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Form No. EBOOSTERM-0406
31
TROUBLESHOOTING
Water reaches 180°F (82°C)
but does not last through
the entire dishwasher
operation.
Low incoming water
temperature.
Incoming water temperature
drops.
Flow pressure is too high.
Booster heater may
be undersized.
Incorrect voltage.
Unit may have been
energized without water (dry
fired).
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.
Incoming water temperature must
be adequate for booster size. Increase
incoming water temperature.
Primary water supply is not adequate
to provide correct temperature in sufficient
quantities. Increase supply of primary
hot water.
Higher pressure uses an excessive
quantity of hot water. Adjust flow pressure
to 20 psi (138 kPa).
Booster heater must be properly sized
for incoming water temperature and rinse
requirements of the dishwasher.
Check voltage on heater serial plate and
make sure supplied voltage matches.
A 240v booster heater operating on 208v
reduces wattage to 76% efficiency.
This will cause the elements to burn out
quickly. 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 190°F (88°C).
Test for voltage at coils. If coils are open
or shorted, replace contactors.
Reset switch. 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 & 7. If unit energizes, circuit board
is defective and should be replaced.
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
The booster heater does not
heat at all or only delivers
water at 120°-150°F
(49°-66°C).
WARNING
To avoid any injury or damage, the booster
heater must only be serviced by qualified
personnel.
WARNING
To avoid any injury or damage to the booster
heater turn the power OFF at the disconnect
switch/circuit breaker and allow to cool before
performing any maintenance.