Benchmark ZWB 7-29 CC1 Installation And Servicing page 68

Failure identification procedure
AC
flashing.
Module not detected.
(Constant CH flow temperature according to CH temperature control on boiler.)
Check
1.
B Press button
B Select service function 1.9 .
Code 0., 2., 4., 5. is displayed.
2. Are 24 V DC cables routed along-
side 230 V AC cables?
3. Connecting lead between PCB con-
trol board and TA 211 E or TA 212 E
defective.
4. TA 211 E connected?
B Select service function 1.6 .
5.
Outside temperature between -20
and +30 ˚C is displayed.
Does temperature displayed
match true outside temperature?
6. If remote control installed:
B Select service function 1.7 .
Remote control status 0. is dis-
played .
20
yes:
.
no:
yes:
no:
yes:
no:
yes:
no:
yes:
no:
Action
B Note the setting of the temperature controls
and .
No modul detected.
B Disconnect connecting lead between PCB con-
trol board and TA 211 E or TA 212 E.
B Re-connect connecting lead.
AC? ↓3.
↓2.
B Ensure cable separation conforms to minimum
requirements as per installation instructions and/
or use shielded cable.
↓3.
B Power OFF the appliance.
B Replace connecting lead between PCB control
board and programmer interface module or TA
211 E.
B Turn ON the appliance.
AC? ↓4.
↓5.
↓8.
↓7.
B Power OFF the appliance.
B Replace outside temperature sensor.
B Turn ON the appliance.
AC? ↓7.
B Power OFF the appliance.
B Plug the connection wire.
B Turn ON the appliance.
AC? ↓7.
↓7.
7 181 465 346 GB (03.02)