Wolf CWL-2-325 Installation And Operating Instructions Manual page 27

Fault
Fault Sub
code code
E121 E2200 externalBus general
E122 E2300 Internal ModBus fault;
E123 E2400 External ModBus fault;
E124 E2500 USB port general fault
E170 E2600 One or more CO
E171 E2700 External preheater or
E172 E2800 External postheater or
7100832_202010
Appliance
Cause
action
BM-2 and other
fault message accessories do
not work.
Appliance is
working
Appliance goes
general fault message to standby
Operation via
general fault message Modbus does not
work
USB interface
message not usable
Appliance is
2
working; no CO
sensor(en) defective;
general fault message regulation
No preheater /
fuse defective; general comfort control
fault message responds
differently
No postheater /
fuse defective; general comfort control
fault message responds
differently
User action
Check wiring to accessories/ BM-2
Check accessories/ Air Control and replace if defective
If there is still a fault after this: Take voltage from
appliance and replace basic pcb UWA2-B
Check wiring and connections to UWA2-B and the fans
Replace cable harness if damaged; Then exchange
UWA2B, exhaust fan and supply fan
Check cabling of accessories; replace if damaged
Check accessories; replace if defective
If fault still occurs: Take voltage from appliance and
replace UWA2-B basic pcb
Replace USB accessory
If the fault is not remedied after this: take the voltage from
the appliance and replace UWA2-B basic pcb
Check cabling and CO sensor(s); replace if damaged
2
Check CO sensor(s); replace if defective
2
2
Uncouple preheater and check preheater fuse; replace
fuse if defective
Has the fault not yet been remedied:
Replace external preheater
Put voltage back on appliance
Fault has automatically been reset
Uncouple postheater and check postheater fuse; replace
fuse if defective
Has the fault not yet been remedied:
Replace external postheater
Put voltage back on appliance
Fault has automatically been reset
xxxx
WOLF GmbH | 27