Troubleshooting; Replacing A Fuse - Bosch Comfort Zone Manager 100 Instructions D'installation

16 | Troubleshooting

6 Troubleshooting
Use only original spare parts. Damage resulting from
spare parts not supplied by the manufacturer is not
covered under warranty.
If a fault cannot be corrected, contact the service
technician responsible for your area.
The status indicator indicates the operating status of the CZM100.
2
1
Fig. 18 Flashing status indicator
Some faults are also indicated on the display of the CRC100/CRC200
associated with the heating zone.
Status indicator Possible cause
Always off (on Code switch set to 0 ▶ Set the code switch.
the code switch)
Power supply
interrupted.
Faulty fuse
Short-circuit in the
BUS connection
Continuously red Internal fault
(on the code
switch)
Flashing red (on Code switch set to
the code switch) invalid position or in
an intermediate
position
Flashing green Maximum cable
(on the code length of BUS
switch) connection
exceeded
 Fault indicator on
the display of the
CRC100/CRC200
BUS user missing; no
set point received.
Temperature sensor
faulty.
Continuously No faults
green (on the
code switch)
Table 6 Troubleshooting
6 720 811 731 (2015/01)
4
3
S
Y
0
I
6 720 810 538-23.1O
Remedy
▶ Switch ON power.
▶ Replace fuse when the
power supply is switched
off ( Section 6.1).
▶ Check BUS connection
and repair if necessary.
▶ Replace module.
▶ Set the code switch.
▶ Shorten the BUS
connection.
▶ The corresponding
instructions for the
CRC100/CRC200 and
the service manual
contain additional
information for
troubleshooting.
▶ Check BUS connection
and repair if necessary.
▶ Replaced temperature
sensor.
Normal operation
6.1

Replacing a fuse

DANGER: Risk of electric shock!
▶ Electrically isolate the boiler and system
components. Secure against unintentional
reconnection and make sure the power supply is
disconnected.
To replace a fuse the cover of the module has to be removed. Each step
is displayed in  Fig. 19 / 20, page 17.
1. Release fuse.
2. Take defective fuse out of fuse socket.
3. Dispose of defective fuse.
4. Replace fuse into fuse socket.
5. Secure fuse.
6. Fit the cover.
CZM100