Fault messages
Cause
Measures
40
Flow sensor
HC 2
Short circuit
Check the sensor; replace if
required
44
Flow sensor NC
48
Flow sensor
HC 2
Lead broken
Check the terminals; replace
the sensor, if required
4C
Flow 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
68
Buffer cylinder
sensor
Lead broken
Check the terminals; replace
the sensor, if required
69
Secondary return
sensor
A6
Secondary pump
Secondary pump faulty
Check the secondary pump
(see page 107), replace the
pump, if required
A8
Pump HC 1
No DHW circulation
Check the external heating
circuit pump (see page 108);
replace the pump, if required
A9
Heat pump
Heat pump
Check the heat pump, the
primary pump and the sec-
ondary pump (see
page 110), and replace if re-
quired.
If an instantaneous heating
water heater is installed, the
unit goes into reduced mode
until the fault message has
been acknowledged.
After the repair has been
carried out, the heat pump
restarts only after the equip-
ment was first turned OFF.
Control unit diagnostics
(cont.)
116
Troubleshooting
55
92
968
GB
Summary of Contents for VITOCAL 200-G
Page 8: ...Certificates Declaration of conformity 201 Keyword index 202 Index cont 8 Index 5592 968 GB ...
Page 122: ...Main menu Information Menu structure overview information 122 Control settings 5592 968 GB ...
Page 187: ...Parts lists cont 187 Parts lists 5592 968 GB Service ...
Page 188: ...Parts lists cont 188 Parts lists 5592 968 GB ...
Page 189: ...Parts lists cont 189 Parts lists 5592 968 GB Service ...
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