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(3)
EvapFM Diagnosis
UR/WR:
EvapFM continues. If not, check for 115VAC at CM
AUX 1 black-smooth (BK-SM) wire to a neutral white (W). If 115VAC is not
present, replace CM.
SR and UF/WF
: Confirm EvapFM de-energizes. If not, check for 115VAC at
CM AUX 1 black-smooth (BK-SM) to a neutral white (W). If 115VAC is present,
confirm Comp and ConFM de-energized. Next, check DTh continuity. See "II.D.
Thermistor Check." Replace as needed. If DTh confirmed, replace CM.
(4)
DH Diagnosis (SR and UF/WF)
: Confirm DH energizes. Check for 115VAC at
CM AUX 2 black (BK) wire to a neutral white (W). If 115VAC is present, confirm
Comp, ConFM, and EvapFM de-energized. Next, check DTh continuity. See "II.D.
Thermistor Check." Replace as needed. If DTh confirmed, replace CM.
2)
Defrost Termination
Manually Terminated Defrost:
Set the CTCD to the off position, then back to
original setting or unplugging and plugging back in to the electrical outlet. Defrost
terminated. If not, replace CM.
Temperature/Time Terminated Defrost
a)
UR/WR:
DTh warms to 45°F (7.2°C). Confirm continuity of DTh.
See "II.D. Thermistor Check." Replace as needed. If DTh confirmed, replace CM.
Once defrost termination achieved, EvapFM continues. C
omp and ConFM energize.
If not, see "4) Startup/Cool down" above.
b)
SR
: DTh warms to 46°F (7.7°C). DH de-energizes. Confirm continuity of DTh. See
"II.D. Thermistor Check." Replace as needed. If DTh is good and DH continues after
DTh achieves 46°F (7.7°C), replace CM. Comp, ConFM, and EvapFM energize. If
not, see "4) Startup/Cool down" above.
c)
UF/WF
: DTh warms to 55°F (12.7°C) DH de-energizes. Confirm continuity of DTh.
See "II.D. Thermistor Check." Replace as needed. If DTh is good and DH continues
after DTh achieves 55°F (12.7°C), replace CM. 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. If not, see "4) Startup/Cool down" above.
Legend:
Comp
–compressor;
ConFM
–condenser fan motor;
CLS
–cabinet light switch;
CM
–control module;
CTCD
–cabinet temperature control dial;
CTh
–cabinet
thermistor;
DH
–defrost heater;
DLT
–defrost lock-out timer;
DST
–defrost safety
thermostat;
DT
–defrost timer;
DTh
–defrost thermistor;
EvapFM
–evaporator fan
motor;
HPS
–high-pressure switch;
MH
–mullion heater;
PH
–perimeter heater
