 1 Not used
39B - Error BLDC management circuit 1 Compressor can not start because of electrical limitations (voltage, current, etc.). Can also appear of compressor type or settings missmatch.
40B - High discharge temp. circuit 1 >105°C for more than 180 s, or imediately if >115°C
41B - Alarm delta pressure circuit 1 Pressure difference is <0,5 bar after 15 s since compressor start. Possible refrigerant leackage, stuck SVR or EVD, broken compressor.
42B - Start failure BLDC circuit 1 Compressor can not reach specified speed during start-up. Can appear because of compressor type/settings mismatch.
43B - Envelope alarm circuit 1 Compressor was working outside envelope zone for longer than 180 s. Needed to verify in what zone compressor was running, to find possible reasons.
44B - Offline Power+ circuit 1 No communication with Carel frequency inverter. Possible reasons: no power, broken cable, wrong settings.
45B - Alarm Power+ circuit 1 Alarm generated by Carel frequency inverter. Actual alarm message needed to be checked in /_hp.html screen or on the Carel control panel.
46B - Probe S1 EVD circ.2 broken or disconnected Analog low pressure sensor (LPT2)
47B - Probe S2 EVD circ.2 broken or disconnected Suction temperature sensor (ST2)
48B - Probe S3 EVD circ.2 broken or disconnected Analog high pressure sensor (HPT2)
49B - Probe S4 EVD circ.2 broken or disconnected Discharge temperature sensor (DT2)
50B - Low SH alarm circ.2 SH<4K, more than 360 s
51B - LOP alarm circuit 2 Too low condensation pressure
52B - MOP alarm circuit 2 Too high disscharge pressure
53B - ExV motor alarm circuit 2
54B - Low suction temp. circuit 2 Suction temperature -20 °C for more than 180 s
55B - Battery alarm EVD circuit 2
56B - EEPROM EVD alarm circuit 2
57B - Firmware EVD circ.2 not ok
58B - Configuration error EVD circuit 2
59B - Offline EVD circ.2
60B - High discharge press. circuit 2 Measured by analog high pressure sensor (HPT2)
61B - Low suction pressure circuit 2 Measured by analog low pressure sensor (LPT2)
62B - Low pressure circ.2 by pressostat Pressostat LP2
63B - High pressure circ.2 by pressostat Pressostat HP2
64B - Maintenance request compressor 1 circuit 2 Not used
65B - Pump down end for max time circuit 2 Not used
66B - Compressor Starter overcurrent circuit 2
67B - Mains power phases mismatched Check voltage and phase sequence
68B - Compressor failure Alarm delta pressure circuit 2 Pressure difference is <0,5 bar after 15 s since compressor start. Possible refrigerant leackage, stuck SVR or EVD, broken compressor.
69B - Envelope alarm circuit 2 Compressor was working outside envelope zone for longer than 360 s. Needed to verify in what zone compressor was running, to find possible reasons.
70B - Probe S1 EVD circ.3 broken or disconnected Analog low pressure sensor (LPT3)
71B - Probe S2 EVD circ.3 broken or disconnected Suction temperature sensor (ST3)
72B - Probe S3 EVD circ.3 broken or disconnected Analog high pressure sensor (HPT3)
73B - Probe S4 EVD circ.3 broken or disconnected Discharge temperature sensor (DT3)
74B - Low SH alarm circ.3 SH<4K, more than 360 s
75B - LOP alarm circuit 3 Too low condensation pressure
76B - MOP alarm circuit 3 Too high disscharge pressure
77B - ExV motor alarm circuit 3
78B - Low suction temp. circuit 3 Suction temperature -20 °C for more than 180 s
79B - Battery alarm EVD circuit 3
80B - EEPROM EVD alarm circuit 3
81B - Firmware EVD circ.3 not ok
82B - Configuration error EVD circuit 3
83B - Offline EVD circ.3
84B - High discharge press. circuit 3 Measured by analog high pressure sensor (HPT2)
85B - Low suction pressure circuit 3 Measured by analog low pressure sensor (LPT2)
86B - Low pressure circ.3 by pressostat Pressostat LP2
87B - High pressure circ.3 by pressostat Pressostat HP2
88B - Maintenance request compressor 1 circuit 2 Not used
89B - Pump down end for max time circuit 3 Not used
90B - Compressor Starter overcurrent circuit 3
91B - High discharge temp. circuit 3
92B - Alarm delta pressure circuit 3 Pressure difference is <0,5 bar after 15 s since compressor start. Possible refrigerant leackage, stuck SVR or EVD, broken compressor.
93B - Envelope alarm circuit 3 Compressor was working outside envelope zone for longer than 360 s. Needed to verify in what zone compressor was running, to find possible reasons.
94B - Carel module configuration sequence was not completed
Solution:
Komfovent service is available by contact form or LiveChat.