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3062878_201707
14. Fault messages
Alarm messages
Effects
Cause
Remedy
External fault (AL64)
Depending on
parameter
System OFF
message only
External assembly faulty Check external assembly;
acknowledge fault message
Smoke detector responded
(AL65)
Subject to parameter
settings, either
system OFF, only
message or smoke
extraction
Smoke detector has
responded
Acknowledge fault message
KGWO burner fault (AL66)
System shuts down
Burner faulty
Check burner and acknowledge
fault
Fault (AL74)
Heat pump
During heating mode
= system OFF
During cooling mode
= HP switches off
Fault
Heat pump
Check heat pump, acknowledge
fault message
Pump fault
Reheater bank (AL75)
Pump off, heating
valve closed, heat
source demand off
A motor overload relay
of an external heating
circuit pump has
responded
Reset motor overload relay;
check power drawn by the pump;
acknowledge fault
Frost thermostat
Reheater bank responded
(AL76)
System off, reheater
bank pump on,
reheater bank valve
open, heat source
demand on
Temperature captured
at the thermostat below
limit
Check heating medium;
check heating circuit pump;
check frost thermostat;
acknowledge fault
Cooling control databus
fault (AL77)
Cooling control shuts
down
Connection between
air handling control unit
and cooling control unit
is faulty
Check the connection; switch on
cooling control
RCS control databus fault
(AL78)
RCS control shuts
down
Connection between
air handling control unit
and RCS control unit is
faulty
Check the connection; switch on
RCS control
Coil loop control unit
switched off (standby)
(AL79)
Depending on
parameter setting
System Off, message
only
Coil loop control unit
switched off via control
module.
Switch on coil loop control unit
via control module.
BMS outside temperature
implausible (AL 80)
Message only;
special functions
(night ventilation etc.)
disabled
Value outside the valid
entry range or no value
change for more than
24 hours
Check the BMS connection,
addressing & logic; acknowledge
fault message
Notice: Alarm messages AL67 - AL73 are alarms for adiabatic cooling and are described in the enclosed assembly/
service instructions WRS-K "Adiabatic Cooling".