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

Page: 121 / 216

121
ID Message (pri-
ority) 1. Cause
2. Measures Access right
AE DHW sens.
interchanged
("i") 1. DHW top/bottom interchanged. The
control unit interchanges the sensors
internally.
2. No measures required
Heating engi-
neer
AF Cylinder pri-
mary pump
("
U
")
1. Cylinder primary pump, circulation
pump for cylinder heating or two-way
valve on the cylinder primary system
faulty.
2. Check components and replace, if
required.
Customer
B0 Appliance rec-
ognition ("
U
")
1. Error in recognising appliance version,
hardware faulty, incorrect coding card.
2. Sensor input F11 must not be switched
by other equipment (see page 177).
Customer
B1 KM Bus
EEV("
U
")
1. Communication error EEV module
2. Check leads/cables, PCB refrigerant
circuit controller: Check the power sup-
ply and replace the PCB, if required
Customer
B4 A-D converter
("
U
")
1. Internal fault ADC (reference), ribbon
cable between sensor PCB and main
PCB faulty, hardware (PCB) faulty
2. Sensor connections F1, F5, F10, F15,
F19 and F22 must not be switched by
other equipment; check PCB and
replace, if required.
Customer
B5 EEPROM 1. Internal error EEPROM
2. Replace coding card Customer
B9 KM BUS solar
("
U
")
1. Communication error KM BUS solar
control unit, 3rd sensor S3 of the Vito-
solic faulty
2. Check connections and coding (7016)
(see Vitosolic installation instructions)
Customer
BA KM BUS mixer
HK ("
U
")
1. Communication error KM BUS mixer
heating circuit, internal fault extension
set for one heating circuit with mixer
2. Check appliance connections and cod-
ing
Customer
Troubleshooting
Control unit diagnostics
(cont.)
5368 522 UAE
Service