Evaporator Is Frozen Up; Defrost Fails To Terminate; Other - Hoshizaki Commercial Series Service Manual

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2. Evaporator is Frozen Up

Problem
[1] Evaporator does
not defrost
completely.
[2] Compressor on
during defrost.
[3] Evaporator fan
on (freezer).

3. Defrost Fails to Terminate

Problem
[1] Defrost cycle
too long.

4. Other

Problem
[1] Condensate
pump not
operating.
[2] Abnormal Noise. a) Fasteners
[3] Condensate
water overflow.
Possible Cause
a) Defrost Thermistor
b) Control Module
c) Defrost Heater (freezer)
d) Defrost Thermostat Open
(freezer)
a) Control Module
a) Control Module
Possible Cause
a) Defrost Thermistor
b) Control Module
Possible Cause
a) Power Supply
b) Float Switch
c) Pump Motor
d) Tubing
b) Compressor
c) Fan (evaporator or
condenser)
d) Door Switch Relay
a) Cabinet Contents
b) Location of Unit
c) Seals
d) Environment
e) Condensate Pump
1. Out of position or defective.
1. Defective.
1. Defective.
1. Defective.
1. Defective.
1. Defective.
1. Out of position or defective.
1. Defective.
1. Loose wire or connection.
1. Sticking.
1. Defective.
1. Restricted or defective.
1. Loose fasteners allow
vibration of part.
1. Problem with mount.
2. Floodback to compressor.
3. Defective.
1. Fan blade loose.
2. Defective motor.
1. Chattering.
1. Loading of large volumes
of warm, moist, uncovered
product.
1. Unit located near high
humidity source such as
fryer, steamer, etc.
1. Poor sealing around
evaporator, door gaskets.
1. Extreme environment and
door-opening conditions.
1. Not operating.
32
Remedy
1. Reposition or replace. See "IV.C.
Thermistor Check."
1. See "IV.B. Control Module Check."
1. Replace.
1. Replace.
1. See "IV.B. Control Module Check."
1. See "IV.B. Control Module Check."
Remedy
1. Reposition or replace. See "IV.C.
Thermistor Check."
1. See "IV.B. Control Module
Check."
Remedy
1. Correct or replace loose wire or
connection.
1. Clean, check continuity. Replace.
1. Replace.
1. Clean or replace.
1. Tighten fasteners.
1. Properly mount compressor.
Replace any missing grommets.
2. Check for signs of floodback
to compressor. Evacuate and
recharge if necessary.
3. Replace.
1. Adjust and tighten.
2. Replace.
1. Replace.
1. Allow product to cool before
placing in cabinet. Cover
product with plastic wrap.
1. Relocate.
1. Adjust or replace.
1. Adjust conditions.
1. See chart "4.[1] Condensate
pump not operating."