Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 119
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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Control unit diagnostics
Message
U20 Flow sens. second-
ary
U21 Sec. return sensor
U28 Flow sens. second-
ary
U29 Sec. return sensor
U30 Flow sensor pri-
mary
U31 Primary return
sens.
U38 Flow sensor pri-
mary
U39 Primary return
sens.
U40 Flow sensor HC2
U41 Flow sensor HC3
U43 Flow sensor system Short circuit, system
U48 Flow sensor HC2
U49 Flow sensor HC3
U4B Flow sensor system Break, system flow tem-
(cont.)
Cause
Short circuit, secondary
flow temperature sensor
Short circuit, secondary
return temperature sen-
sor
Break, secondary flow
temperature sensor
Break, secondary return
temperature sensor
Short circuit, air inlet
temperature sensor
Short circuit, air outlet
temperature sensor
Break, air inlet tempera-
ture sensor
Break, air outlet tem-
perature sensor
Short circuit, flow tem-
perature sensor heating
circuit M2 (mixer circuit)
Short circuit, flow tem-
perature sensor heating
circuit M3 (mixer circuit)
flow temperature sensor
Break, heating circuit
M2 flow temperature
sensor
Break, flow temperature
sensor heating circuit
M3
perature sensor
Troubleshooting
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
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)
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)
119
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