Viessmann Vitocal 300-G BW, Installation And Service Instructions Manual

Page: 118 / 216

118
ID Message (pri-
ority) 1. Cause
2. Measures Access right
70 Room tempera-
ture sensor
HK1 ("
U
")
1. Short circuit, room temperature sensor,
heating circuit 1
2. Check the sensor and replace, if
required
(see Vitotrol installation instructions)
Customer
71 Room tempera-
ture sensor
HK2 ("
U
")
1. Short circuit, room temperature sensor,
heating circuit 2
2. Check the sensor and replace, if
required
(see Vitotrol installation instructions)
Customer
72 Room tempera-
ture sensor
HK3 ("
U
")
1. Short circuit, room temperature sensor,
heating circuit 3
2. Check the sensor and replace, if
required
(see Vitotrol installation instructions)
Customer
73 Room tempera-
ture sensor NC
("
U
")
1. Short circuit, room temperature sensor
NC
2. Check the sensor and replace, if
required
Customer
78 Room tempera-
ture sensor
HK1 ("
U
")
1. Break, room temperature sensor, heat-
ing circuit 1
2. Check the sensor and replace, if
required
(see Vitotrol installation instructions)
Customer
79 Room tempera-
ture sensor
HK2 ("
U
")
1. Break, room temperature sensor, heat-
ing circuit 2
2. Check the sensor and replace, if
required
(see Vitotrol installation instructions)
Customer
7A Room tempera-
ture sensor
HK3 ("
U
")
1. Break, room temperature sensor, heat-
ing circuit 3
2. Check the sensor and replace, if
required
(see Vitotrol installation instructions)
Customer
7B Room tempera-
ture sensor NC
("
U
")
1. Break, room temperature sensor natu-
ral cooling
2. Check the sensor and replace, if
required
Customer
Troubleshooting
Control unit diagnostics
(cont.)
5368 522 UAE