| Code | Alarm text | Comment | Troubleshooting tips | ||
|---|---|---|---|---|---|
| Text | Hex | ||||
| 1B | 1 | Low supply airflow | Supply flow not reaching 80% of setpoint in normal mode or 95% of setpoint while calibrating VAV |
1. Too high pressure in the duct system (wrong size ducts, closed diffusers, blocked intake grills, stuck dampers) 2. Dirty filters 3. Disconnected, clogged, bent pressure tubes |
|
| 2B | 2 | Low extract air flow | Extract flow not reaching 80% of setpoint in normal mode or 95% of setpoint while calibrating VAV |
1. Too high pressure in the duct system (wrong size ducts, closed diffusers, blocked intake grills, stuck dampers) 2. Dirty filters 3. Disconnected, clogged, bent pressure tubes |
|
| 3B | 3 | VAV calibration fail | Both VAV sensors values are out of allowed range (3..9V) |
VAV sensor not connected, broken or wrong measuring range selected. |
|
| 4B | 4 | Change outdoor air filter | Outdoor air filter impurity level reached 100% |
Message can also appear after unsuccessful filter calibration |
|
| 5B | 5 | Change extract air filter | Extract air filter impurity level reached 100% |
Message can also appear after unsuccessful filter calibration |
|
| 6B | 6 | Electric heater off | Heater overheat (TK70) |
Thermostat 70°C |
|
| 7B | 7 | Electric heater off | Heater radiator overheat (TK60) |
On the units where TRIAC’s has separate overheating thermostat 60°C on the radiator |
|
| 8B | 8 | Electric heater off | Heater(Zone1) overheat (TK70) |
Additional zone with electrical heater. Thermostat 70°C |
|
| 9B | 9 | Electric heater off | Heater(Zone1) radiator overheat (TK60) |
On the units where TRIAC’s has separate overheating thermostat 60°C on the radiator |
|
| 10B | A | Electric heater off | Heater(Zone2) overheat (TK70) |
Additional zone with electrical heater. Thermostat 70°C |
|
| 11B | B | Electric heater off | Heater(Zone2) radiator overheat (TK60) |
Additional zone with electrical heater. Thermostat 70°C |
|
| 12B | C | High pressure on compressor |
Reached maximum allowed pressure (18 bar), by presostat (RHP Standard). Resets at 13 bar. |
||
| 13B | D | Low pressure on compressor |
Reached minimum allowed pressure (0,5 bar), by presostat (RHP Standard). Resets at 1,5 bar |
||
| 14B | E | Service time |
One year of continuous operation has passed |
||
| 15B | F | Evaporator icing | Heat pump evaporator icing and can’t be defrosted |
After three defrost cycles, pressure drop over evaporator have not increased above limit |
|
| 16B | 10 | Compressor failure | Compressor 1 |
DIN 17-18 on PM board |
|
| 17B | 11 | Compressor failure | Compressor 2 |
Not used |
|
| 18B | 12 | Compressor failure | Compressor 3 |
Not used |
|
| 19B | 13 | Compressor off | Heatpump can’t start due to too low air flow |
Minimum airflow needed for the heat pump to start not reached. Increase airflow setpoint |
|
| 20B | 14 | Compressor off | Heatpump can’t start due to too low air temperature |
Outdoor temperature is between max. temperature allowed for heating and min. temperature allowed for cooling (default is 15 and 20C) |
|
| 21B | 15 | ||||
| 22B | 16 | ||||
| 23B | 17 | ||||
| 24B | 18 | Compressor failure | Probe U3 broken or disconnected |
Analog low pressure sensor (LPT1) |
|
| 25B | 19 | Compressor failure | Probe U4 broken or disconnected |
Suction temperature sensor (ST1) |
|
| 26B | 1A | Compressor failure | Probe U5 broken or disconnected |
Analog high pressure sensor (HPT1) |
|
| 27B | 1B | Compressor failure | Probe U6 broken or disconnected |
Discharge temperature sensor (DT1) |
|
| 28B | 1C | Compressor failure | Probe U8 broken or disconnected |
Phase sequence relay (circuit 2 or circuit 3) |
|
| 29B | 1D | Compressor failure | Low SH alarm circ.1 |
SH<4K, more than 360 s |
|
