Fault Output; Troubleshooting - Bosch MU 100 Notice D'installation

Menu item
Max. differential
Maximum range
Max diff control
Proportional range
Ramp
Heat source control (setpoint value)
Config mode 0-10V
Input value f. off
Input value f. max.
Max. temp. set v.
Min. temp. set v.
Table 9 Menu MU 100 (for CW 400/RC310 from NF74.xx)
4.4

Fault output

The fault output (OE1-75 and OP0 in coding positions 3-5) is
only activated 10 minutes after the fault has occurred. If no
faults are present, the fault output is deleted immediately.
Faults, which disappear again within the delay time of 10
minutes, are not displayed on the fault output.
5

Troubleshooting

Use only original spare parts. Damage caused by the use of
spare parts not supplied by the manufacturer is excluded from
the warranty.
▶ If a fault cannot be rectified, please contact your local
service engineer.
If the coding switch is turned to 0 when the power supply is
switched on for >2 s, all the module outputs are reset to the
factory settings, the faults are deleted and all settings are reset
to the factory settings.
▶ Restart the module.
The On/Off indicator indicates the operating condition of the
module.
MU 100 – 6721804146 (2019/10)
Settings/adjustment range
25 ... 40 ... 85 K
1 ... 10 ... 20 K
1 ... 5 ... 20 K
off | 1 ... 5 ... 20 %/s
Temp. | Output
0 ... 10 V
0 ... 10 V
0 ... 90 ... 100 °C
0 ... 20 ... 100 °C
4 5 6
7
3
2 8
1 9
10
0
Status Possible causes
indicator
Constantl Invalid switch position or
y red internal fault
Red Temperature sensor faulty
flashing or pump alarm output
Constantl Coding switch set to 0
y yellow
Green No communication with the
flashing BUS system
Constantl No fault, normal operation
y green
Constantl Lack of electrical supply
y OFF
Table 10
0 010 013 313-001
Remark/restriction
Set maximum temperature differential
Enter width of max. range
Enter width of proportional range
Enter ramp for pump modulation
Boiler control via temperature or output?
Switch off boiler with voltage
Boiler at max. output with voltage
Set max. set temperature
Set min. set temperature
Remedy
▶ Replace the
module or select
valid switch
position.
▶ Replace
temperature
sensor or
eliminate pump
fault.
▶ Select the
correct encoding
position.
▶ Establish the
BUS connection
to the EMS-BUS
or check it.
▶ –
▶ Supply the
module with
mains voltage.
25