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:

 

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