45
Cause Measure
Exhaust air fan blockage, fault or signal interruption
■
Check fan for blockage or contamination. Remove
any blockages. Clean fan.
■
Check fan electrical connections and connecting ca-
ble.
■
Check fan is mechanically and electrically sound.
■
Replace fan if required.
16 Bypass damper
Bypass damper does not open or close.
Cause Measure
Bypass damper motor faulty Check electrical connections on the bypass damper
motor. Replace motor if necessary.
1A Opt. temp. sensor
■
External electric preheating coil is not switched on.
■
3-way diverter damper for geothermal heat
exchanger (on-site provision) is not switched.
Cause Measure
Short circuit/lead break, external temperature sensor
(geothermal heat exchanger)
Check resistance value (NTC 10 kΩ) at connection
X15.7/X15.8 on the control PCB of the ventilation unit.
Replace sensor if required: See installation and service
instructions for the ventilation unit for the curve.
1B Supply air press. sens.
■
Ventilation with a constant fan speed
■
If the outdoor air temperature is < 0 °C the factory-
fitted electric preheating coil switches on.
Cause Measure
Pressure sensor in the supply air fan is faulty, or pres-
sure hoses (red) are blocked or kinked.
■
Check the pressure hoses (red) for contamination,
kinks and damage: See installation and service in-
structions for the ventilation unit.
■
Check the pressure sensor in the supply air fan. Re-
place fan if required.
1C Extract air press. sens
■
Ventilation with a constant fan speed
■
If the outdoor air temperature is < 0 °C the factory-
fitted electric preheating coil switches on.
Cause Measure
Pressure sensor in the exhaust air fan is faulty, or pres-
sure hoses (blue) are blocked or kinked.
■
Check the pressure hoses (blue) for contamination,
kinks and damage: See installation and service in-
structions for the ventilation unit.
■
Check the pressure sensor in the exhaust air fan. Re-
place fan if required.
Troubleshooting
Message list Vitovent 300-C/300-W (cont.)
5816558
Diagnosis
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