Commercial Dishwasher Repair: Common Faults and Fixes
Commercial dishwasher repair usually comes down to one of five systems: heating, filling, draining, wash pressure or the controls. This guide explains what each fault looks like, what typically causes it and when to call a licensed technician.
Checks you can do safely before calling
- Check the isolator switch and the circuit breaker are on
- Check the water supply tap is fully open
- Clean the scrap trays and filters
- Remove and rinse the wash and rinse arms
- Check the detergent and rinse aid containers are not empty
- Write down any error code on the display
Do not remove panels or touch wiring. In Western Australia, electrical repairs must be carried out by a licensed electrician.
Repair or replace?
A repair makes sense when the fault is a single component and parts are still available, which covers most breakdowns. Replacement becomes worth considering when the machine fails repeatedly, parts are no longer supplied, or the repair cost approaches the price of a new unit.
Electeq repairs at component level, including control boards, and only recommends replacement when a repair would not be cost-effective.
Getting a commercial dishwasher repair in Perth
Electeq is a licensed electrical contractor (EC15007) based in Ashby that repairs undercounter, door-type, conveyor and flight-type dishwashers, glasswashers and pot washers across the Perth metro area. Same-day service is available for urgent breakdowns. Call 0448 865 399.
Commercial dishwasher repair fault finder
| What you see | Likely cause | Typical repair |
|---|---|---|
| Water not hot enough, or rinse not reaching temperature | Failed heating element, thermostat or contactor | Test the heating circuit and replace the failed part |
| Machine will not fill, or fills slowly | Inlet solenoid valve, water level sensor or blocked inlet filter | Clean the filter, then test and replace the valve or sensor |
| Water stays in the tank | Blocked drain or failed drain pump | Clear the blockage or replace the drain pump |
| Dishes come out dirty | Blocked wash arms, worn wash pump or a detergent dosing fault | Clear the jets, test pump output and check dosing |
| Trips the safety switch or breaker | Current leaking to earth from an element, motor or wet wiring | Insulation test each component to find the leak |
| Stops mid-cycle or shows an error code | Door interlock, sensor or control board fault | Read the code, test the inputs, then repair or replace the board |
Commercial dishwasher repair: common questions
Why is my commercial dishwasher not heating?
The usual causes are a failed heating element, a faulty thermostat or a worn contactor that no longer switches power to the element. A technician tests each part of the heating circuit to find which one has failed.
Why does my commercial dishwasher keep tripping the power?
A dishwasher that trips the safety switch usually has current leaking to earth, most often from a heating element, a pump motor or wiring that has become wet. It should be isolated and tested by a licensed electrician before it is used again.
How long does a commercial dishwasher repair take?
Many repairs are completed on the first visit because the technician carries diagnostic tools and commonly needed parts. If a part has to be ordered, the repair is finished on a return visit.
How much does a commercial dishwasher repair cost?
It depends on the fault, the parts required and the machine. Call Electeq on 0448 865 399 with the brand, model and symptoms to request a quote.
Can I repair a commercial dishwasher myself?
You can safely clean filters, wash arms and scrap trays and check the power and water supply. Anything involving electrical components must be done by a licensed electrician.
Related services
Checked the basics and it is still not working?
Call Electeq for a licensed technician anywhere in the Perth metro area.