116
Fault code dis-
played
System characteristics
Cause
Measures
1A
Circulation pump for dis-
charging buffer switches off
about 90 seconds after
switching on the control unit
Communication error on
KM-BUS
Check KM-BUS connection to dif-
ferential temperature controller.
1d
Flow rate not being moni-
tored.
No communication with
sensor
Check cables/leads and plugs.
1E
Flow rate not being moni-
tored.
Flow sensor faulty
Replace sensor.
1F
Flow rate not being moni-
tored.
Flow sensor faulty
Replace sensor.
20
Regulates without flow tem-
perature sensor (low loss
header).
Short circuit, system flow
temperature sensor
Check low loss header sensor (see
page 127)
28
Regulates without flow tem-
perature sensor (low loss
header)
Lead break, system flow
temperature sensor
Check low loss header sensor (see
page 127)
If no low loss header sensor is
connected, set code 52:0.
30
Burner blocked
Short circuit, boiler water
temperature sensor
Check boiler water temperature
sensor (see page 127)
38
Burner blocked
Lead break, boiler water
temperature sensor
Check boiler water temperature
sensor (see page 127)
40
Mixer being closed
Short circuit, flow temper-
ature sensor, heating cir-
cuit 2 (with mixer)
Check flow temperature sensor
44
Mixer being closed
Short circuit, flow temper-
ature sensor, heating cir-
cuit 3 (with mixer)
Check flow temperature sensor
48
Mixer being closed
Lead break, flow tempera-
ture sensor, heating circuit
2 (with mixer)
Check flow temperature sensor
4C
Mixer being closed
Lead break, flow tempera-
ture sensor, heating circuit
3 (with mixer)
Check flow temperature sensor
50
No DHW heating
Short circuit, cylinder tem-
perature sensor
Check cylinder temperature sensor
(see page 127)
51
No DHW heating
Short circuit, outlet tem-
perature sensor
Check the outlet temperature sen-
sor (see page 128)
58
No DHW heating
Lead break, cylinder tem-
perature sensor
Check cylinder temperature sensor
(see page 127)
59
No DHW heating
Lead break, outlet temper-
ature sensor
Check the outlet temperature sen-
sor (see page 128)
60
Fuel cell module shut down
Communication error with
fuel cell
Check LON connection
61
Fuel cell module shut down
Fuel cell fault
Inform Viessmann Technical Serv-
ices
7C
Circulation pump for dis-
charging buffer stopped
Short circuit on return
temperature sensor
aJ
Check the return temperature sen-
sor (see page 129)
7d
Circulation pump for dis-
charging buffer stopped
Lead break on return tem-
perature sensor
aJ
Check the return temperature sen-
sor (see page 129)
7E
Circulation pump for dis-
charging buffer stopped
Short circuit on top buffer
temperature sensor
)
A
Check top buffer temperature sen-
sor (see page 130).
Troubleshooting
Fault codes for gas condensing module
(cont.)
5775 636 GB
Diagnosis
Содержание C3TB
Страница 44: ...44 3 5 1 2x 2 4 7 6 Fig 43 Installation sequence Fitting the front panels 5775 636 GB Installation ...
Страница 48: ...48 14 Fig 47 Installation sequence If required for easier handling Dismantling cont 5775 636 GB Installation ...
Страница 136: ...136 Troubleshooting Repairs gas condensing module cont 5775 636 GB Diagnosis ...
Страница 143: ...143 Parts lists Heat cell assembly 5775 636 GB Components ...
Страница 148: ...148 0001 0001 0003 0003 0002 0002 0004 Fig 118 Parts lists External connection assembly 5775 636 GB Components ...
Страница 154: ...154 0006 0003 0005 0001 0002 0004 Fig 121 Parts lists Miscellaneous assembly 5775 636 GB Components ...
Страница 160: ...160 Parts not shown 0009 PCB IU100 B30 Parts lists Fuel cell assembly 5775 636 GB Components ...
Страница 161: ...161 Parts lists Fuel cell assembly cont 5775 636 GB Components ...
Страница 187: ...187 5775 636 GB ...