000-199 Supply temperature readout

What the display is showing

In normal operation the 7-segment display shows the supply (heating water) temperature as a three-digit number, 00 to 199, in F by default (units can be switched with service function 0.E). Larger numbers are shown in two parts: for 0 to 999 the first digit is shown longer and then alternates with the last two digits (269 appears as 2.69 then 69), and 1000 to 9999 appears as two dashes, then the first two digits, then the last two.

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

Models that show this code

4 models in Bosch Greenstar

Other codes on the same units

• 2.C Service function 2.C - purging function
• 2.F Service function 2.F - temporary test operating mode
• 4.E Service function 4.E - appliance type detected
• 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.b Service function 6.b - room control voltage at terminal 2