Service Manual

13
CRES Factory Default Temperature Settings:
a) Setpoint: 35°F (2°C).
b) Display Scale: °F.
For further details, see "III. Controls and Adjustments."
Note:
There is a minimum 2-min. Comp on time and 2-min. Comp off time.
1) Unplug the appliance from the electrical outlet.
2) Remove the front panel.
3) Plug the appliance back into the electrical outlet.
4) Conrm 115VAC at CM L2 (BK or BR) to neutral (W).
5) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display
and Comp and EvapFM icons turn on. Comp, ConFM, and EvapFM energize.
a) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VACat
CM L2 (BK or BR) to CM N3 neutral (W). If 115VAC is not present, check power
cord connections and breaker/fuse. Conrm wiring connections are secure for both
CML2 (BK or BR) (power supply) and CMN3(W) (neutral). If 115VAC is present
and display is off, replace CM.
b) Comp/ConFM Diagnosis: Conrm Comp and ConFM energize. Ifnot, check
for 115VAC at CM C1 (BR or BK) to neutral(W). If 115VAC is not present at
CMC1(BRor BK) to neutral (W), check CTh status. See "II.C. Thermistor Check."
If CTh ohm reading is in proper range, replace CM. If 115VAC is present at CM C1
(BR or BK) to neutral(W), check continuity of HPS (if applicable). If open, allow time
for HPS to reset. If HPS does not reset, see "d) HPS Activation" below. If ConFM
is energized but Comp is not, check for 115VAC from both sides of Comp external
protector to neutral (W). If 115VAC is present on one side and not the other, allow
time for Comp external protector to cool and reset. If Comp external protector does
not reset, replace Comp external protector. If115VAC is present on both Comp
external protector wires, check Comp start capacitor, start relay, and Comp motor
windings. If ConFM is not energized, check ConFM fan blades for binding and motor
winding continuity.
If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit and correct refrigerant charge.
c) EvapFMDiagnosis:
1. CPT: Conrm EvapFM energizes. If not, check for 115VAC at CMF5(DBU) to
neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, check
EvapFM blades for binding and EvapFM continuity.
2. CRES: Conrm EvapFM energizes when Comp energizes. If not, check for 115VAC
at CM C1 (BR) to neutral(W). If 115VAC is not present, replace CM.
If115VAC is present, check for a loose wire, EvapFM blades binding, and
EvapFM continuity.
d) HPS Activation: Conrm ConFM is energized and fan blade turns freely.
Conrmcondenser coil is not clogged or restricted. Conrm there are no restrictions
in the refrigeration circuit (drier). Let refrigeration circuit pressures equalize. IfHPS
does not reset and pressures are equalized, replace HPS. Ifpressures are not
equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.