Service Guide

(3) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize.

If not, check for 115VAC at CR #6(R) to neutral (W). If 115VAC is present,

replace CR.

(4) EvapFM Diagnosis: Conrm EvapFM de-energizes. If not, check for 115VAC at

DSR 4 (DBU) to neutral (W). If 115VAC is present, replace DSR.

2a) Time-Initiated Defrost-Termination: DTh warms to 59°F (15°C). If not, conrm

DTh status. See "II.D. Thermistor Check." IfDTh is in proper range, DHde-energizes

and 3 delay timers start. If DTh has not warmed to 59°F (15°C), check DT and DH

continuity. Next, check DH amp draw.

(1) 3-min. Comp delay timer terminates: 3 min. after DH de-energizes, conrm

defrost icon turns off, Comp icon turns on, and Comp and ConFM energize.

If not, conrm cabinet temperature is warm enough for Comp and ConFM

operation. Next, check for 115VAC at CM C1 (R or V) to neutral(W). If 115VAC

is not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm

reading is in proper range, replace CM. If 115VAC is present, check for 115VAC

at CR#4(BK) to neutral (W) and CR#6(R) to neutral (W). If 115VAC is present

at CR #4 (BK) to neutral (W) but not at CR #6(R) to neutral (W), replace CR.

If115VAC is present at CR #6 (R) and Comp or ConFM are not energized, check

Comp start components, Comp protector (internal on 1-section, external on

2-section), and Comp motor winding continuity. If ConFM is not energized, check

ConFM fan blades for binding and motor winding continuity.

(2) 7-min. EvapFM delay timer terminates: (note that the 7-min. EvapFM delay

time is a maximum; if the defrost thermistor cools to 25°F (-3.9°C) before the

7-min. EvapFM delay timer terminates, EvapFM icon turns on and EvapFM

energizes): 4min. after Comp and ConFM energize, conrm EvapFM icon turns

on and EvapFM energizes. If not, conrm doors are closed and DS engaged.

Next, check for 115VAC at CMF5 (Y or W/BU) to neutral (W). If 115VAC is not

present, replace CM. If 115VAC is present, checkfor 115VAC at DSR#4(DBU) to

neutral(W). If115VAC is not present, check for 115VAC at DSR#6(Y or W/BU)

to neutral (W). If115VAC is present on DSR #6 (Y or W/BU) to neutral (W) and

not on DSR #4(DBU) to neutral (W), replace DSR. If 115VAC is present on DSR

#4 (DBU) to neutral (W) and EvapFM is not energized, check EvapFM blades for

binding and EvapFM continuity.

(3) 18-min. temperature display delay timer terminates: 11 min. after EvapFM

energizes, "dEF" is replaced by cabinet temperature on display. If not, replace

CM.

2b) Manually-Initiated Defrost-Termination: DTh warmes to 59°F (15°C). Ifnot,

conrm DTh status. See "II.D. Thermistor Check." If DTh is in proper range,

DHde-energizes and 2 delay timers start. If DTh has not warmed to 59°F (15°C),

check DT and DH continuity. Next, check DH amp draw.

(1) 3-min. Comp/ConFM and EvapFM delay timers terminate: 3 min. after DH

de-energizes, conrm defrost icon turns off, Comp and EvapFM icons turn on,

and Comp, ConFM, and EvapFM energize. If not, conrm cabinet temperature is

warm enough for Comp and ConFM operation.