Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 120
Type awc-i-m, aw-o-m
compact heat pump with electric drive, 230 v~
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Also See for VITOCAL 300-A:
- Installation and service instructions manual (208 pages) ,
- Installation and service instructions for contractors (124 pages) ,
- Operating instructions manual (60 pages)
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Troubleshooting
Control unit diagnostics
Message
U50 DHW sensor top
U52 DHW sensor bottom Short circuit, bottom cy-
U54 DHW solar
U58 DHW sensor top
U5A DHW sensor bot-
tom
U5C DHW solar
U60 Buffer cyl.sensor
U63 Ext. heat source
U68 Buffer cyl.sensor
U6B Ext. heat source
U70 Room sensor HC1
U71 Room sensor HC2
U72 Room sensor HC3
120
(cont.)
Cause
Short circuit, top cylin-
der temperature sensor
linder temperature sen-
sor
Short circuit, Vitosolic
cylinder temperature
sensor
Break, top cylinder tem-
perature sensor
Break, bottom cylinder
temperature sensor
Break, Vitosolic cylinder
temperature sensor
Short circuit, buffer cy-
linder temperature sen-
sor
Short circuit, external
heat source temperature
sensor
Break, buffer cylinder
temperature sensor
Break, external heat
source temperature sen-
sor
Short circuit, room tem-
perature sensor heating
circuit A1
Short circuit, room tem-
perature sensor heating
circuit M2
Short circuit, room tem-
perature sensor heating
circuit M3
Measures
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
Vitosolic installation and
service instructions)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
Vitosolic installation and
service instructions)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
Check the sensor and re-
place if required (see
page 164 and 173)
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