Service Guide

2b. Freezer: Auxiliary Code F-8 and Later

7) Startup/Cool Down–Lights and DrH energize. There is a slight delay, then Comp,

ConFM, EvapFM, MH, and PH energize. Cabinet temperature appears on display and

5-hr.Comp cumulative run time defrost timer starts.

a) Cabinet Light FGE (FGECR & FGECL) Diagnosis: Open the door conrm CLS is in

the ON position. If not, move CLS to the ON position.

LEDs turn on. If LEDs do not turn on, check for 115VAC at CLS yellow (Y) wire

to neutral(W) and CLS black (BK) wire to neutral (W). If 115VAC is present at

CLSyellow (Y) wire and not at CLS black (BK) wire, conrm continuity of CLS switch.

IfCLS is engaged and CLS switch is open, replace CLS. IfCLS is engaged, contacts

are closed, and 115VAC is present at CLSblack (BK) wire to neutral (W) and LEDs

are not on, check for 24VDC at DCD output black (BK) wire to DCD output red (R)

wire. If 24VDC is not present, check continuity of DCD driver. If open, replace DCD

driver. If 24VDC is present and LEDs are not on, check wire harness and wiring

connections from DCD to LED. If connections are good and LEDs are not on, replace

LED.

FS/HS CL Diagnosis: Open the door (upper on HS) and conrm CL is energized.

Ifnot, with the door open, check for 115VAC at DSR #5 (BK) to neutral(W) and DSR

#1 (Y) to neutral(W). If115VAC is not present at DSR #5 (BK), conrm power supply

and continuity of power switch. If 115VAC is present at DSR #5 (BK) and not present

at DSR #1 (Y), check DS continuity. IfDS is disengaged and contacts are closed

(DSR energized), replace DS. If DSR is de-energized and 115VAC is present at

DSR#5(BK) and not at DSR #1 (Y) to neutral (W), replace DSR.

If 115VAC is present at DSR #1 (Y) and CL is not energized, replace CL.

b) DrH Diagnosis: Conrm amp draw of DrH. If no amp draw available, check for

115VAC to DrH black wire (BK) to neutral (W). If 115VAC is present, check DrH

continuity. If open, replace DrH. If 115VAC is not present, check wiring connections to

DrH.

c) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VAC

at CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, conrm wiring

connections are secure on CM L2 (BK) (power supply) and CM N3 (W) (neutral).

If115VAC is present and display is off, replace CM.

d) Comp and ConFM Diagnosis: Conrm Comp and ConFM energize. If not, check for

115VAC at CM C1 (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 not in

range, replace thermistor. If115VAC is present at CM C1 (V) to neutral (W), check

for 115VAC at CR #0 (P) to CR #1 (W). If 115VAC is not present, check continuity

of HPS. Ifopen, allow time for HPS to reset (cut out: 490 ±10 PSIG, cut in: 370 ±20

PSIG). If HPS does not reset, see "g) HPS Activation" below. If HPS is closed and

115VAC is present, check for 115VAC at CR #4 (BK) and CR #6 (R) to neutral (W).

If115VAC is present at CR #4 (BK) and not at CR #6(R), replace CR. If115VAC is

present at CR #6 (R) to neutral (W) and ConFM is energized but Comp is not: On

1-section; Give time for internal protector to cool and reset. Next, check run capacitor,

start capacitor, start relay, and Comp motor windings. If Comp does not start, replace

Comp. On 2-section; Check for 115VAC at Comp external protector to neutral (W).

If 115VAC is not present, give time for Comp external protector to cool and reset.