- Air заслонка it is closed not completely.
- The heat exchanger is polluted, or bringing pipelines are squeezed.
- Management of a heater is changed or has drooped.
- Submitting and drain hoses of the heat exchanger are polluted or cracked.
- Check up a tension of cables; отладьте a course заслонки, if necessary remove extraneous subjects.
- Clean or replace the heat exchanger; check up bringing pipelines.
- Adjust or again hang up.
- Check up, if necessary replace hoses.