Bosch Greenstar Series, Installation And Service Instructions For Contractors, Page: 56 / 80

Heatronic boiler control settings
Greenstar – 6721822579 (2021/01) 56
11.2 Overview of the service functions
11.2.1 First service level (press and hold the service button
until it lights up)
Table 26 Service functions, 1st level
11.2.2 Second service level (at first service level, service button
lights up, press ECO button and key pad lock button
simultaneously until 8.A appears)
Table 27 Service functions, 2nd level
11.3 Description of the service functions
11.3.1 First service level
Service function 1.A: Maximum space heating output
Some gas supply companies offer a performance-dependent basic
price.
The output can be limited in percent between the minimum and
maximum nominal output to suit the specific heat demand.
Even if the heating output has been limited, the maximum nominal
output is still available for DHW generation.
▶ Select service function 1.A.
▶ Select heat output in MBH (kW) and determine associated setting in
percent (%).
▶ Enter the setting (

Chapter 10.1).
▶ Save the setting (

Chapter 10.1).
▶ Record the set heat output in the commissioning log (

page 78).
▶ Exit the service functions.
The display returns to the supply temperature.
The factory setting is the maximum nominal output: 100 (100 %).
Service function
Display Page
1.A Maximum space heating output 56
1.b Maximum DHW output 57
1.E Pump mode for space heating operation 57
1.F Pump mode 57
2.A Heating circuit pump lockout time 57
2.b Maximum supply temperature 57
2.C Purging function 57
2.d Thermal disinfection 57
2.F Operating mode 58
3.A Automatic anti-cycle function 58
3.b Set anti-cycle time 58
3.C Switching differential (hysteresis) 58
3.d Minimum output (heating and DHW) 58
3.E Cycle time, keeping DHW hot 58
3.F Constant DHW period 59
4.b Maximum heat exchanger temperature 59
4.d Audible fault warning tone 59
4.E Appliance type 59
4.F Condensate trap filling sequence 59
5.A Reset inspection interval 59
5.b Fan post purge time 59
5.E Functionality of black plug in boiler
junction box 59
5.F Set inspection interval 59
6.A Display the latest fault code 60
6.b Room temperature control, current voltage,
terminal 2 60
6.C Supply temperature required by outdoor reset
control 60
6.d Current DHW turbine flow rate 60
7.A Indicator lamp for burner operation / faults 60
7.b 3-way valve in center position 60
7.d Connecting an external supply or low-loss header
temperature sensor 60
7.E Building drying function 60
0.A Do not use this setting! 60
0.d Altitude adjustment 60
0.E Metric or US customary units 60
Service function
Display Page
8.A Software version 60
8.b Code plug number 61
8.C GFA Gas burner control status
a
a. GFA: Gas burner control unit
61
8.d GFA fault 61
8.E Restore boiler to factory settings 61
8.F Permanent ignition 61
9.A Constant mode 61
9.b Current fan speed 61
9.C Current boiler output 61
9.d Set fan start speed 61
9.E Turbine signal delay 61
9.F Heating zone pump post purge 61
A.b Display DHW temperature 61
A.C Display DHW tank temperature 61
b.F Solar DHW backup heating delay 61
C.d Display current heat demand 61