TROUBLESHOOTING
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.
SYMPTOM | PROBABLE CAUSE | CORRECTIVE ACTION | |
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Water reaches 180°F (82°C) | Low incoming water | Incoming water temperature must | |
but does not last through | temperature. | be adequate for booster size. Increase | |
the entire dishwasher |
| incoming water temperature. | |
operation. |
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Incoming water temperature | Primary water supply is not adequate | ||
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| drops. | to provide correct temperature in sufficient | |
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| quantities. Increase supply of primary | |
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| hot water. | |
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| Flow pressure is too high. | Higher pressure uses an excessive | |
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| quantity of hot water. Adjust flow pressure | |
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| to 20 psi (138 kPa). | |
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| Booster heater may | Booster heater must be properly sized | |
| be undersized. | for incoming water temperature and rinse | |
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| requirements of the dishwasher. | |
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| Incorrect voltage. | Check voltage on heater serial plate and | |
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| make sure supplied voltage matches. | |
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| A 240v booster heater operating on 208v | |
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| reduces wattage to 76% efficiency. | |
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The booster heater does not | Unit may have been | This will cause the elements to burn out | |
heat at all or only delivers | energized without water (dry | quickly. Replace the element(s). | |
water at | fired). |
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Fuses may be blown or circuit | Check for proper fuse sizing. Replace | ||
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| breaker tripped. | fuses. Check/reset circuit breaker. | |
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| Check for shorted elements, bad fuse | ||
| be blown. | block or short in wiring. | |
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| Temperature setting out | Temperature setting should be maximum | |
| of calibration or inoperable. | of 190°F (88°C). | |
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| Contactors do not pull in. | Test for voltage at coils. If coils are open | |
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| or shorted, replace contactors. | |
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| High limit switch may be | Reset switch. If switch continues to trip | |
| tripped or defective. | or cannot be reset contact an Authorized | |
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| Service Agent. | |
| Transformer not working | Check secondary voltage, it should | |
| properly. | be the same as the control circuit voltage. | |
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| If not, replace the transformer. | |
| Low water cutoff inoperable, | Remove probe wire and touch it to the tank. | |
| If contacts close, probe is fouled and must | ||
| contacts do not close. | ||
| be cleaned or replaced. Relay on circuit | ||
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| board maybe defective. Jumper terminals | |
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| 6 & 7. If unit energizes, circuit board | |
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| is defective and should be replaced. | |
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31 | Form No. |