Troubleshooting; Recognising The Operating Condition And Clearing Faults; Emergency Mode - Buderus Logano plus GB402 Installation And Maintenance Instructions For Contractors

11

Troubleshooting

11 Troubleshooting
11.1 Recognising the operating condition and clearing
faults
If a fault has developed, the fault code flashes on the control unit display.
The programming unit shows faults as plain text messages.
NOTICE: System damage due to frost.
The heating system can freeze up if it has been
switched off through a fault shutdown.
▶ Rectify the fault immediately and restart the
heating system.
▶ Where that is not possible, drain the heating and
DHW pipework at the lowest point.
A fault has developed if the display flashes and indicates something
other than the current boiler water temperature or an operating
message.
Example: "6A" = the burner will not start
For an overview of the operating and fault codes, along with possible
causes and remedial measures, see the control unit  documentation
and the following Chapter 11.3 ( page 47).
▶ Hold down "Reset" for 5 seconds to clear the fault.
A reset is only possible, if a fault message is flashing. The display shows
"rE" whilst the reset is being performed.
If the display then reverts to a normal operating message, the fault has
been cleared. Should the fault reoccur, repeat the reset two or three
times.
Fig. 64 Clearing a fault with the "Reset" key
46
11.2

Emergency mode

The burner control unit automatically goes to emergency operation, if
the communication with the Logamatic MC10 control unit is interrupted.
In emergency operation the burner control unit regulates the boiler
water temperature to 60 °C to maintain the operation of the heating
system, until communications have been restored.
Clearing faults in emergency operation
In emergency operation faults can only be cleared via the reset button on
the burner control unit. Clearing is only possible, if the fault is a locking
fault.
▶ Press the reset button to clear the fault.
1
Fig. 65 Clearing a fault on the burner control unit
[1] Reset button
Logano plus GB402 – 6 720 820 700 (2018/01)
6 720 801 303-02.1T