| 30B | 1E | Compressor failure | LOP alarm circuit 1 |
Too low condensation pressure |
|
| 31B | 1F | Compressor failure | MOP alarm circuit 1 |
Too high disscharge pressure |
|
| 32B | 20 | Compressor failure | Low suction temp. circuit 1 |
Suction temperature < -20 °C for more than 180 s, or < -25 °C |
|
| 33B | 21 | Compressor failure | High discharge press. circuit 1 |
Measured by analog high pressure sensor (HPT1) >33 bar, for more than 180s |
|
| 34B | 22 | Compressor failure | Low suction pressure circuit 1 |
Measured by analog low pressure sensor (LPT1) <4 bar, for more than 180s, or <3,3 bar |
|
| 35B | 23 | Compressor failure | Low pressure circ.1 by pressostat |
Pressostat LP1 <1,7 bar (auto reset at 2,7 bar) |
|
| 36B | 24 | Compressor failure | High pressure circ.1 by pressostat |
Pressostat HP1 >42 bar (auto reset at 33 bar) |
|
| 37B | 25 | Maintenance request compressor 1 circuit 1 | |||
| 38B | 26 | Pump down end for max time circuit 1 | |||
| 39B | 27 | Compressor failure | 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 | 28 | Compressor failure | High discharge temp. circuit 1 |
>105°C for more than 180 s, or imediately if >115°C |
|
| 41B | 29 | Compressor failure | 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 | 2A | Compressor failure | Start failure BLDC circuit 1 |
Compressor can not reach specified speed during start-up. Can appear because of compressor type/settings mismatch. |
|
| 43B | 2B | Compressor failure | 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 | 2C | Compressor failure | Offline Power+ circuit 1 |
No communication with Carel frequency inverter. Possible reasons: no power, broken cable, wrong settings |
|
| 45B | 2D | Compressor failure | 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 | 2E | Compressor failure | Probe S1 EVD circ.2 broken or disconnected |
Analog low pressure sensor (LPT2) |
|
| 47B | 2F | Compressor failure | Probe S2 EVD circ.2 broken or disconnected |
Suction temperature sensor (ST2) |
|
| 48B | 30 | Compressor failure | Probe S3 EVD circ.2 broken or disconnected |
Analog high pressure sensor (HPT2) |
|
| 49B |
31 |
Compressor failure | Probe S4 EVD circ.2 broken or disconnected |
Discharge temperature sensor (DT2) |
|
| 50B | 32 | Compressor failure | Low SH alarm circ.2 |
SH<4K, more than 360 s |
|
| 51B | 33 | Compressor failure | LOP alarm circuit 2 |
Too low condensation pressure |
|
| 52B | 34 | Compressor failure | MOP alarm circuit 2 |
Too high disscharge pressure |
|
| 53B | 35 | Compressor failure | ExV motor alarm circuit 2 |
|
|
| 54B | 36 | Compressor failure | Low suction temp. circuit 2 |
Suction temperature -20 °C for more than 180 s |
|
| 55B | 37 | Compressor failure | Battery alarm EVD circuit 2 | ||
| 56B | 38 | Compressor failure | EEPROM EVD alarm circuit 2 |
|
|
| 57B | 39 | Compressor failure | Firmware EVD circ.2 not ok |
|
|
| 58B | 3A | Compressor failure | Configuration error EVD circuit 2 |
|
|
| 59B | 3B | Compressor failure | Offline EVD circ.2 |
|
|
| 60B | 3C | Compressor failure | High discharge press. circuit 2 |
Measured by analog high pressure sensor (HPT2) |
|
| 61B | 3D | Compressor failure | Low suction pressure circuit 2 |
Measured by analog low pressure sensor (LPT2) |
|
| 62B | 3E | Compressor failure | Low pressure circ.2 by pressostat |
Pressostat LP2 |
|
| 63B | 3F | Compressor failure | High pressure circ.2 by pressostat |
Pressostat HP2 |
|
| 64B | 40 | Maintenance request compressor 1 circuit 2 | Not used | ||
| 65B | 41 | Pump down end for max time circuit 2 | Not used | ||
| 66B | 42 | Compressor Starter overcurrent circuit 2 | |||
| 67B | 43 | Compressor failure | Mains power phases mismatched |
Check voltage and phase sequence |
|
