A silent dishwasher, a blank display, a button that doesn’t respond: this kind of failure can have a cause as simple as a door that isn’t latched… or as complex as a control module that needs replacing. Here’s how to tell the difference.

The most common causes

  • The control board (control module) : more than 1 case out of 3, the most frequent cause for this specific symptom. This failure happens noticeably more often on older appliances, whose electronic components have simply reached the end of their useful life.
  • The drain pump : about 1 case out of 4. Several models simply refuse to start a new cycle if they detect standing water from a previous cycle: it’s a built-in safety feature, not a power failure in itself. See our article on dishwashers that won’t drain.
  • The drain hose : about 1 case out of 12, for the same reason as above.
  • The wash motor: about 1 case out of 12, usually burned out or mechanically jammed.
  • The filter : about 1 case out of 16, but it’s often the simplest cause to fix, with a very high resolution rate on the first cleaning.

What you can check yourself

  • Check the power supply: the outlet, the breaker at the panel, and especially the door latch. Several models simply won’t start if the door isn’t fully closed and latched.
  • Check whether an error code is displayed: see our dedicated article to interpret the situation.
  • Clean the filter and check that the tub isn’t already full of standing water from a previous cycle. If needed, refer to our article on drainage problems.
  • Reset the appliance: cut the power for one to two minutes, then restore it.

When to call a repair technician

  • No sign of life at all (no light, no sound) even after checking the power supply: the cause is likely electronic or motor-related, which requires diagnosis with specialized equipment.
  • The appliance is more than 10 to 15 years old: at this point, the real question isn’t just “what’s broken,” but “is it worth repairing.” Quebec’s legal warranty for a reasonable duration doesn’t set a fixed number of years: it’s assessed case by case based on the price paid, usage, and contract terms, drawing on past rulings for this type of appliance. Beyond a certain age, replacing the appliance can be more worthwhile than repairing a control board. Our guide to choosing a new dishwasher can help compare your options.
  • The appliance is still relatively new: before paying for a repair, check your rights. Many appliances are covered by a legal warranty in Quebec, regardless of what the manufacturer’s warranty does or doesn’t cover. A new legal warranty of good working order will also come into effect on October 5, 2026 for new dishwashers, set at 5 years from delivery. These warranties are exercised with the seller or manufacturer; our article on the legal warranty explains how to assert them.

No sign of life on your appliance, or torn between repairing and replacing? Our technicians, trained on all brands, serve Laval, Montreal and the greater Quebec City region, with a one-year warranty on every repair performed. Submit a service request.

FAQ

How much does it cost to replace a control board?

The cost varies by brand and model. A technician can confirm the exact price for the part and labour during the diagnosis, before you commit to anything.

Should I repair or replace a dishwasher that’s more than 10 years old?

It depends on the repair cost compared to the price of a new appliance, and on the overall condition of the unit. A technician can give you an honest assessment before you decide.

In Summary

A dishwasher that won’t start isn’t necessarily at the end of its life: a door that isn’t latched or standing water from a previous cycle accounts for a good share of cases. But when the cause is electronic, especially on an aging appliance, it’s worth quickly assessing whether the repair is justified before investing time and money.