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22. TROUBLE SHOOTING
The following chart lists the most probable
faults. There are no internal adjustments or
user-replaceable parts.
Problem Solution
No Display
Check condition of batteries.
Check that batteries are inserted
properly.
Display
shows
“Ur“
Measurement under range (-40°C/ -
40°F)
Display
shows
“Or“
Measurement over range (150°C/
302°F)
Display
Shows
“OPEN”
No thermistor connected in the
Connector.
Display
Shows
“Err”
If display shows this message other
than during the field calibration mode,
please return the instrument for
servicing.