| 68B | 44 | 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 | 45 | Compressor failure | 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 | 46 | Compressor failure | Probe S1 EVD circ.3 broken or disconnected |
Analog low pressure sensor (LPT3) |
|
| 71B | 47 | Compressor failure | Probe S2 EVD circ.3 broken or disconnected |
Suction temperature sensor (ST3) |
|
| 72B | 48 | Compressor failure | Probe S3 EVD circ.3 broken or disconnected |
Analog high pressure sensor (HPT3) |
|
| 73B | 49 | Compressor failure | Probe S4 EVD circ.3 broken or disconnected |
Discharge temperature sensor (DT3) |
|
| 74B | 4A | Compressor failure | Low SH alarm circ.3 |
SH<4K, more than 360 s |
|
| 75B | 4B | Compressor failure | LOP alarm circuit 3 |
Too low condensation pressure |
|
| 76B | 4C | Compressor failure | MOP alarm circuit 3 |
Too high disscharge pressure |
|
| 77B | 4D | Compressor failure | ExV motor alarm circuit 3 |
|
|
| 78B | 4E | Compressor failure | Low suction temp. circuit 3 |
Suction temperature -20 °C for more than 180 s |
|
| 79B | 4F | Compressor failure | Battery alarm EVD circuit 3 |
|
|
| 80B | 50 | Compressor failure | EEPROM EVD alarm circuit 3 |
|
|
| 81B | 51 | Compressor failure | Firmware EVD circ.3 not ok |
|
|
| 82B | 52 | Compressor failure | Configuration error EVD circuit 3 |
|
|
| 83B | 53 | Compressor failure | Offline EVD circ.3 |
|
|
| 84B | 54 | Compressor failure | High discharge press. circuit 3 |
Measured by analog high pressure sensor (HPT2) |
|
| 85B | 55 | Compressor failure | Low suction pressure circuit 3 |
Measured by analog low pressure sensor (LPT2) |
|
| 86B | 56 | Compressor failure | Low pressure circ.3 by pressostat |
Pressostat LP2 |
|
| 87B | 57 | Compressor failure | High pressure circ.3 by pressostat |
Pressostat HP2 |
|
| 88B | 58 | Compressor failure | Maintenance request compressor 1 circuit 2 |
Not used |
|
| 89B | 59 | Compressor failure | Pump down end for max time circuit 3 |
Not used |
|
| 90B | 5A | Compressor failure | Compressor Starter overcurrent circuit 3 |
|
|
| 91B | 5B | Compressor failure | High discharge temp. circuit 3 |
|
|
| 92B | 5C | Compressor failure | 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 | 5D | Compressor failure | 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 | 5E | Compressor failure | Carel module configuration sequence was not completed |
|
|
| 127B | 7F | Serviso režimas | I/O override or pressure lock function is active |
By deleting alarm all override inputs/outputs will be restored to automatic |
|
| 1A | 80 | Supply air temp. sensor failure | B1 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 2A | 81 | B1 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 3A | 82 | Extract air temp. sensor failure | B2 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 4A | 83 | B2 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 5A | 84 | Outdoor air temp. sensor failure | B3 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 6A | 85 | B3 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 7A | 86 | Exhaust air temp. sensor failure | B4 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 8A | 87 | B4 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 9A | 88 | Water temp. sensor failure | B5 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 10A | 89 | B5 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 11A | 8A | Return water temp. low | Bellow set alarm temperature (default +8C) |
Incorrect/damaged wiring, faulty sensor, faulty heating system/control |
|
| 12A | 8B | Internal fire alarm | Supply air temp. exceeding +70C or extract air temp. exceeding +50C |
Incorrect/damaged wiring, faulty sensor |
|
| 13A | 8C | External fire alarm | External fire system |
Signal received from external fire system to C5 connections 6-8 |
|
| 14A | 8D | External stop | External alarm input |
