Service Manual

Table Of Contents

2. Freezer

5) Startup/Cool Down– MH, PH, DrH, and TXVH energize. There is a slight delay, then

Comp, ConFM, and EvapFM energize. Cabinet temperature appears on display and

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

a) MH and PH Diagnosis: PH and MH energize at startup. If 115VAC is present, check

amp draw of PH and/or MH. If an amp reading is not present, check the continuity of

PH and MH. If defective, replace PH or MH.

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

115VAC at DrH black wire (BK) to neutral (W). If 115VAC is not present, check wiring

connections to DrH. If 115VAC is present, check DrH continuity. If open, replace DrH.

c) TXVH Diagnosis: Conrm amp draw of TXVH. If no amp draw available, check

for 115VAC at TXVH grey wire (GY) to neutral (W). If 115VAC is not present, check

wiring connections to TXVH. If 115VAC is present, check TXVH continuity. If open,

replace TXVH.

d) Cabinet Light Diagnosis: Open the door (upper on HS/HG), conrm CL energizes.

If not check for 115VAC at CM 2 (L) (BK) to neutral (W) and CM 6 (Y) (LED) to

neutral (W). If 115VAC is not present at CM 2 (L) (BK), conrm power supply. If

115VAC is present at CM 2 (L) (BK), check DS continuity. If DS is disengaged and

contacts are closed, replace DS. IfDS is de-energized, and 115VAC is not present

at CM 6 (Y) (LED)to neutral (W), replace CM. If DS is de-energized and 115VAC is

present at CM 6 (Y) (LED) to neutral (W) and LEDs are not on, check for 24VDC at

DCD black (BK) 24VDC wire to DCD red (R) 24VDC 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 wiring harness and wiring connections from DCD to LED.

Ifconnections are good and LEDs are not on, replace LEDs.

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

CM 2 (L) (BK) to CM 3 (N) neutral (W). If 115VAC is not present, check power cord

connections and breaker/fuse. Conrm wiring connections are secure for both

CM 2 (L) (BK) (power supply) and CM3 (N)(W) (neutral). If 115VAC is present and

display is off, replace CM.