Kerstar KV 20 Operating Instructions Manual page 6

yELLOW FLASHING WARNING LIGHT
This model is fitted with a yellow flashing LED warning light. When this light is flashing the airspeed in the
hose has dropped below 20 metres per second. This would indicate that there is an impediment to the airflow.
1. Remove hose. If LED stops flashing, the hose is blocked. Unblock the hose and try again.
2. If LED flashes with no hose connected, there is a restriction in the air filtration system. Use the following
sequence to check, replace or clean the following:
a) Disposable Microfibre bag
b) High Efficiency filter assembly
c) HEPA Cartridge filter
a
b
c
1
3
2
1
1
<20 m/s
2
3
4 2
5
3