External signal received by controller |
|
| 15A | 8E | Heat exchanger failure | Heat exchanger efficiency is too low |
1. Rotary heat exchanger not rotating (broken belt, motor, control board) 2. CF heat exchanger by-pass failure (damper stuck, broken actuator, actuator not connected) 3. Air temperature sensors measuring incorrectly, so calculated efficiency is incorrect. 4. Air leakage between extract and supply airflows (missing gaskets, not fully closed door) |
|
| 16A | 8F | Heat exchanger icing |
|
1.After three cycles of defrosting, pressure drop over exchanger has not increased above critical limit 2.After three cycles of defrosting, exchanger efficiency has not increased above critical limit |
|
| 17A | 90 | Low supply air temperature | Supply air temp drops bellow +5C |
Incorrect/damaged wiring, faulty sensor, faulty heating system/control |
|
| 18A | 91 | High supply air temperature | Supply air temp. exceeding +45C (10min) |
Incorrect/damaged wiring, faulty sensor, faulty heating system/control |
|
| 19A | 92 | Low supply air flow | Supply flow not reaching 30% of setpoint |
1. Disconnected, clogged, bent pressure tubes. 2. Air dampers stuck or not open 3. Fan turning in wrong direction (AC fans) 4. Wrong fan settings (k-factor, VM module microswitches, wrong max. airflow setting) 5. Control voltage not reaching the fan (broken cable, electronic board) 6. Broken fan or frequency inverter |
|
| 20A | 93 | Low extract air flow | Extract flow not reaching 30% of setpoint |
1. Disconnected, clogged, bent pressure tubes. 2. Air dampers stuck or not open 3. Fan turning in wrong direction (AC fans) 4. Wrong fan settings (k-factor, VM module microswitches, wrong max. airflow setting) 5. Control voltage not reaching the fan (broken cable, electronic board) 6. Broken fan or frequency inverter |
|
| 21A | 94 | Electric heater overheat | Heater TK100 |
Reset electrical heating protection relay by pressing "RESET" button, check thermostat, wiring |
|
| 22A | 95 | Heater(Zone1) TK100 |
Reset electrical heating protection relay by pressing "RESET" button, check thermostat, wiring |
||
| 23A | 96 | Heater(Zone2) TK100 |
Reset electrical heating protection relay by pressing "RESET" button, check thermostat, wiring |
||
| 24A | 97 | Evaporator air temp. sensor failure |
B11 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 25A | 98 |
B11 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 26A | 99 | Evaporator coil temp. sensor failure |
B12 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 27A | 9A |
B12 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 28A | 9B | Compressor failure |
Compressor 1 |
|
|
| 29A | 9C |
Compressor 2 |
|
||
| 30A | 9D |
Compressor 3 |
|
||
| 31A | 9E | Supply air temp. sensor failure |
Open circuit (Zone1) |
Incorrect/damaged wiring, faulty sensor |
|
| 32A | 9F |
Short circuit (Zone1) |
Incorrect/damaged wiring, faulty sensor |
||
| 33A | A0 |
Open circuit (Zone2) |
Incorrect/damaged wiring, faulty sensor |
||
| 34A | A1 |
Short circuit (Zone2) |
Incorrect/damaged wiring, faulty sensor |
||
| 35A | A2 | Water temp. sensor failure |
Open circuit (Zone1) |
Incorrect/damaged wiring, faulty sensor |
|
| 36A | A3 |
Short circuit (Zone1) |
Incorrect/damaged wiring, faulty sensor |
||
| 37A | A4 |
Open circuit (Zone2) |
Incorrect/damaged wiring, faulty sensor |
||
| 38A | A5 |
Short circuit (Zone2) |
Incorrect/damaged wiring, faulty sensor |
||
| 39A | A6 | Return water temp. low |
Zone1 |
Incorrect/damaged wiring, faulty sensor, faulty heating system/control |
|
| 40A | A7 |
Zone2 |
Incorrect/damaged wiring, faulty sensor, faulty heating system/control |
||
| 41A | A8 | Supply air temp. sensor failure |
B14 Open circuit |
Incorrect/damaged wiring, faulty sensor |
|
| 42A | A9 |
