CSZ MICRO-TEMP LT 749 - Page 58

FIELD REPAIR/SERVICE MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 58 of 75
TROUBLESHOOTING GUIDE
OBSERVATION
POSSIBLE
PROBLEM
ACTION TO BE TAKEN
Water level sensor fault.
Turn off unit. Replace/
Repair the water level
sensor. Refer to Section
(5-10).
Control board failure.
Turn off unit. Replace
Control Board. Refer to
Section (5-11).
High temperature
Check pad connections.
Wait a few minutes for
water temp to decrease or
turn off unit and allow water
temperature to cool.
Improper connections to
control board.
Correct connections to
control board. Refer to
Section (5-2.3).
Defective pump.
Turn unit off. Replace
pump. Refer to Section (5-
4).
C. Unit will heat but
pump will not run.
Defective pump.
Replace pump. Refer to
Section (5-4).
Improper connections to
control board.
Correct connections to
control board. Refer to
Section (5-2.3).
D. Pump runs but unit
will not heat.
Defective heater
Replace the heater. Refer
to Section (5-3).
Temp >1˚C over the set
point.
Check pad connections.
Wait a few minutes for
water temp to decrease.
Improper connections to
control board.
Correct connections to
control board. Refer to
Section (5-2.3).