41
B.
Defrost Initiation Diagnosis
a)
Thermistor Diagnosis:
Has DTh cooled to 13°F (-10°C) (8°F (-13°C) for
Pass-Thrus) or lower?
Confirm DTh status, see "III.C. Thermistor Check."
b)
Comp Diagnosis:
Confirm that Comp de-energizes. If not, check for 115VAC at K1
connector pin #10 (GY wire) to a neutral (W wire). If 115VAC is present, replace CB.
If Comp is on and 115VAC is not present, check Comp relay for sticking contacts.
c1)
ConFM Diagnosis: Refrigerator:
Check for 115VAC at CB K9 connector pin #2
(BR wire) to a neutral (W wire). If 115VAC is not present, replace CB. If 115VAC is
present, check that ConFM blade is not binding and ConFM continuity is good.
c2)
ConFM Diagnosis: RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator
: Check for 115VAC
at K1 connector pin #10 (GY wire) to a neutral (W wire). If 115VAC is present,
replace CB. If Comp is on and 115VAC is not present, check Comp relay for sticking
contacts.
d)
EvapFM Diagnosis:
Check for 115VAC at CB K1 connector pin #3 (DBU wire) to a
neutral (W wire). If 115VAC is present, check that EvapFM blade is not binding and
that EvapFM continuity is good.
C.
Defrost Termination
1a)
Refrigerator–LEDs 4 (Comp) and 5 (ConFM) are on. LED 3 (EvapFM on) is off:
DTh warms to 40
°
F (4
°
C). EvapFM and ConFM continue. 2.5 minutes later Comp
energizes.
1b)
RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator–LEDs 4 (Comp and ConFM) and
5 (unused) are on. LED 3 (EvapFM on) is off
: DTh warms to 40
°
F (4
°
C). EvapFM
continues. 2.5 minutes later Comp and ConFM energize.
a)
Thermistor Diagnosis:
Has DTh warmed to 40
°
F (4
°
C) or higher? Confirm DTh
status, see "III.C. Thermistor Check."
b)
Comp Diagnosis:
Confirm that after 2.5 min. Comp delay timer terminates, CB
LED 4 turns on and Comp energizes. If not, check for 115VAC at CB K1 connector
pin #10 (GY wire) to a neutral (W wire). If 115VAC is not present, replace CB.
If 115VAC is present, check for 115VAC at Comp relay black (BK wire) and red
(R wire) to a neutral (W wire). If 115VAC is not present on the black (BK wire),
check wiring connections. If 115VAC is present on black (BK wire) but not on the
red (R wire), Comp relay contacts are open. Confirm 115VAC on Comp relay coil
gray (GY wire) to a neutral (W wire). If 115VAC is present, and contacts are open,
replace Comp relay. Next, if 115VAC is present on the red (R wire), check continuity
of Comp overload. If overload is closed, check start capacitor, start relay, and Comp
motor winding. If overload is open, let overload cool and reset. Replace if it does not
reset. When overload closes, if Comp still does not start, check start capacitor, start
relay, and Comp motor winding.
c1)
ConFM Diagnosis: Refrigerator:
If ConFM is not energized, check that LED 5
is on. Next, check for 115VAC at CB K9 connector pin #2 (BR wire) to a neutral (W
wire). If 115VAC is not present, replace CB. If 115VAC is present, check that ConFM
blade is not binding and ConFM continuity is good.
