14
The diagnostic procedure is basically a sequence check that allows you to diagnose the
electrical system and components. Before proceeding, check for correct installation and
proper voltage per appliance nameplate. When checking AC voltage (115VAC), always
choose a neutral (W) wire to establish a good neutral connection. If the control board is
in alarm, see "II.I Alarm Safeties." For further details, see "II.F.3. Control Board Check."
• If the control panel is locked, press and hold the "-" button and the power button until
"UnL" appears briefly on the display module.
• The °F and cabinet temperature LEDs remain on throughout the sequence of operation.
• This appliance uses a time-initiated/time-terminated Comp off cycle defrost. The factory
default defrost setting is once every 6 hours for 30 min.
• 6-hr. defrost timer starts the very first time CB is energized (during factory testing).
Defrost time is cumulative power on time, therefore time may vary between starting
the appliance and the first defrost. After the first defrost, defrost can be monitored for
activation every 6 hours.
• Cabinet temperature is displayed during defrost.
1) Press and hold the power button for 2 sec. to turn off the appliance.
2) Unplug the appliance from the electrical outlet.
3) Remove the top panel. Secure the top panel to prevent it from falling over when
checking voltages and CB items.
4) Secure (tape) DS in the door closed position.
5) Plug the appliance back into the electrical outlet. °F LED turns on.
Diagnosis:
Confirm
that °F LED is on. If not, check CB POWER connector for 115VAC. If 115VAC is not
present, check power supply and power cord connection. If 115VAC is present and
°F LED is not on, replace CB.
6) Press the power button for 2 sec. to turn on the appliance.
7)
Startup–EvapFM icon is on and Comp icon is flashing.
EvapFM energizes.
2-min. Comp delay timer starts. Comp icon flashes until 2-min. Comp delay timer
terminates.
Diagnosis:
Check that CT LEDs and EvapFM icon turn on. Next, check
that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC.
If 5VDC is not present, check DS activation lever and DS continuity. Note: DS contacts
are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for
12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring
connector for loose connection, EvapFM continuity, and fan blade for binding.
8)
Cool Down–EvapFM icon is on and Comp icon turns steady.
EvapFM continues.
2-min. Comp delay timer terminates. Comp energizes and 3-min. Comp run timer
starts.
Diagnosis:
Confirm CTh is at least 4
°
F above setpoint. Next, check that Comp
energizes. If not, check CB Comp connector for 115VAC. If 115VAC is not present,
confirm CTh status. See "II.G. Thermistor Check." If CTh is in range and 115VAC is not
present, replace CB. If 115VAC is present, and Comp is off, check Comp wire harness
connections. Next check Comp external protector (integrated with start relay), Comp
start components, and Comp motor winding continuity. If Comp energizes and the
cabinet does not cool down, check for air leaks around the door (gasket), a restriction in
the refrigeration circuit, or refrigerant leak.
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Страница 39: ...39 B Wiring Diagram ...
