
FIELD REPAIR/SERVICE
BLANKETROL III, Model 233
OPERATION AND TECHNICAL MANUAL
Page 110 of 131
TROUBLESHOOTING GUIDE
OBSERVATION
POSSIBLE
PROBLEM
ACTION TO BE TAKEN
M. The unit is operating
in
MANUAL
CONTROL MODE
or
one of the automatic
modes and the
WATER display
shows an erratic
display.
Water temperature
sensor is defective.
Microprocessor board is
defective.
Replace water temperature
sensor. See Section (5-8.).
Replace the microprocessor
board. See Section (5-15.).
N. The unit is operating in
one of the three modes,
the unit momentarily
blanks and then the
Status Display flashes
CHECK SETPT.
Low line voltage or power
source.
Check line voltage. Reset Set
Point display and resume
operations.
O. The unit is operating in
one of the control
modes. When cycling to
Cool
mode, all displays
flicker on and off, the
unit goes to CHECK
SETPT in the Status
Display or SENSOR
FAULT REMOVE
FROM SERVICE or
HIGH LIMIT REMOVE
FROM SERVICE.
Low line voltage or power
source.
Check line voltage. Reset Set
Point display and resume
operations.