Faults; Troubleshooting; Faults That Are Shown On The Display - Bosch Greenstar combi 100 p Installation And Service Instructions For Contractors

56 | Faults

16 Faults
16.1

Troubleshooting

DANGER:
Explosion!
▶ Close the gas cock prior to working on the gas train.
▶ Check for gas leaks after carrying out work on the gas train.
DANGER:
Risk of flue gas poisoning.
▶ Check for leaks after carrying out work on the venting system.
DANGER:
Risk of electric shock!
▶ Always disconnect the appliance from the mains power before
performing any work. Always disconnect the appliance from the
mains power before performing any work.
Take measures to prevent accidental reconnection.
WARNING:
Danger of scalding!
Hot water can scald.
▶ Drain the appliance before working on components that are water
filled.
NOTICE:
Risk of system damage from freezing!
The heating system can freeze up in cold weather if it has been disabled
by a fault shutdown.
▶ Rectify the fault immediately and restart the heating system.
▶ If this is not possible, protect your heating system from freezing by
draining the heating system and hot water pipes at the lowest point.
16.2

Faults that are shown on the display

Display Description
A7 DHW temperature sensor defective.
b1 Code plug not detected.
b2/b3/b4/ Internal data error.
b5/b6
b7 Fault in the burner controls.
C6 Fan not running.
CC
Outdoor temperature sensor not recognized.
6720872361 (2017/04)
NOTICE:
The Heatronic boiler control can be damaged by leaking water.
▶ Cover the Heatronic prior to work on water filled components.
The Heatronic boiler control monitors all safety and control components.
If a fault arises during operation, an audible warning tone sounds.
Press a button to mute the warning sound.
The display indicates a fault code (e.g.
If the reset button is flashing:
▶ press the reset button and hold it until
The appliance starts up again and the current supply temperature is
displayed.
If the reset button is not flashing:
▶ Switch the appliance OFF and ON again.
The appliance starts up again and the current supply temperature is
displayed.
An overview of the faults can be found on page 56.
An overview of the status codes can be found on page 55.
If the fault persists:
▶ Check the PCB and replace if required. Adjust the service functions
in accordance with the commissioning report ( page 60).
Elimination
▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
▶ Insert code plug correctly; replace if defective.
▶ Insert code plug correctly; replace if defective.
▶ Reset boiler to the factory default setting ( service function 8.E).
▶ Reset boiler to factory to default setting ( service function 8.E).
▶ Check fan leads and fan, replace if defective.
▶ Check outdoor temperature sensor and leads for interruptions, replace if
defective.
▶ Verify the outdoor temperature sensor is connected to terminals A and F.
) and the reset button flashes.
appears on the display.
Greenstar combi 100 p / 151 p