Viessmann Vitocal 300-G Installation And Service Instructions Manual page 127

Control unit diagnostics
ID Message
(priority)
AF Cylinder pri-
mary pump
("U")
B0 Appliance re-
cognition ("U")
B1 KM Bus EEV
("U")
B4 A-D converter
("U")
B5 EEPROM
B9 KM BUS solar
("U")
BA KM BUS mixer
HK ("U")
(cont.)
1. Cause
2. Measures
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.
1. Error in recognising appliance ver-
sion, hardware faulty, incorrect cod-
ing card.
2. Sensor input F11 must not be
switched by other equipment (see
page 182).
1. Communication error EEV module
2. Check leads/cables, PCB refrigerant
circuit controller: Check the power
supply and replace the PCB, if
required
1. Internal fault ADC (reference), rib-
bon 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.
1. Internal error EEPROM
2. Replace coding card
1. Communication error KM BUS solar
control unit, 3rd sensor S3 of the
Vitosolic faulty
2. Check connections and coding
(7016)
(see Vitosolic installation instructions)
1. Communication error KM BUS mixer
heating circuit, internal fault exten-
sion set for one heating circuit with
mixer
2. Check appliance connections and
coding
Troubleshooting
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