Hatco Imperial Series Installation And Operating Manual page 22

TROUBLESHOOTING GUIDE
WARNING
This unit must be serviced by qualified personnel only.
Service by unqualified personnel may lead to electric
shock or burn.
Symptom
The booster heater does not heat at
all or only delivers water at 49°-66°C
(120°- 150°F).
Water at dish machine is not at the
proper temperature.
Probable Cause
Unit may have been energized without water (dry
fired) causing the element(s) to burn out quickly.
Fuses may be blown or circuit breaker tripped.
Over-current fuses may be blown.
Temperature setting out of calibration or
inoperable.
Contactors do not pull in.
High limit switch may be tripped or defective.
Transformer not working properly.
Low water cutoff inoperable, contacts do not
close.
Gauge(s) not working properly.
Thermostat set too low.
Booster heater has more than 1524 mm (5 linear
feet) of water pipe to the dish machine, causing
the water to cool off inside the pipe.
ELECTRIC SHOCK HAZARD: Turn OFF power at fused
disconnect switch/circuit breaker and allow unit to
cool before performing any cleaning, adjustments, or
maintenance.
Replace the element(s).
Check for proper fuse sizing. Replace fuses. Check/
reset circuit breaker.
Check for shorted elements, bad fuse block or short
in wiring.
Temperature setting should be maximum of 88°C
(190°F).
Test for voltage at coils. If coils are open or shorted,
replace contactors.
Reset switch, refer to "High Temperature Limit
Safety Switch" in the MAINTENANCE section. If
switch continues to trip or cannot be reset contact
an Authorized Service Agent.
Check secondary voltage, it should be the same
as the control circuit voltage. If not, replace the
transformer.
Remove probe wire and touch it to the tank. If
contacts close, probe is fouled and must be cleaned
or replaced.
Relay on circuit board maybe defective. Jumper
terminals 6 and 7. If unit energizes, circuit board is
defective and should be replaced.
Check temperature of water with a thermometer
to be certain gauges are working correctly. If not,
replace gauge(s).
Adjust or recalibrate, refer to "Thermostat Adjustment"
in the MAINTENANCE section. If thermostat will not
recalibrate properly, replace it.
If located farther than 1524 mm (5 linear feet),
pipes should be wrapped in insulation, and/or a
recirculating system installed.
22
English
WARNING
Corrective Action
Form No. EBOOSTER_AAM-1017