CSZ MICRO-TEMP LT 749 - Page 60

FIELD REPAIR/SERVICE MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 60 of 75
TROUBLESHOOTING GUIDE
OBSERVATION
POSSIBLE
PROBLEM
ACTION TO BE TAKEN
H. Audible indicator
sounds.
Temperature readout
indicates 111˚F / 44˚C or
higher.
Unit has reached high limit.
Turn unit off and allow unit
to cool. Service required.
Power failure.
Restore power to the unit.
Unit tilted.
Place the unit on a level
surface.
Temp >1˚C over set
point.
Check pad connections.
Wait a few minutes for
water temp to decrease.
Water level sensor fault.
Turn OFF unit and make
repairs based on the
display message. Refer to
Section (3-5-B).
Water Temperature
Sensor defect.
Service unit.
Membrane Keypad fault.
Service unit.
Microprocessor failure.
Service unit.
I. Red “Power
Failure/Caution” LED
on
Water too hot.
Check pad connections.
Wait a few minutes for
water temperature to
decrease. If the display
alternates between flashing
“HL” and the actual water
temperature, turn unit off,
allow unit to cool and then
service required.