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

Page: 115 / 216

115
ID Message (pri-
ority) 1. Cause
2. Measures Access right
10 Outside temp.
sensor ("
U
")
1. Outside temperature sensor shorted
out
2. Check the sensor and replace, if
required
Customer
18 Outside temp.
sensor ("
U
")
1. Outside temperature sensor lead bro-
ken
2. Check the sensor and replace, if
required
Customer
20 Flow sens. sec.
("
U
")
1. Short circuit, secondary flow tempera-
ture sensor
2. Check the sensor and replace, if
required
Customer
21 Return sens.
sec. ("
U
")
1. Short circuit, secondary return temper-
ature sensor
2. Check the sensor and replace, if
required
Customer
28 Flow sens. sec.
("
U
")
1. Break, secondary flow temperature
sensor
2. Check the sensor and replace, if
required
Customer
29 Return sens.
sec. ("
U
")
1. Break, secondary return temperature
sensor
2. Check the sensor and replace, if
required
Customer
30 Flow sens. pri-
mary ("
U
")
1. Short circuit, primary flow temperature
sensor (IN)
2. Check the sensor and replace, if
required
Customer
31 Return sens.
primary ("
U
")
1. Short circuit, primary return tempera-
ture sensor (OUT)
2. Check the sensor and replace, if
required
Customer
38 Flow sens. pri-
mary ("
U
")
1. Break, primary flow temperature sen-
sor (IN)
2. Check the sensor and replace, if
required
Customer
39 Return sens.
primary ("
U
")
1. Break, primary return temperature sen-
sor (OUT)
2. Check the sensor and replace, if
required
Customer
Troubleshooting
Control unit diagnostics
(cont.)
5368 522 UAE
Service