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Operation manual ISOTEST 4 S / 4 S
p l u s
Error messages and troubleshooting (Checklist)
Error message:
No acoustic signal after the unit is turned on
Possible Causes
Remedy
No rechargeable
battery inserted
Insert the rechargeable battery
Discharge the
rechargeable battery to
below the unit's shut-
off threshold
Replace or charge the rechargeable battery
The rechargeable
battery is defective
Replace the rechargeable battery or its fuse
Error message:
Acoustic signal approx. 3 seconds after power up
Error Message
Possible Causes
Remedy
●↔○
The LED flashes green
Low battery charge
Replace or charge the
rechargeable battery
●↔●
The LED alternately
flashes yellow/green
Missing or incorrectly
connected grounding
plug
The grounding plug
should be inserted
until it reaches a stop
●↔○
The LED flashes red
(safety shut-off)
The safety button was
pressed during power-
up
Release the safety
button during power-
up. After the LED has
changed its color from
red to green, the unit
is ready for use.
●↔●
The LED alternately
flashes yellow/red
Automatic integration
of the spark gap is not
possible
Turn the unit off.
If the error message is
still displayed after the
unit was turned on
again, ship the unit to
the manufacturer for
inspection.
