Hoshizaki SafeTemp FH1-AAC Service Manual page 19

Problem
[5] Cabinet temperature
too high.
[6] Cabinet temperature
display indicator does
not illuminate properly.
[7] Cabinet temperature
too low.
[8] Evaporator does
not defrost completely.
[9] Defrost cycle
lasts too long.
Possible Cause
a) Setpoint
b) Door
c) Defrost
d) Refrigerant
e) Fan Motor
f) Air Filter
g) Condenser
h) Thermistor
i) Control Module
a) Control Module
a) Thermistor
b) Compressor Relay
c) Control Module
a) Defrost Thermistor
b) Defrost
c) Defrost Heaters
(freezers only)
d) Safety Defrost
Thermostat
(freezers only)
a) Defrost Thermistor
b) Control Module.
c) Defrost
d) Defrost Heaters.
(freezers only)
e) Safety Defrost
Thermostat
(freezers only)
1. Incorrect.
1. Not sealing, or open for
long intervals.
1. Not enough defrosts
occurring per day.
Operation in humid
conditions.
1. Leak.
1. Defective.
1. Clogged.
1. Dirty.
1. Defective.
1. Defective.
1. Defective.
1. Defective.
1. Defective; contacts
welded.
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. 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.
19
Remedy
1. Correct setpoint. See
"II.B.1.b) Temperature
Setpoint."
1. Check for sealing, check for
door open at time of warm
cabinet temperature.
1. See "II.B.1.c) Defrost."
1. Repair leak and recharge.
1. Check and replace.
1. Clean.
1. Clean.
1. See "II.C. Thermistors."
Check and replace.
1. Replace.
1. Replace.
1. See "II.C. Thermistors."
Check and replace.
1. Replace.
1. Replace.
1. See "II.C. Thermistors."
Check and replace.
1. See "II.B.1.c) Defrost."
1. Replace heaters.
1. Replace safety defrost
thermostat.
1. Replace.
1. Replace.
1. See "II.B.1.c) Defrost."
1. Replace heaters.
1. Replace safety defrost
thermostat.