Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 - Manual (Page 37)

37
4. Cabinet Defrost
Problem Possible Cause Remedy
[1] Cabinet fan motors
on.
a) Cabinet Fan Relay 1. Bad contacts (closed). 1. Check for continuity and
replace.
b) Control Board 1. Defective. 1. Replace.
[2] Evaporator does
not defrost
completely.
a) Defrost Thermistor 1. Defective. 1. See "II.E. Thermistor
Check."
b) Defrost 1. Not enough defrosts
occurring per day.
Operation in humid
conditions.
1. Factory default is once
every 6 hours. See "II.D.5.
Service Menu."
c) Defrost Heater 1. Defective. 1. Replace heater.
d) Defrost Thermostat 1. Defective, turning off
heaters prematurely,
or fused open.
1. Replace defrost thermostat.
e) Cabinet Liquid Line
Valve
1. Does not close. 1. Check and replace.
[3] Defrost cycle too
long. (E3 Defrost
Alarm)
a) Defrost 1. Not enough defrosts
occurring per day.
Operation in humid
conditions.
1. Factory default is once
every 6 hours. See "II.D.5
Service Menu."
b) Defrost Thermistor 1. Defective. 1. Replace.
c) Defrost Heater 1. Defective. 1. Replace heater.
d) Defrost Thermostat 1. Defective, turning off
heaters prematurely,
or fused open.
1. Replace defrost thermostat.
e) Control Board 1. Defective. 1. Replace.