Cabinet Defrost - Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 Service Manual

4. Cabinet Defrost

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