Viessmann VITOCAL 300, Инструкция по установке и обслуживанию

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Fault messages Cause Measures
48 Flow sensor
HC 2 Lead broken Check the terminals; replace
the sensor, if required
4C Flow sensor NC
4D Room tempera-
ture sensor NC
50 DHW sensor top Short circuit Check the sensor; replace if
required
52 DHW sensor bot-
tom
58 DHW sensor top Lead broken Check the terminals; replace
the sensor, if required
5A DHW sensor bot-
tom
60 Buffer cylinder
sensor Short circuit Check the sensor; replace if
required
61 Secondary return
sensor
62 Buffer cylinder,
bottom
63 Ext. heat source
64 Mixer ext. heat
source
68 Buffer cylinder
sensor Lead broken Check the terminals; replace
the sensor, if required
69 Secondary return
sensor
6A Buffer cylinder,
bottom
6B Ext. heat source
6C Mixer ext. heat
source
A8 Pump HC 1 No DHW circulation Check the external heating
circuit pump (see page 49);
replace the pump, if required
Control unit diagnostics
(cont.)
60
Troubleshooting
55
92
901
GB