Service Manual

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2a) Manually-Terminated: Set the CTCD to the off position, then back to original setting
or unplugging and plugging back in to the electrical outlet. Defrost terminated.
2b) Temperature or Time Terminated:
(1) UR/WR: 45°F (7.2°C) achieved or 55-min. backup DT terminates. If CTh calling
for cooling, Comp and ConFM energize. EvapFM continues.
(2) SR: 46°F (7.7°C) achieved or 45-min. backup DT terminates.
DH de-energizes. Comp, ConFM, and EvapFM energize.
(3) UF/WF: 55°F (12.7°C) achieved or 1-hr. backup DT terminates.
DH de-energizes. 3-min. DOT starts. 3-min. DOT terminates. If CTh calling for
cooling, Comp, ConFM, PH, and MH energize. Once evaporator temperature
achieves 10°F (-12.2°C) or 3-min. EvapFM delay timer terminates, EvapFM
energizes.
Defrost Diagnosis
1) Manually Initiated: Unplug the appliance from the electrical outlet, then move the
CTCD to the off position. Plug the appliance back in to the electrical outlet. The
green, yellow, and red LED turn on. Rotate the CTCD clockwise to position 4(green
and red LED turn off, yellow LED remains on), move counter-clockwise to position 2
(yellow LED turns off and red LED turns on), move back clockwise again to position
8 (red LED remains on and green LED turns on). Defrost initiates. Note: Once at
the number position, conrm the appropriate LEDs turn off and on. If not, move the
CTCD back and forth until the LED turns on. Once the LED is on, move to the next
position. After several attempts and the LEDs do not turn on and off as listed above,
replace the CM. If defrost does not initiate after all the LEDs properly turn on and
off, replace the CM. Once initiated, see component diagnosis below in "3) Time
Initiated."
2) Temperature Initiated:
a) UR/WR: Has 1-hr. DLT terminated? Has DTh cooled to -4°F (-20°C) or lower?
b) SR: Has DTh cooled to -4°F (-20°C) or lower?
c) UF/WF: Has 1-hr. DLT terminated? Has DTh cooled to -31°F (-35°C) or lower?
(1) DTh Diagnosis: If DTh has cooled to proper temperature, conrm DTh status.
See "II.D. Thermistor Check."
(2) CM Diagnosis: Check that CM red and green LEDs turn on. If not, and DTh ohm
reading is in proper range, replace CM.
3) Time Initiated: 5-hr. cumulative compressor run timer terminates.
(1) CM Diagnosis: Conrm green and yellow LEDs turn on. If not, After attempting
CTCD sequence several times and defrost still not initiated, wait 1 to 2min. and
repeat process. If defrost cycle still not activated, replace CM as needed.
(2) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize.
If not, check for 115VAC at CM Comp violet(V) wire to a neutral white (W) wire.
If 115VAC is present, Check DTh continuity. See "II.D. Thermistor Check."
Replace as needed. If DTh conrmed, replace CM.