Viessmann VITOCAL 300, Инструкция по установке и обслуживанию

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Fault messages Cause Measures
D4 Regulated HP 1 Air inside the heating
circuit Vent the heating circuit
Secondary pump or
heating circuit pump
stalled Check the secondary pump
or heating circuit pump
Heating circuit con-
taminated Flush the heating circuit
DA Room tempera-
ture sensor HC 1 Short circuit Check the sensor; replace if
required
DB Room tempera-
ture sensor HC 2
DD Room tempera-
ture sensor HC 1 Lead broken Check the terminals; replace
the sensor, if required
GB Room tempera-
ture sensor HC 2
Reset the high limit safety cut-out
!
Please note
Touching 'live' components in
the working area can result in
the transfer of dangerous body
currents.
Ensure the device is at zero
volts before carrying out any
electrical work and before
resetting the high limit safety
cut-out.
Note
The high limit safety cut-out is located
below the cover shielding the access
to the electrical terminals of the elec-
tric heater (at the bottom r.h. side of
the device).
1. Remove cover
A
.
2. Reset the high limit safety cut-out.
For this, push in the red button visi-
ble inside the aperture.
3. Fit cover
A
.
Control unit diagnostics
(cont.)
63
Troubleshooting
55
92
901
GB
Service