Error Codes - Bosch Singular 4000 User Manual

User Manual

5.2 Error Codes

If an error code appears on the digital display, refer to the following chart for the
reason, and a possible remedy for the situation. If the situation requires more
support please contact Bosch at 866-642-3198.
Error Code Cause
 Abnormal operation: FAN
A2
 Abnormal operation: Pump
A3
 Overheating of heat exchanger
A4
 Low water pressure
A5
 Ignition error
A6
 Abnormal operation: gas valve relay "open"
A7
 Abnormal operation: flame detection
A8
 Overheating
AA
 Abnormal operation: heat exchanger temperature sensor
AB
 Abnormal operation: DHW temperature sensor
AC
 Clog of condensate trap
AD
 Blockage of flue Pipe
AE
 Abnormal operation: Outdoor temperature sensor
E0
 Abnormal operation: Exhaust temperature sensor
E1
 Abnormal operation: Exhaust temperature overheating
E2
 Abnormal operation: Return water temperature sensor
E3
 Abnormal operation: Pressure sensor
E4
 Abnormal operation: gas valve relay "Close"
E7
 Overheating of DHW temperature sensor
EB
 Abnormal operation:Data Communication
EE
 Abnormal operation: eep-rom error
EF
Table 9
1 8 |
Self-diagnosis/Action
1. Clean the intake air fi lter.
2. Check the fan connector.
3. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Turn off the system for at least 30 minutes, and then restart it.
2. Contact original installer or licensed professional.
1. Water supplementation of manual
2. Contact original installer or licensed professional.
1. Ensure that the main gas supply valve is open.
2. Contact original installer or licensed professional.
1. Turn off the main gas valve.
2. Contact original installer or licensed professional.
1. Turn off the main gas valve.
2. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Clean the vent terminal.
2. Contact original installer or licensed professional.
1. Check the outdoor temperature sensor wiring connection.
2. Contact original installer or licensed professional.
1. Check the exhaust temperature sensor wiring connection.
2. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
1. Contact original installer or licensed professional.
Singular Combi Boiler - BTC 439003302 A (2021/03)