Troubleshooting - DBK DN125 Instructions De Montage Et D'utilisation

Troubleshooting

7. Troubleshooting
Problem Possible causes
- Supply voltage not connected
No heating
- Supply voltage not correct
power
- Control signal not connected
- Control signal < 0.5 VDC
- Temperature of the device too
- Internal fuse was triggered (not
- Temperature of the device is
No heating
power:
temporary/
cycling
- Control voltage too high
Increased
- Main controls (external) not
heating
power
- External temperature sensors
- Observe PTC effect
20 | Assembly and Operating Manual | DBK Duct Heater PTC – DN125
high: internal temperature
limiting active
replaceable)
too high: internal temperature
limiter is active intermittently
working correctly
are not installed or positioned
correctly
Solutions
- Check all cable connections.
- Check the supply voltage.
- Check the control signal
voltage.
- Check the min. air volume
flow.
- Contact the distributor
- Check the min. air volume
flow.
- Check the position and
function of external
temperature sensors.
- Check all cable connections.
- Check the heating element for
fouling
- Check the customer control
settings.
- Check the min. air volume
flow.
- Check the position and
function of external
temperature sensors.
- Briefly increased heating
power possible due to PTC
effect
Rev. a 06/2020