Hoshizaki AMERICA 73183 - Manual (Page 27)

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10) Check that the components restart after defrost termination.
Refrigerator: DTh reaches 40 °F (4.4°C), Comp and ConFM (CM C1 (R)) energize.
If not, check DTh status. See "II.D.Thermistor Check." If DTh ohm reading is in proper
range, and Comp and ConFM do not energize, replace DM and CM with HS kit.
Freezer: DTh reaches 59°F (15°C). 3-min. later, Comp and ConFM (CM C1 (R)) and
EvapFM (CM F6 (BK)) energize. If not, check DTh status. See "II.D.Thermistor Check."
If DTh ohm reading is in proper range, and Comp, ConFM, or EvapFM do not energize,
replace DM and CM with HS kit. 10 min. after Comp, ConFM, and EvapFM energize,
confirm cabinet temperature appears on DM. If components fail to start, replace DM
and CM with HS kit.
Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;
CTh–cabinet thermistor; DH–defrost heater; DM–display module; DS–door switch
DTh–defrost thermistor; EvapFM–evaporator fan motors
2. Control Module with Integrated Display
Before replacing CM that does not show a visible defect and that you suspect is
bad, conduct the following check procedure. This procedure will help you verify your
diagnosis. Always choose a neutral (W) to establish a good neutral connection when
checking high voltages. Also, confirm there is a good power supply and neutral
connection to CM: 115VAC at CM L2 (BK) to CM N3 (W).
Alarm Reset: To silence the alarm, press and release the up button with power on.
For alarm information, see "III.D. Alarm Safeties."
Startup/Cool Down
1) Check all wiring connections. Confirm the CTh and DTh are properly connected.
2) Move the power switch to the "ON" position.
3) Check for 115VAC at CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, check
power supply, wire connections, and power switch.
4) Check that cabinet temperature is displayed. If not, replace CM.
5) Freezer: Check that EvapFM is energized. Make sure doors are closed and DS
engaged. Next, check for 115VAC at CM F5 (Y) to neutral. If 115VAC is not present,
replace CM.
6) Check that Comp and ConFM energize. If not, check CTh status. See "II.D.Thermistor
Check." If CTh ohm reading is in proper range, check for 115VAC at CM C1 (R) to
neutral (W). If 115VAC is not present, replace CM.
Defrost
7)
Manual Defrost Check: Press the manual defrost button briefly. If on, Comp and
EvapFM icons turn off. Defrost icon turns on and "dEF" is displayed.
8) Confirm Comp, ConFM, and EvapFM (freezer) de-energize. Check for 115VAC at CM
C1 (R) to neutral (W) for Comp and ConFM, then at CM F5 (Y) (freezer) to neutral (W)
for EvapFM. If "dEF" is displayed and 115VAC is present, replace CM.
9) Freezer: Confirm DH energizes. Check for 115VAC at CM H4 (O) to neutral (W). If "dEF"
is displayed and 115VAC is not present, replace CM.