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

Page: 123 / 216

123
ID Message (pri-
ority) 1. Cause
2. Measures Access right
CA Primary source
("
U
")
1. The monitoring primary source input
has responded (brine pressure, flow
meter)
2. Check safety equipment (frost protec-
tion brine pressure, frost protection AC-
Box) on terminals 3X3.9 and 3X3.8;
In systems without safety equipment
(frost protection brine pressure, frost
protection AC-Box) check jumper
across 3X3.9 and 3X3.8
Customer
CB Primary tem-
perature ("i") 1. Min. primary inlet temperature not ach-
ieved
2. Check the brine circuit for flow rate
Customer
CC Coding card
("
U
")
1. The coding card cannot be read
2. Check the coding card and replace, if
required
Customer
CD KM BUS Vito-
com ("
U
")
1. Fault KM BUS Vitocom 100
2. Check connections and connecting
cables
Customer
CE KM BUS Ext.
AE ("
U
")
1. Fault KM BUS external extension H1
2. Check connections and connecting
cables
Customer
D1 Compressor
("
U
")
1. Thermal compressor relay or safety
element of the full wave soft starter (if
fitted) has responded
2. Reset the thermal relay, check the set-
ting, perform a "reset", check the con-
nection, check the coil resistance,
adjust the phase sequence at the com-
pressor
Customer
D3 Low pressure
("!") 1. Inadequate circulation volume in the
primary circuit; air in the brine/primary
circuit or heat pump faulty; faulty pres-
sure sensor
2. Pressure switch resets itself automati-
cally, check primary pump and shut-off
facilities; have a refrigeration engineer
check the heat pump
Customer
Troubleshooting
Control unit diagnostics
(cont.)
5368 522 UAE
Service