Hoshizaki HWR68A(-D) User Manual

4

[1] Compressor will 

not start—no  
current draw.

a) Power Supply

1. "OFF" position.

1. Move to "ON" position.

. Loose connection(s). . Tighten or reconnect.
3. Failure.

3. Call electrician.

b) Cord and Plug

1. Defective.

1. Replace.

c) Circuit Breaker 

(kitchen)

1. Tripped.

1. Check and reset. Call 

electrician if breaker trips 
repeatedly.

. Defective.

. Call electrician.

d) Transformer

1. Open coil winding.

1. Check continuity and replace.

e) Wiring to Control Board 1. Loose connection(s). 1. Tighten.

. Faulty.

. Check continuity and replace.

f) Voltage

1. Too low.

1. Call electrician.

. Too high.

. Call electrician.

g) High Pressure Switch

1. Bad contacts.

1. Check continuity and replace.

. Has operated 5 or 

more times in one 
hour. (E4 should be 
displayed)

. Determine why pressure 

switch is activated.

h) Thermistor

1. Defective.

1. Check and replace.

i) Control Board

1. Defective.

1. Replace control board.

j) Compressor Overload 1. Defective. (Contacts 

open)

1. Replace.

k) Compressor

1. Open windings.

1. Check continuity and replace.

l) Relay (Condensing 

Unit)

1. Bad contacts.

1. Replace.

. Open coil winding.

. Check and replace.

[] Compressor will 

not run—draws 
current and trips 
on overload.

a) Voltage

1. Too low.

1. Call electrician.

b) Start Relay

1. Bad contacts.

1. Replace.

. Open coil windings.

. Replace.

c) Compressor

1. Locked rotor.

1. Replace.

d) Start Capacitor

1. Defective.

1. Check and replace.

[3] Compressor runs 

intermittently and 
trips on overload.

a) Voltage

1. Too low.

1. Call electrician.

. Too high.

. Call electrician.

b) Condenser Filter

1. Clogged.

1. Clean filter.

c) Refrigerant Line or 

Component

1. Plugged or restricted. 1. Clean and replace drier. Clean 

and replace capillary tube heat 
exchanger assembly.

d) Condenser Fan Motor 1. Failed.

1. Replace.

e) Refrigerant

1. Overcharged.

1. Evacuate and recharge.

. Non-condensibles in 

system.

. Evacuate and recharge.

f) Location of Unit

1. Restricted air flow to 

condenser.

1. Move unit or increase 

ventilation.

[4] Cabinet  

temperature too 
high; compressor 
will not start.

a) Thermistor

1. Defective.

1. Check and replace.

b) Compressor Relay

1. Defective.

1. Check and replace.

c) Control Board

1. Defective.

1. Replace.