The most expensive part of a dishwasher is the circulation wash motor and pump assembly, which runs $320 to $650 installed in Greater Boston. It is the component that pressurises the spray arms, and replacing it means pulling the machine out of the cabinet, disconnecting water and drain lines, and separating the sump from the tub. On integrated Bosch, Miele, and other European platforms the electronic control board is a close rival at $300 to $600, partly because the part itself is expensive and partly because those machines require proprietary diagnostics to confirm the fault before you commit to the board.
Both repairs land near half the cost of a mid-range replacement machine, which is exactly why they are the point where repair-versus-replace becomes a genuine decision rather than an obvious one.
Dishwasher Component Costs, Highest to Lowest
| Part | Installed cost (Greater Boston) | Why it costs what it does |
|---|---|---|
| Circulation wash motor and pump | $320 – $650 | Expensive part plus full machine extraction |
| Electronic control board | $300 – $600 | Almost entirely part cost; OEM only |
| Tub or liner damage | $400 – $800 | Rarely economical; usually ends the machine |
| Heating element (glued-in platforms) | $280 – $520 | On some tubs the element is not separable |
| Drain pump | $190 – $340 | The most common repair we attend |
| Water inlet valve | $180 – $310 | Accessible, inexpensive part |
| Door latch and switch assembly | $180 – $300 | Common on machines that will not start |
| Door gasket or seal | $170 – $290 | Wear item; prevents leak damage |
| Spray arm or diverter | $160 – $280 | Cheapest common fault |
| Rack, tines, or basket | $90 – $220 | Cosmetic and convenience parts |
Full itemized ranges across every appliance category are on our Boston repair pricing guide.
When the Expensive Repair Is Still the Right Call
A $600 circulation motor is not automatically a bad decision. It depends on what the machine is:
- A Miele or high-end Bosch under ten years old. These are rated for fifteen to twenty years and replacement runs $1,200 to $2,500. Repair comfortably wins.
- Any integrated or custom panel-ready unit. Replacement means matching cabinet dimensions and often a new custom panel, so the real replacement cost is well above the appliance price.
- A machine under five years old. Still early in life, and the rest of the components have years left.
It is the wrong call on a builder-grade plastic-tub machine past year nine, where a $500 repair buys you a year or two on an appliance that was never built to last.
How to Avoid the Expensive Failures
Both of the top two failures have a maintenance story behind them:
- Clean the bottom filter monthly. Debris that passes the filter reaches the circulation and drain pump impellers, and impeller damage is what turns a cheap repair into an expensive one.
- Descale quarterly. Boston water is hard, and scale on the heating element and in the pump housing shortens the life of both.
- Scrape, do not pre-rinse to spotless. Modern detergents need some soil to work against, but bones, seeds, and glass fragments are what kill pumps.
- Do not overload the bottom rack against the spray tower. Blocked flow raises pump load every cycle.
Service intervals are covered on how often do you service a dishwasher, and the foil trick that damages pumps is addressed on why put a ball of tinfoil in the dishwasher.
Get a Firm Number Before Deciding
Circulation motor and control board faults present similarly: the machine runs a cycle but dishes come out dirty, or the cycle aborts with an error. Only a diagnosis distinguishes them, and the difference matters because one is a $340 repair and the other can be $600.
Book through dishwasher repair and maintenance, or for Bosch and Miele platforms see Bosch and Miele specialist service. The full repair-versus-replace analysis is on is it worth it to repair a dishwasher.