Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 User Manual download pdf (Page 31)

5. Defrost Thermistor (cabinet) Malfunction Alarm (E8)

Ifthecontrolboarddetectsanopendefrostthermistor,"E8"isdisplayed.Whenthe

control board detects a shorted defrost thermistor, a 10-minute delay timer begins. After

the10‑minutedelaytimerexpires,"E8"isdisplayed.Tobypassthe10‑minutedelay

timer,movethepowerswitchtothe"OFF"position.Then,whilepressingtherail"SET"

button,movethepowerswitchtothe"ON"position.

•Ifthisalarmappears,rstmakesurethatthethermistorisproperlyconnectedtothe

control board.

•Ashorteddefrostthermistorisnotdetectedbythecontrolboardduringthe1sthour

after power is turned on. To bypass the 1-hour delay timer, move the power switch to

the"OFF"position.Then,whilepressingtherail"SET"button,movethepowerswitch

tothe"ON"position.

Reset Options

The alarm automatically resets when one of the following conditions is met:

•Thedefrostthermistorissecuredtothecontrolboard.

•Thedefrostthermistoriswithinnormaloperatingrange.Fordetails,see"II.E.Thermistor

Check."

•Afunctioningdefrostthermistorisinstalled.

Possible Causes

•Troublewiththedefrostthermistor.Forcheckoutprocedure,see"II.E.ThermistorCheck."

•Troublewiththecontrolboardreadingthedefrostthermistor.

E8 Alarm (short circuit) Reset

Under 10 min.

E8 (short circuit )

Detection Point

122°F (50°C)

Temperature

Display

Blinking

E8 Alarm

(open circuit)

Reset

E8 Alarm Timer Start

E8 Alarm

Timer Start

Temperature Display

E8 Alarm (open circuit)

Detection Point

-67°F (-55°C)

Blinking

10 min.

Alarm

5a. Secondary Defrost Thermistor (Rail, not used)

The secondary defrost thermistor (located behind the wire cover) is not used for

operation of the unit. It is used for control board programming and should not be

removed.An"E8"alarmoccurswhenthesecondarydefrostthermistorisremovedor

fails.Fordetails,see"III.A.6.DefrostThermistor(cabinet)MalfunctionAlarm(E8)."

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