Service Manual

32
2. Freezer
7) Startup/Cool Down–MH and PH energize. There is a slight delay, then Comp, ConFM,
and EvapFM energize and cabinet temperature appears on DM. Once DTh reaches
32°F (0°C), 4-hourComp cumulative run timer starts.
a) Startup Diagnosis: Check that EvapFM energize. If not, conrm that the door(s) are
closed and DS contacts are closed. Check EvapFM blades for binding. Next, checkfor
115VAC at DSR terminals 7 and 8. If 115VAC is not present, check DS continuity. If
115VAC is present, check DSR coil continuity and contact continuity between terminals
6 and 4. If coil or contacts are open, replace DSR. Next, check for 115VAC between CM
F6 and CM N5. If 115VAC is not present, check between CM L3 and CM N5. If 115VAC
is present between CM L3 and CM N5 and not between CM F6 and CM N5, replace
CM. If 115VAC is present between CM F6 and CM N5, check EvapFM continuity.
b) Cool Down Diagnosis: Conrm that Comp and ConFM energize and cabinet
temperature appears on DM. If not, conrm 115VAC between CM L3 and CM N5. If
115VAC is not present, conrm wiring connections are secure for both the power wire
(CM L3) and the neutral (W wire) (CM N5). If 115VAC is present and DM is off, check
that the display cable between CM and DM is not disconnected; reconnect if loose. If
DM is still off, replace CM and DM. Next, check that Comp and ConFM are energized. If
not, check for 115VAC between CM C1 and CM N5. If 115VAC is present between CM
L3 and CM N5 (above) and not between CM C1 and CM N5, check CTh status. See
"IV.C.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If 115VAC
is present between CM C1 and CM N5, check for 115VAC on CR coil (terminals 5 and
6). If 115VAC is not present between CR5 and CR 6, check continuity of HPS. If open,
allow time for HPS to reset. If HPS does not reset, replace HPS and diagnose reason
for HPS activation. See "IV.A.2.7)c) HPS Activation." If 115VAC is present between
CR 5 and CR 6, and Comp and ConFM are not energized, check for 115VAC between
CR terminal 4 and neutral (W wire) and CR terminal 1 and neutral (W wire). If 115VAC
is present between CR terminal 4 and neutral (W wire) and not CR terminal 1 and
neutral (W wire), replace CR. If CR is good and Comp or ConFM are not energized,
check for 115VAC at Comp terminals, Comp protector (internal on 1-section, external on
2-section), start components, and Comp and ConFM motor winding continuity.
If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant
charge.
c) HPS Activation: Conrm ConFM is energized and fan blade turns freely. Check that the
condenser coil is not clogged or restricted. Check that there are no restrictions in the
refrigeration circuit (drier, TXV).
Conrm that the appliance location meets factory requirements:
• This appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).
• The appliance should not be located next to ovens, grills, or other high heat producing
equipment.
• The appliance should not be located in a corrosive environment.