Filter
Top Products
3-15
Section 3 - Service and Repair
Figure 10. 2275DWRWS/2275ZWC
REVIEW THE FOLLOWING NOTES FOR GENERAL
INFORMATION.
• The unit is equipped with a four-minute compressor-off cycle.
• The mullion heater is energized on the 2175DWRR whenever the
T3 temperature falls below 90°F.
Normal defrosting is based on a time and temperature scale. See
chart on page 3-40. Defrost ends if evaporator thermistor reaches
stop point or maximum time, whichever comes first.
THERMISTOR OUTAGE (EXCEPT DWRWS & 2275ZWC):
If the refrigerator thermistor (T1) fails, the unit will continue to
operate based on a preset time interval of 10 minutes on and 30
minutes off. The display will show “ER.”
If the evaporator thermistor (T2) fails, the unit will operate except it
will defrost solely on time and ignore the temperature reading. The
display will show “ER.” If the ambient thermistor (T3) fails, the unit
will always have the mullion heater energized. The display will show
“ER.”
THERMISTOR OUTAGE (DWRWS & 2275ZWC)
If T1 is not working, unit runs a preset time interval —
10 minutes ON, 60 minutes OFF.
If T2 is not working, unit runs a preset time interval —
10 minutes ON, 60 minutes OFF.
If either T3 or T4 is open, use 90 minutes for defrost length. These
errors do not show on the display; they are only logged on the board.
SERVICE
To check to see which relays are currently operating, hold the
COLDER key and press the ON/OFF key three times. When entering
the sequence, keep the COLDER key pressed until you completely
release the ON/OFF key for the third time. The display will cycle
through a series of numbers to tell which relays are energized. For
example, if the unit was cooling the bottom drawer the display would
show 11 20 31 40 50 61 70. The first number is the relay number. In
the second number, 1 means ON and 0 means OFF. The relay
information can be found in the Control Section.
Each relay can also be turned on and off individually to determine
whether or not the board and component are operating. If a board is
CAPILLARY TUBE
SOLENOID VALVE
SOLENOID VALVE
DRYER
CONDENSER
COMPRESSOR
EVAPORATOR
TOP
COMPARTMENT
THERMISTOR
CAPILLARY TUBE
DRYER
EVAPORATOR
DWR052
BOTTOM
COMPARTMENT
THERMISTOR
CAPILLARY TUBE
SOLENOID VALVE
SOLENOID VALVE
DRYER
CONDENSER
COMPRESSOR
EVAPORATOR
TOP
COMPARTMENT
THERMISTOR
CAPILLARY TUBE
DRYER
EVAPORATOR
DWR052
BOTTOM
COMPARTMENT
THERMISTOR