DC16 will run for about one minute. Switch on again and will run for 3 - 4 seconds. Machine is clean. No corrosion on battery. Battery is reading 22 volts. If I put my finger over the nozzle to restrict airflow when started there seems to be good suction for about 2 minutes, then it stops. Switch on again and it will only run for about 3 - 4 seconds. After a few minutes it will run for about a minute when started normally.

Roger, May 2015

Is there an internal filter to stop dust getting into the motor?

Is the internal filter clean?

Is airflow to the motor restricted?

Is the motor overheating?

Is the overheat cut-out operating?

When did you last clean the filter?, May 2015