Bosch ME 200, Installation Instructions For Contractors

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Troubleshooting
ME 200 – 6720884576 (2019/08)
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4.5 Diagnosis menu
Which menus, information or values are available depend on which
system has been installed. Observe the technical documentation for the
heat source, control unit, additional modules and other system
components.
Function test
If a ME 200 module is installed, the menu Function test > AHS type is
displayed.
The function of the devices connected to the module can be tested in this
menu. The pump in the return of the alternative heat source can be
selectively switched on/off, for example.
Monitored values
If a ME 200 module is installed, the menu Monitored values > AHS type
is displayed.
You can call up information on the current status of the devices
connected to the module in this menu. You can display the flow and
return temperature of the alternative heat source here, for example.
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.
The status indicator at the coding switch shows the operating condition
of the module. Additional status indicators are:
[1] Alternative heat source
[2] Bypass valve/heating circuit pump
[3] Buffer cylinder
[4] Block of conventional heat source
These status indicators only become valid after the configuration wizard
has been exited and the setting of all other menu items have been made.
Fig. 3
5.1 Status indicator of the module (integrated in the
coding switch)
Table 46
5.2 Status indicator "1": alternative heat source
Table 47
0
1
2
3
4 5 6
7
8
9
10
0010014042-001
2 3 4 1
Status indicator Possible cause Remedy
Constantly OFF Power supply
interrupted. ▶ Turn on the mains power supply.
Faulty fuse ▶ When the power supply is
switched off, replace the fuse
(

Fig. 17 at end of this
document).
Short-circuit in the
BUS connection ▶ Check BUS connection and
repair if necessary.
Constantly red Temperature sensor
was briefly
connected
incorrectly. ▶ Turn the module off and back on.
Coding switch in
invalid position or in
intermediate
position. ▶ Adjust the coding switch
Only with stand-
alone alternative
heat source: outside
temperature sensor
faulty ▶ Check temperature sensor.
▶ If values do not match, replace
the sensor.
▶ Check voltage at temperature
sensor terminals in the module.
▶ If the sensor values match but
the voltage values do not,
replace the module.
Internal fault. ▶ Replace the module.
Flashing yellow Initialisation, i.e.
configuration wizard
is running. –
Constantly green Code switch set to 0 ▶ Adjust the coding switch
No fault Normal Operation
Status indicator Possible cause Remedy
Constantly OFF no heat requirement Normal Operation
Constantly red Temperature sensor
was briefly
connected
incorrectly. ▶ Turn the module off and back on.
Flow/return
temperature sensor
of alternative heat
source defective ▶ Check temperature sensor.
▶ If values do not match, replace
the sensor
▶ Check voltage at temperature
sensor terminals in the module.
▶ If the sensor values match but
the voltage values do not,
replace the module
Constantly yellow Heat requirement or
flue gas temperature
≥ 100 °C (with stove)
Normal operation or heat-up phase
(transitional phase to normal
operation)
Constantly green No fault Normal Operation