Diagnosis Chart - Hoshizaki HUR40A(-D) Service Manual

B. Diagnosis Chart
Problem
[1] Compressor will
not start—no
current draw.
[2] Compressor will
not run—draws
current and trips
on overload.
[3] Compressor runs
intermittently and
trips on overload.
[4] Cabinet
temperature too
high; compressor
will not start.
Possible Cause
a) Power Supply
b) Cord and Plug
c) Circuit Breaker
(kitchen)
d) Transformer
e) Wiring to Control Board 1. Loose connection(s).
f) Voltage
g) High Pressure Switch
h) Thermistor
i) Control Board
j) Compressor Overload
k) Compressor
l) Relay (Condensing
Unit)
a) Voltage
b) Start Relay
c) Compressor
d) Start Capacitor
a) Voltage
b) Condenser Filter
c) Refrigerant Line or
Component
d) Condenser Fan Motor
e) Refrigerant
f) Location of Unit
a) Thermistor
b) Compressor Relay
c) Control Board
1. "OFF" position.
2. Loose connection(s).
3. Failure.
1. Defective.
1. Tripped.
2. Defective.
1. Open coil winding.
2. Faulty.
1. Too low.
2. Too high.
1. Bad contacts.
2. Has operated 5 or
more times in one
hour. (E4 should be
displayed)
1. Defective.
1. Defective.
1. Defective. (Contacts
open)
1. Open windings.
1. Bad contacts.
2. Open coil winding.
1. Too low.
1. Bad contacts.
2. Open coil windings.
1. Locked rotor.
1. Defective.
1. Too low.
2. Too high.
1. Clogged.
1. Plugged or restricted. 1. Clean and replace drier. Clean
1. Failed.
1. Overcharged.
2. Non-condensibles in
system.
1. Restricted air flow to
condenser.
1. Defective.
1. Defective.
1. Defective.
42
Remedy
1. Move to "ON" position.
2. Tighten or reconnect.
3. Call electrician.
1. Replace.
1. Check and reset. Call
electrician if breaker trips
repeatedly.
2. Call electrician.
1. Check continuity and replace.
1. Tighten.
2. Check continuity and replace.
1. Call electrician.
2. Call electrician.
1. Check continuity and replace.
2. Determine why pressure
switch is activated.
1. Check and replace.
1. Replace control board.
1. Replace.
1. Check continuity and replace.
1. Replace.
2. Check and replace.
1. Call electrician.
1. Replace.
2. Replace.
1. Replace.
1. Check and replace.
1. Call electrician.
2. Call electrician.
1. Clean filter.
and replace capillary tube heat
exchanger assembly.
1. Replace.
1. Evacuate and recharge.
2. Evacuate and recharge.
1. Move unit or increase
ventilation.
1. Check and replace.
1. Check and replace.
1. Replace.