Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
10 Troubleshooting
83311002 1/2018-03 La
95-132
The following faults must only be rectified by qualified personnel:
Warning codes Cause
Rectification
W35
DHW outlet sensor (B12) defective
Check the sensor and cable and replace if ne-
cessary
W36
System pressure too low
(see parameter
39
)
Check system pressure and top up
W42
No control signal from circulation pump
Check the connection
Check circulation pump
W43
Fan speed at stage 2 operation not achieved
Check burner setting
Check the fan and cable and replace if
necessary [ch. 9.16]
Rectify electromagnetic disturbance source
(sensor cable)
W61
Coded plug BCC not plugged in
Plug in coded plug
Transferring data from coded plug to boiler
electronics WCM-OB-CPU:
switch off appliance using switch S1.
Press and hold keys [Enter] and [reset] sim-
ultaneously and switch on appliance
The display shows
bcc
Confirm with [Enter]
W80
Communication to the cascade manager or
WCM-Sol is faulty
Check the connection
Check the cascade manager
Check address of parameter
12
Check eBus feed
W81
Communication to WCM-FS#1 is faulty
Check the connection
Replace remote control station
W82
Communication to EM#2 or WCM-FS#2 is
faulty
Check address
Check the connection
Replace the extension module
Replace remote control station
W83
Communication to EM#3 or WCM-FS#3 is
faulty
Check address
Check the connection
Replace the extension module
Replace remote control station
W84
Communication to EM#4 or WCM-FS#4 is
faulty
Check address
Check the connection
Replace the extension module
Replace remote control station
W85
Communication to EM#5 or WCM-FS#5 is
faulty
Check address
Check the connection
Replace the extension module
Replace remote control station
W86
Communication to EM#6 or WCM-FS#6 is
faulty
Check address
Check the connection
Replace the extension module
Replace remote control station
W87
Communication to EM#7 or WCM-FS#7 is
faulty
Check address
Check the connection
Replace the extension module
Replace remote control station