8
TROUBLESHOOTING AND CORRECTIVE ACTIONS
SYMPTOM
CORRECTIVE ACTION: FIRST-TIME INSTALLED HAND
DRYERS
The dryer does not run
First ensure that the breaker supplying the dryer is opera-
tional. If it is, disconnect the power and remove the cover.
Taking suitable precaution to avoid shock hazard, recon-
nect the power and check for voltage on the terminal block.
Verify that connections are made correctly.
The dryer cycles by itself and
runs constantly
Ensure that there is no obstruction on or in front of the IR
sensor. Clean any dirt off the sensor lens. If problem per-
sists, replace the sensor.
The dryer is very loud and
does not run for a complete
cycle
Ensure that the supply voltage is correct. The dryer will
make a loud humming noise if the input voltage is too high.
Verify voltage requirement on the unit rating label and
correct accordingly. If PCB is damaged, replace unit as well
as IR sensor.
The dryer runs, but the
airspeed is low
Ensure that the supply voltage is correct. The dryer will run
slowly if the input voltage is too low.
SYMPTOM
CORRECTIVE ACTION: USED HAND DRYERS
The dryer does not run
First ensure that the breaker supplying the dryer is opera-
tional. If it is, disconnect the power and remove the cover.
Replace PCB and IR sensor. Taking suitable precaution to
avoid shock hazard, reconnect the power and check for vol-
tage on the terminal block.
The IR-sensor detects only
close range objects
Ensure that there is no obstruction on or in front of the IR
sensor. Clean any dirt off the sensor lens. If problem per-
sists, disconnect the power and remove the cover. Taking
suitable precaution to avoid shock hazard, reconnect the
power and try carefully adjusting the sensitivity range (yel-
low slot in blue component on PCB). If problem persists,
replace IR sensor.
The dryer gets hot, but there is
no air stream
Disconnect the power. Remove the cover and disassemble
the blower/fan unit. Replace motor.
The dryer blows only cold air
during a full cycle
Disconnect the power. Remove the cover and disassemble
the blower/fan unit. Test the thermostate for open circuit.
Check the heating element for defects. Replace defect
heating element.
The air pressure is low
Check the output nozzle for obstructions. If none, discon-
nect the power and remove the cover. Remove any dirt from
the inlet. Disassemble the blower/fan unit, check if motor
brushes are worn (≤ 10 mm graphite remains) and replace
them, if necessary.
