7.2 Thermistors
The wine cellar utilizes two thermistors, one as the upper zone display thermistor and the other as the
lower zone display thermistor.
The upper zone thermistor (part number 41050208) is connected to the LED display and displays the
temperature inside the upper compartment.
The lower zone thermistor (part number 41050209) is connected to the LED display and displays the
temperature inside the lower compartment.
Both thermistors individually maintain their compartment set-points by cycling the compressor along
with their individual compartment fans.
In addition each heater/fan assembly is also cycled to maintain the desired set-point. This will occur only
when a compartment set-point is greater or equal to 49˚F. When a call for heat is detected, the compres-
sor, condenser, & compartment fan will cycle off and the heater/fan for that compartment will turn on
until set-point is obtained.
The display panel will flash E3 for a failure of the upper thermistor and E4 for a lower thermistor failure.
If both thermistors fail, the code will be displayed sequentially. An audible alarm will also sound six
times every minute if either one or both thermistors fail.
7.2.1 To Check Thermistor Resistance
1) Disconnect power to the wine cellar and drop the User Interface Control Housing to access the therm-
istor connections on back side of the board. (See figures 12.35 & 12.36).
2) Unplug the appropriate connector on the rear of the User Interface board.
3) Determine the temperature of the thermistor at its present location. Refer to the following chart and
determine the approximate resistance value of the thermistor to be tested.
4) With an ohm-meter, measure the resistance of the thermistor by inserting the tips of the test leads into
the two small holes on the thermistor plug previously removed.
5) Record the resistance value shown on the ohm-meter and determine if it corresponds to the reference
chart below.
6) If the resistance value falls outside the resistance values given by 4% or greater, the thermistor needs
to be replaced.
SEE PHOTO SECTION FOR REFERENCE TO ABOVE MENTIONED FIGURES
42
2010 - Viking Preferred Service
SMR-0005
Summary of Contents for DFUW244CL
Page 6: ...Section 1 Introduction to Dual Zone 2010 Viking Preferred Service SMR 0005 ...
Page 10: ...Section 2 Dual Zone Characteristics 2010 Viking Preferred Service SMR 0005 ...
Page 16: ...Section 3 Refrigeration Systems 2010 Viking Preferred Service SMR 0005 ...
Page 27: ...Section 4 TruProtect Control Diagnostics 2010 Viking Preferred Service SMR 0005 ...
Page 30: ...Section 5 Mechanical System Components 2010 Viking Preferred Service SMR 0005 ...
Page 38: ...Section 6 Structural Components 2010 Viking Preferred Service SMR 0005 ...
Page 42: ...Section 7 Electrical Components 2010 Viking Preferred Service SMR 0005 ...
Page 50: ...Section 8 Control Components 2010 Viking Preferred Service SMR 0005 ...
Page 54: ...Section 9 Wiring 2010 Viking Preferred Service SMR 0005 ...
Page 57: ...52 J110 J111 J112 J2 J1 J4 J7 J3 9 3 Main Power Board 2010 Viking Preferred Service SMR 0005 ...
Page 58: ...9 4 User Interface 53 2010 Viking Preferred Service SMR 0005 ...
Page 59: ...Section 10 Reference Charts 2010 Viking Preferred Service SMR 0005 ...
Page 64: ...Section 11 Trouble Shooting Guide 2010 Viking Preferred Service SMR 0005 ...
Page 68: ...Section 12 Reference Photos 2010 Viking Preferred Service SMR 0005 ...
Page 71: ...2010 Viking Preferred Service SMR 0005 ...
Page 72: ...2010 Viking Preferred Service SMR 0005 ...
Page 74: ...2010 Viking Preferred Service SMR 0005 ...
Page 75: ...2010 Viking Preferred Service SMR 0005 ...
Page 76: ...2010 Viking Preferred Service SMR 0005 ...
Page 77: ...2010 Viking Preferred Service SMR 0005 ...
Page 78: ...2010 Viking Preferred Service SMR 0005 ...
Page 79: ...2010 Viking Preferred Service SMR 0005 ...
Page 80: ...2010 Viking Preferred Service SMR 0005 ...
Page 81: ...2010 Viking Preferred Service SMR 0005 ...
Page 84: ...2010 Viking Preferred Service SMR 0005 ...