Cause : Temperature switch in the line filter open when powering up comes when powering up the infeed, the temperature in the line filter is too high. Powering up is prevented.

- check whether the line filter type set in p0220[0] matches the line filter that is actually connected. Ensure that the line filter specified for the infeed being used is connected or correct the setting of the line filter type in p0220[0].
- temperature monitoring is mandatory for AIM line filters (refer to p0220). Ensure that the temperature switch in the line filter is correctly and reliably connected to input X21 of the infeed.
- the filter temperature is too high. Allow the system to cool down.
- the internal fan of the line filter is defective. Replace the fan if necessary.
- defective temperature switch of the line filter. Replace the line filter if necessary.