Viessmann Vitoclima 300-S, Service Instructions Manual

Page: 16 / 56

No. Fault code Fault Cause/Remedy
5 4 3 2 1
1 ∘ ∘ ∘ ∘ ● Room temperature
sensor not connected Check sensor connection;
replace sensor
2 ∘ ∘ ∘ ● ∘ Room temperature
sensor short circuit
3 ∘ ∘ ∘ ● ● Temperature sensor of
the heat exchanger of
the internal device not
connected
4 ∘ ∘ ● ∘ ∘ Short circuit of the
temperature sensor of
the heat exchanger of
the internal device
5 ∘ ∘ ● ∘ ● Suction gas tempera-
ture sensor not con-
nected
6 ∘ ∘ ● ● ∘ (N/A)
7 ∘ ∘ ● ● ● Communication error Incompatible controllers of
the internal device and the
external unit: Replace the
controller of the internal de-
vice
8 ∘ ● ∘ ∘ ∘ No communication Check the connecting cable
between the internal device,
the external unit and earth
9 ∘ ● ∘ ∘ ● No code Check fan motor connection;
replace fan motor;
Replace the controller of the
internal device
10 ∘ ● ∘ ● ∘ (N/A)
11 ∘ ● ∘ ● ● External unit fault Change over to diagnosis of
external unit
... (N/A)
17 ● ∘ ∘ ∘ ● Protection against
icing-up
18 ● ∘ ∘ ● ∘ Defrost protection
19 ● ∘ ∘ ● ● External unit protec-
tion
Diagnosis
(cont.)
16
Troubleshooting
5692
687
GB