6.b Service function 6.b - room control voltage at terminal 2

What the display is showing

Shows the voltage of the analog room control on terminal 2, 00 to 24 V in 1 V steps. Read-only.

Applies to: Greenstar ZBR/ZWB 21-42-3A wall-hung boilers and ZWB 28-42-3A combis

What to do

1. Open service functions with the service button, scroll with the key pad lock / ECO buttons
2. Select 6.b to read it

Models that show this code

4 models in Bosch Greenstar

Other codes on the same units

• 4.F Service function 4.F - trap filling routine
• 5.A Service function 5.A - reset service-due indication
• 6.A Service function 6.A - latest fault code
• 6.C Service function 6.C - target supply temperature from outdoor reset
• 6.d Service function 6.d - DHW turbine flow rate
• 7.A Service function 7.A - burner and fault indicator lamp
• 7.E Service function 7.E - building drying function
• 7.b Service function 7.b - 3-way valve to center position