45
a)
Checkout:
Has DT terminated?
Is "dEF" displayed on DB? Check that DH
energizes and Comp, ConFM, and EvapFM de-energize.
b)
DH Diagnosis:
Check for 115VAC at CB K1 connector pin #6 (O wire) to a
neutral (W wire). If 115VAC is not present, confirm that the appliance is not in the
5-minute defrost recovery period. Wait 5 minutes, then check CB K1 connector pin
#6 (O wire) to a neutral (W wire) again. If 115VAC is not present, and Comp is not
energized, replace CB. If 115VAC is present, confirm DH amperage and continuity.
c)
Comp Diagnosis:
If Comp does not de-energize, check for 115VAC at CB
K1 connector pin #10 (GY wire) to a neutral (W wire). If 115VAC is present, replace
CB. If 115VAC is not present, check continuity of Comp relay contacts. If closed,
replace Comp relay.
d1)
ConFM Diagnosis: Freezer (auxiliary code P-5 and earlier):
If ConFM does not
de-energize, check for 115VAC at CB K9 connector pin #2 (BR wire) to a neutral
(W wire). If 115VAC is present, replace CB.
d2)
ConFM Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer:
If ConFM does not
de-energize, check for 115VAC at CB K1 connector pin #10 (GY wire) to a neutral
(W wire). If 115VAC is present, replace CB. If 115VAC is not present, check
continuity of Comp relay contacts. If closed, replace Comp relay.
e)
EvapFM Diagnosis:
If EvapFM does not de-energize, check for 115VAC at
CB K1 connector pin #3 (DBU wire) to a neutral (W wire). If 115VAC is present,
replace CB.
f)
DrH, PH, and MH Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer:
If heaters do not
de-energize, check for 115VAC at CB K9 connector pin #2 (BR wire) to a neutral
(W wire). If 115VAC is present, replace CB.
B.
Defrost Termination: Defrost Recovery Step 1
1a)
Freezer (auxiliary code P-5 and earlier)–LEDs 3 (EvapFM off), 4 (Comp), and
5 (ConFM) are on:
DTh warms to 100
°
F (38
°
C). DH de-energizes. 5 minutes later,
Comp and ConFM energize.
1b)
RFH1-SSB(-HS)(-HSE) Freezer–LEDs 3 (EvapFM off), 4 (Comp and ConFM),
and 5 (DrH, PH, and MH) are on:
DTh warms to 100
°
F (38
°
C). DH de-energizes.
5 minutes later, Comp, ConFM, DrH, PH, and MH energize.
a)
Checkout:
Has DTh warmed to 100
°
F (38
°
C) or higher? Check that DH
de-energizes.
b)
DH Diagnosis:
Check for 115VAC at CB K1 connector pin #6 (O wire) to a neutral
(W wire). If 115VAC is not present, confirm that the appliance is not in the 5-minute
defrost recovery period. Wait 5 minutes, then check CB K1 connector pin #6
(O wire) to a neutral (W wire) again. If 115VAC is not present, and Comp is not
energized, replace CB. If 115VAC is present, confirm DH amperage. If amperage
is not present, check defrost thermostat and DH continuity. If amperage is present,
confirm that evaporator warms to 100
°
F (38
°
C) at DTh location. Next, check
DTh status. See "III.C. Thermistor Check." When DTh reaches 100
°
F (38
°
C), DH
de-energizes. If DH remains energized past 100
°
F (38
°
C), replace CB.