Service Guide

26
Comp and ConFM: 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.
EvapFM: 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.
(2) 15-min. temperature display delay timer terminates: 12 min. after Comp,
ConFM, and EvapFM energize, "dEF" is replaced by cabinet temperature on
display. If not, replace CM.
Legend: CL–cabinet light; CLS–cabinet light switch; CM–control module;
Comp–compressor; ConFM–condenser fan motor; CR–compressor relay;
CTh–cabinet thermistor; DCD–direct current driver; DH–defrost heater; DrH–drain
heater; DSR–door switch relay; DT–defrost thermostat; DTh–defrost thermistor;
EvapFM–evaporator fan motors; HPS–high-pressure switch; MH–mullion heater;
PH–perimeter heater; TXV–thermostatic expansion valve