Viessmann LB1 - Page 41

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05. Outdoor air temp. sens.
Ventilation unit is switched off.
Cause Measure
Short circuit/lead break, outdoor air temperature sensor Check resistance value (NTC 10 kΩ) of ventilation unit
sensor: Replace sensor if required: See
"Vitovent 200-C" installation and service instructions for
the curve.
06 Supply air temp. sens.
Ventilation unit is switched off.
Cause Measure
Short circuit/lead break, supply air temperature sensor Check resistance value (NTC 10 kΩ) of ventilation unit
sensor: Replace sensor if required: See
"Vitovent 200-C" installation and service instructions for
the curve.
07 Extract air temp. sens.
Ventilation unit is switched off.
Cause Measure
Short circuit/lead break, extract air temperature sensor Check resistance value (NTC 10 kΩ) of ventilation unit
sensor: Replace sensor if required: See
"Vitovent 200-C" installation and service instructions for
the curve.
0E Emerg. mode, vent. unit
■
"Background vent." is switched on.
■
Bypass blocked.
Cause Measure
Another fault has occurred, e.g. sensor fault. Message
does not occur on its own.
Perform steps according to the other messages.
0F Emerg. shutdown
Fans are switched off.
Cause Measure
Short circuit/lead break, outdoor air temperature sensor
and/or extract air temperature sensor
Check resistance value (NTC 10 kΩ) of ventilation unit
sensor. Replace sensor if required: See
"Vitovent 200-C" installation and service instructions for
the curve.
10 Shutdown PHR
Defrost function without electric preheating coil is
being used.
Troubleshooting
Message list Vitovent 200-C (cont.)
5816558
Diagnosis