B14 Short circuit |
Incorrect/damaged wiring, faulty sensor |
||
| 43A | AA | External stop |
Zone1 |
|
|
| 44A | AB |
Zone2 |
|
||
| 89A | D8 | Communication error | Carel module not responding to modbus requests |
No communication with Carel main board. Possible reasons: no power, broken cable, wrong settings |
|
| 90A | D9 | Service mode | C5 board is locked | Can be unlocked only by Komfovent service department connected to the AHU. | |
| 91A | DA | Controller failure | Too low 24V supply voltage | Main power supply voltage, main controller | |
| 92A | DB | Too high 24V supply voltage | Main power supply voltage, main controller | ||
| 93A | DC | Supply fan C5_VM module | Incorrect wiring, settings, faulty module | ||
| 94A | DD | Exhaust fan C5_VM module | Incorrect wiring, settings, faulty module | ||
| 95A | DE | El. Heater C5_PM module | Incorrect wiring, settings, faulty module | ||
| 96A | DF | Heat pump C5_PM module | Incorrect wiring, settings, faulty module | ||
| 97A | E0 | Zone1 C5_PM module | Incorrect wiring, settings, faulty module | ||
| 98A | E1 | Zone2 C5_PM module | Incorrect wiring, settings, faulty module | ||
| 99A | E2 | Supply fan drive failure | Alarm generated by fan frequency inverter | ||
| 100A | E3 | Supply fan drive overload | (Lenze: F_AF) | Alarm generated by fan frequency inverter | |
| 101A | E4 | Supply fan motor failure | (Lenze: F_rF, F_OF1) |
Alarm generated by fan frequency inverter |
|
| 102A | E5 | Supply fan motor overload | (Lenze: F_EF), Overheat | Alarm generated by fan frequency inverter | |
| 103A | E6 | (Lenze: F_PF, F_OF), Overcurrent | Alarm generated by fan frequency inverter | ||
| 104A | E7 | Exhaust fan drive failure | Alarm generated by fan frequency inverter | ||
| 105A | E8 | Exhaust fan drive oveload | (Lenze: F_AF) | Alarm generated by fan frequency inverter | |
| 106A | E9 | Exhaust fan motor failure | (Lenze: F_rF, F_OF1) |
Alarm generated by fan frequency inverter |
|
| 107A | EA | Exhaust fan motor overload | (Lenze: F_EF), Overheat | Alarm generated by fan frequency inverter | |
| 108A | EB | (Lenze: F_PF, F_OF), Overcurrent | Alarm generated by fan frequency inverter | ||
| 109A | EC | Rotor drive failure | Alarm generated by fan frequency inverter | ||
| 110A | ED | Rotor drive overload | Alarm generated by fan frequency inverter | ||
| 111A | EE | Rotor motor failure | Alarm generated by fan frequency inverter | ||
| 112A | EF | Rotor motor overload | Alarm generated by fan frequency inverter | ||
| 113A | F0 | Alarm generated by fan frequency inverter | |||
| 114A | F1 | Communication error | Supply fan C5_VM module | Cable, settings or electronics fault | |
| 115A | F2 | Exhaust fan C5_VM module | Cable, settings or electronics fault | ||
| 116A | F3 | El. Heater C5_PM module | Cable, settings or electronics fault | ||
| 117A | F4 | Heat pump C5_PM module | Cable, settings or electronics fault | ||
| 118A | F5 | Zone1 C5_PM module | Cable, settings or electronics fault | ||
| 119A | F6 | Zone2 C5_PM module | Cable, settings or electronics fault | ||
| 120A | F7 | Supply drive (Lenze modbus) | Cable, settings or electronics fault | ||
| 121A | F8 | Exhaust drive (Lenze modbus) | Cable, settings or electronics fault | ||
| 122A | F9 | Supply drive2 (Lenze modbus) | Cable, settings or electronics fault | ||
| 123A | FA | Exhaust drive2 (Lenze modbus) | Cable, settings or electronics fault | ||
| 124A | FB | Rotor drive | Cable, settings or electronics fault | ||
| 125A | FC | Controller failure | Internal pressure sensors (C5_DP) | ||
| 126A | FD | C5 Analog circuit (auto-calibration, multiplexer) | Short circuit on the C5 board external terminals (incorrect wiring, broken external components) | ||
| 127A | FE | C5 Digital circuit (EEPROM, flash) | |||