Viessmann Vitocal 350-A Installation And Service Instructions Manual page 137
Type awh-i, awh-o
air/water heat pump with electric drive, 400 v~
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Also See for Vitocal 350-A:
- Installation and service instructions manual (160 pages) ,
- Operating instructions manual (60 pages) ,
- User manual (236 pages)
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Control unit diagnostics
Message
System characteristics Cause
«4B Flow sensor system
«50 DHW sensor top
Operation with tempera-
ture value of the lower
cylinder temperature
sensor. DHW heating is
blocked if only one sen-
sor is available or both
sensors are faulty.
«52 DHW sensor bottom
Operation with tempera-
ture value of the upper
cylinder temperature
sensor. DHW heating is
blocked if only one sen-
sor is available or both
sensors are faulty.
«54 DHW solar
«58 DHW sensor top
Operation with tempera-
ture value of the lower
cylinder temperature
sensor. DHW heating is
blocked if only one sen-
sor is available or both
sensors are faulty.
(cont.)
Break, system flow tem-
perature sensor (down-
stream of heating water
buffer cylinder)
Short circuit, top cylinder
temperature sensor
Short circuit, bottom cyl-
inder temperature sen-
sor
Short circuit, Vitosolic
cylinder temperature
sensor
Break, top cylinder tem-
perature sensor
Troubleshooting
Measures
Check resistance (Pt 500)
at connections 3X1.9 and
3X2.9; replace sensor if
required.
Check resistance (Pt 500)
at connections 3X1.14
and 3X2.14; replace sen-
sor if required.
Check resistance (Pt 500)
at connections 3X1.13
and 3X2.13; replace sen-
sor if required.
Check sensor and replace
if required (see Vitosolic
installation and service
instructions).
Check resistance (Pt 500)
at connections 3X1.14
and 3X2.14; replace sen-
sor if required.
137
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