Bosch Condens 5000W Installation And Maintenance Instructions Manual page 36

Display codes
Code Code Designation
type
F 0 2 4 2
The burner control unit or the HCM is faulty.
F 0 2 4 3
F 0 2 4 4
F 0 2 4 5
F 0 2 4 6
F 0 2 4 7
F 0 2 4 8
F 0 2 4 9
F 0 2 5 0
F 0 2 5 1
F 0 2 5 2
F 0 2 5 3
F 0 2 5 5
F 0 2 5 9
F 0 2 6 3
F 0 2 6 7
F 0 2 7 2
F 0 2 7 8
The sensor test has failed.
F 0 2 7 9
The burner control unit or the HCM is faulty.
F 0 2 8 0
The burner control unit is faulty.
F 0 2 8 7
The burner control unit or the HCM is faulty.
F 0 2 9 0
The burner control unit or the HCM is faulty.
F 7 2 2 8
An ionisation current was measured before the
burner started.
F 7 3 2 8
A brief power failure has occurred.
F A 3 0 6
An ionisation current was measured after the
burner went out.
F d 2 3 1
The mains voltage was interrupted during an
interlocking fault.
E C 2 5 6
The burner control unit or the HCM is faulty.
E H 2 5 8
H 0 7
The actual water pressure is too low. This limits the
performance in heating mode as well as DHW
mode.
H r E
The wall mounted gas condensing boiler is reset.
r E
The wall mounted gas condensing boiler is reset.
Table 14 Operating and fault codes
36
Remedy
▶ Check plug and wiring of the burner control unit.
▶ Check the operating characteristics of the wall mounted gas
condensing boiler by replacing the burner control unit.
▶ Check cabling and plug of the sensor.
▶ Check the operating characteristics of the sensor. Replace the
component if necessary.
▶ Check plug and wiring of the burner control unit.
▶ Check the operating characteristics of the wall mounted gas
condensing boiler by replacing the burner control unit.
▶ Check the plug of the ionisation pin for damage and wear.
▶ Check ignition device for damage and wear. Replace the component
if necessary.
▶ Check whether the fault may have been caused by the presence of a
power unit, a wind turbine or other equipment that could cause an
interruption.
▶ Check the electrical installation.
▶ Inspect the ionizing part of the ignition device. Replace the
component if necessary.
▶ Check whether the gas/air ratio upstream and downstream of the
burner phase remains the same.
▶ Check whether voltage is present at the gas valve once the burner
phase has expired.
▶ Check the operating characteristics of the appliance by replacing the
burner control unit.
▶ Reset the wall mounted gas condensing boiler.
▶ Check plug and wiring of the burner control unit.
▶ Check the operating characteristics of the wall mounted gas
condensing boiler by replacing the burner control unit.
▶ Vent the heating system and wall mounted gas condensing boiler.
▶ Refill the heating system.
Condens 5000W – 6720813952 (2019/02)