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

Page: 116 / 216

116
ID Message (pri-
ority) 1. Cause
2. Measures Access right
40 Flow temp.
sens HK2 ("
U
")
1. Short circuit, flow temperature sensor,
heating circuit 2 (mixer circuit)
2. Check the sensor and replace, if
required
Customer
41 Flow temp.
sens HK3 ("
U
")
1. Short circuit, flow temperature sensor,
heating circuit 3 (mixer circuit)
2. Check the sensor and replace, if
required
(see installation instructions KM BUS
mixer)
Customer
43 Flow sens. sys-
tem ("
U
")
1. Short circuit, system flow
2. Check the sensor and replace, if
required
Customer
44 Flow temp.
sens NC ("
U
")
1. Short circuit, flow temperature sensor
NC
2. Check the sensor and replace, if
required
Customer
48 Flow temp.
sens HK2 ("
U
")
1. Break, flow temperature sensor, heat-
ing circuit 2
2. Check the sensor and replace, if
required
Customer
49 Flow temp.
sens HK3 ("
U
")
1. Break, flow temperature sensor, heat-
ing circuit 3
2. Check the sensor and replace, if
required
(see installation instructions KM BUS
mixer)
Customer
4B Flow sens. sys-
tem ("
U
")
1. Break, system flow
2. Check the sensor and replace, if
required
Customer
4C Flow temp.
sens NC ("
U
")
1. Break, flow temperature sensor NC
2. Check the sensor and replace, if
required
Customer
50 DHW sens. Top
("
U
")
1. Short circuit, DHW temperature sensor,
top
2. Check the sensor and replace, if
required
Customer
Troubleshooting
Control unit diagnostics
(cont.)
5368 522 UAE