UEi Test Instruments AK900SC - Manual (Page 24)

24
Display flashes
• You may be exceeding the 200psia and
550psia working ranges, or selected a
refrigerant unsuitable for the current pressure
reading.
• Disconnect pressure connection to system,
press ZERO to recalibrate
LCD has dim
contrast
• Press LCD ↑ to increase contrast
• Replace batteries with a fresh set
Display visibly
cracked
• Contact the manufacturer for service
Condensation
inside display
window
• Allow unit to warm to ambient temperature.
• Open battery compartment and allow unit to
dehumidify in a dry or air-conditioned
environment for 24 hours.
Keys do not
respond
• MIN/MAX CLR does not give visual results
when pressed in modes other than HI and LO,
but the pressure memory is cleared.
• Contact the manufacturer for service
Pressure port
loose against
case
• Tighten the speed nut using a deep socket or
wrench. Do not use excessive force. Apply
thread lock if desired
Mode changes
randomly
without MODE
key press
• When the temperature probe is installed, it
automatically enters t/sh/sc modes.
• When the temperature probe is removed, it
automatically enters normal mode.
• Check that the temperature probe is properly
installed, fully mated and locked on the plug.
Cannot access t,
SH or SC
modes
• Check that the temperature probe is properly
installed, fully mated and locked on the plug.
If either temperature sensor is defective, their
will be no t/sh/sc/dt showing up on the
display.