11.3.2 Second Service Level - Bosch Greenstar Series Installation And Service Instructions For Contractors

Heatronic boiler control settings
Service function 6.A: Display the latest fault code
Use this service function to display the most recent fault code.
Service function 6.b: Room temperature control, current voltage,
terminal 2
The current voltage of the analog control at terminal 2 is displayed.
Available displays are:
• 00 - 24: 0 V to 24 V in increments of 1 V
Service function 6.C: Supply temperature required by outdoor reset
control
This service function allows displaying the current target supply
temperature set by the outdoor reset control.
Service function 6.d: Current DHW turbine flow rate (only combi
boiler ZWB...-3A)
NOTICE
System damage or boiler malfunction!
▶ Never change the setting of this service function on heating boiler
ZBR...-3A appliances.
The current flow rate of the DHW turbine is displayed.
Service function 0.E is set to 00 (metric units):
• 0.0. - 99.9.: 0.0 to 99 l/min in increments of 0.1 l/min
Service function 0.E is set to 01 (US-customary units):
• 0.0. - 99.9.: 0.0 to 99 gpm in increments of 0.1 gpm
Service function 7.A: Indicator lamp for burner operation / faults
With this service function you can activate and deactivate the indicator
lamp for burner operation (continuously illuminated) and faults
(flashing).
The following settings are available:
• 00: Off
• 01: On
Default setting is 00.
Service function 7.b: 3-way valve in center position
After the value 01 has been saved, the 3-way valve moves to the center
position. This allows draining the system completely and removing the
motor easily.
When you exit this service function, the appliance returns to setting 00.
Service function 7.d: Connecting an external supply or low-loss
header temperature sensor
Presence of an external supply or low loss header temperature sensor is
automatically detected by default; you do not need to change any
settings.
If a sensor is disconnected, change the setting back to the default setting
00.
The following settings are available:
• 00: Once-only automatic detection of a sensor
• 01: External supply temperature sensor connected to Heatronic.
• 02: External supply temperature sensor connected to CZM100.
Default setting is 00.
60
Service function 7.E: Building drying function
This service function allows you to start and stop the building drying
function.
When the building drying function is on, you cannot adjust the appliance
gas settings.
The following settings are available:
• 00: Off
• 01: Heating operation only in accordance with the appliance or
control setting, i.e. all other heat demands are blocked.
Default setting is 00.
Service function 0.A: Do not use this setting!
Default setting is 00 (disabled).
Service function 0.d: Altitude adjustment
Input and output rates are reduced at higher altitudes due to thin air with
reduced oxygen levels.
ZBR42-3A... and ZWB42-3A... appliances are derated at 3 % per
1000 feet (305 m).
ZBR21-3A..., ZBR28-3A..., ZBR35-3A..., ZWB28-3A... and ZWB35-
3A... appliances offer altitude adjustment which compensates for the
effects of thin air, and are therefore NOT derated up to 6000 feet
(1829 m). Above 6000 feet (1829 m) a rate of 3 % per 1000 feet
(305 m) applies.
This service function is used to adjust the fan speed for high altitude
operation.
The following settings are available:
• 00: Normal
• 01: Medium
• 02: High
Setting Elevation above sea level
00 0 – ft2,000 ft (0 m – 610 m)
01 2,001 ft – 4,500 ft (611 m – 1 372 m)
02 above 4,500 ft (1 372 m)
Table 28 Altitude adjustment (service function 0.d)
Default setting is 00.
Service function 0.E: Metric or US customary units
With this service function you can set if Metric or US customary units are
displayed on the boiler.
The following settings are available:
• 00: °C, l/min (metric units)
• 01: °F, gpm (US-customary units)
Default setting is 01.

11.3.2 Second service level

Service function 8.A: Software version
The current software version is displayed.
Greenstar – 6721822579 (2021/01)