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10
Errors and faults
10.1
Troubleshooting
The electronics of the GCU compact
▪ signal an error by a red backlight on the display, and
▪ show a fault code on the display.
An integrated fault memory stores up to 15 fault messages that have
occurred most recently.
Depending on the operating mode, messages are also forwarded to
connected room controllers or room thermostats.
10.2
Overview of possible faults
Fault
Heating system not
No mains voltage
functioning (main
switch not illuminated,
no display)
Heating does not warm
Central heating standby switched off (e.g. the time
up
program is in economy phase, outside temperature
too high)
Heating does not warm
Heating characteristic too low
up enough
Hot water does not
Storage charging standby switched off (e.g. time
warm up
program is in economy phase)
Hot water does not
Storage tank charging temperature too low
warm up enough
Tapping rate too high
Burner output too low
Maximum burner output
Burner setting wrong
too low
Air/flue gas resistance too high
Burner does not start
Interlocking fault
Incorrect operating mode active
(21)
see "RoCon BF controller" documentation
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
Troubleshooting
1
2
3
Possible cause
10
INFORMATION
Detailed information on the control and the boiler control
panel as well as on the operating modes and parameter
settings can be found in
Chap. 6
controller" documentation that is included in the scope of
delivery.
Detecting and remedying the cause of the fault.
Non-interlocking errors (see
Chap.
long as there is a fault. Once the cause has been eliminated, the
device continues to work normally.
Interlocking errors with error code on the display
(see Chap.
10.4).
▪ Pushing the Exit button under the display for at least 5 s dis-
plays the "Special Level" and cancels the interlock (menu-
guided).
Possible solution
▪ Switch on the main switch for the boiler.
▪ Turn on the main switch of the heating room.
▪ Check / switch on the fuse house connection.
▪ Check/renew the boiler control panel fuse. Only use the same
type of fuses!
▪ Check the operating mode setting.
▪ Check the request parameter
▪ Increase the parameter value.
▪ Carry out hydraulic balancing.
▪ Check the operating mode setting.
▪ Check the request parameters.
▪ Increase the hot water target temperature.
▪ Reduce the draw-off rate, limit throughput.
▪ See fault "Maximum burner output too low".
▪ Check the burner settings and adjust if necessary
(see Chap.
7.3).
▪ Replace safety gas control block.
▪ Check the lines for contamination.
▪ If necessary, install lines with a larger line cross-section for
supply air or flue gas.
▪ Determine and repair the cause of the fault.
▪ Cancel the interlock
(see Chap.
▪ Check operating mode setting and adjust correctly. Also
check operating mode switchover by an external source (EXT
switching contact, room thermostat).
Errors and faults
and in the "RoCon BF
10.3) are indicated for as
(21)
(21)
(e.g. timer program).
(21)
(21)
(21)
(21)
10.4).
Installation and operating instructions
59
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