Hoshizaki rh1-aac Manual Suplementar
18
III. Service Diagnosis
A. Diagnosis Chart
Problem
Possible Cause
Remedy
[1] Compressor will
not start—no
current draw.
current draw.
a) Power Supply
1. "OFF" position.
1. Move to "ON" position.
. Loose connection.
. Tighten.
3. Failure.
3. Call electrician.
b) Cord and Plug
1. Defective.
1. Replace.
c) Ground Fault Circuit
Interrupter
1. Tripped.
1. Check and reset.
. Defective.
. Replace.
d) Transformer
1. Open coil winding.
1. Check continuity and
replace.
e) Wiring to Control Module 1. Loose connection.
1. Tighten.
. Faulty.
. Check continuity and
replace.
f) High Pressure Switch
1. Bad contacts.
1. Check continuity and
replace.
g) Thermistor
1. Defective.
1. See "II.C. Thermistors."
Check and replace.
h) Control Module
1. Defective.
1. Replace control module.
i) Compressor Overload
1. Defective (contacts
open).
1. Replace.
j) Compressor
1. Open windings.
1. Check continuity and
replace.
k) Compressor Relay
1. Bad contacts.
1. Replace.
. Open coil winding.
. Check and replace.
[] Compressor will
not run—draws
current and trips
on overload.
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.
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.
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.
will not start.
a) Thermistor
1. Defective.
1. See "II.C. Thermistors."
Check and replace.
b) Compressor Relay
1. Defective.
1. Check and replace.
c) Control Module
1. Defective.
1. Replace.