5.21.2 Alarm codes
Error codes are divided in different groups for easier recognition of the alarm
source. Those groups are:
Error code
Error source
1000…1999
Hardware related errors
2000…2999
Application related errors
3000…3999
Communication errors
9000…9999
3rd party related errors
Code
Alarm
Class
Name/Description
Source
Plant
lock
BACnet object / Comment
Influence of alarm
Code range for - Hardware (AHU)
1001
A
Supply air temperature,
sensor fault
System
Stop
TSu
Shutdown AHU
1002
A/B
Exhaust air temperature,
sensor fault
System
Run
TEh,
active only if sensor available
Shutdown AHU / No heat
exchanger supervision possible
1003
B
Extract air temperature,
sensor fault
System
Run
TEx,
active only if sensor available
Fallback to room temperature
control or supply air control
1004
A/B
Outside air temperature,
sensor fault
System
Conf.
TOa
Shutdown AHU / fallback to default
1005
A
Frost protection temperature
for heating coil, sensor fault
System
Stop
TFrPrtHcl,
active only if HclHw selected
Shutdown AHU, Frost protection
mode
1006
B
Relative humidity for extract
air, sensor fault
System
Run
HuRelEx,
active only if sensor available
Stop Humidity control if all sensors
fail
1009
A
Fire damper, position
feedback fault
Proces
s
Stop
FdpFb,
active only if Fdp selected.
Plausibility check of fire damper
position feedback
Shutdown AHU
1012
B
Room temperature,
sensor fault
System
Run
TR with POS8/QMX3
Fallback to extract temperature
control or supply air control
1013
B
Room air quality,
sensor fault
System
Run
AQualR with QMX3 or PmR
Stop air quality control if all sensors
fail
1014
B
Extract air quality,
sensor fault
System
Run
PmR or AQualR, Particulate
matters, Air quality
Stop control if all sensors fail
1015
B
Cooling coil DX evaporator
fault
Proces
s
Run
CclDxFlt (BI, active only if CclDx
selected
Switch off cooling device
1017
B
Room air humidity,
sensor fault
System
Run
HuRelR,
if configured on QMX
Stop Humidity control if all sensors
fail
1018
A/B
Supply air temp. after
preheating coil, sensor fault
System
Run
TSuAfPreHcl,
active only if sensor available
Shutdown AHU / Shutdown electric
preheating coil, fallback value for
heat exchanger efficiency
1019
B
Flow temperature preheating
coil, sensor fault
System
Run
TFlPreHcl,
active only if sensor available
Fallback to default value
1020
B
Air filter, dirty
Proces
s
Run
Operating hours of air filter
exceeds limit or delta P,
active only if FilA selected
No reaction
1021
B
Supply air temperature after
heat exchanger, sensor fault
System
Run
TsuAfHExg,
active only if sensor available
Fallback value for Hexg efficiency
calculation
1031
A/B/n
Heat Exchanger fault
Proces
s
Run
RotHExgFlt or HExgCdnMon (BI)
Shutdown AHU / Bypass or
shutdown HExg / no reaction
1032
B
Supply air pressure,
sensor fault
System
Run
PSu,
active only if VntCtl12 selected
Fallback to extract air control, linear
fan speed if all sensors fail
Application functionalities
Alarm functions
5
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