123
Fault messages
Fault code
System characteristics
Cause of fault
Remedy
20F1
Insufficient distilled
water.
Top up distilled water (commissioning
mode 3).
42F0
Insufficient heating
water in fuel cell cir-
cuit.
Top up heating water.
A8F0
No power generation
Gas supply interrup-
ted
Check gas supply.
Other fault mes-
sages
Inform Viessmann Technical Services.
Repairs (gas condensing module)
Putting the control unit into the service position
If required for commissioning and servicing, the control
unit can be put into a different position.
1.
3.
2.
4.
Fig. 91
Draining the system on the heating water and DHW sides
Only when necessary for repair work.
Troubleshooting
Fault display, fuel cell module
(cont.)
5775 636 GB
Diagnosis
Summary of Contents for C3TB
Page 136: ...136 Troubleshooting Repairs gas condensing module cont 5775 636 GB Diagnosis ...
Page 143: ...143 Parts lists Heat cell assembly 5775 636 GB Components ...
Page 160: ...160 Parts not shown 0009 PCB IU100 B30 Parts lists Fuel cell assembly 5775 636 GB Components ...
Page 161: ...161 Parts lists Fuel cell assembly cont 5775 636 GB Components ...
Page 187: ...187 5775 636 GB ...