A dishwasher that will not start is usually being blocked rather than broken, and the panel deliberately does not tell you which of the two it is. Read the code before the symptom, because on this machine it separates two different faults: E15 is a safety lockout: the base pan has water in it, so the machine refuses to start a cycle rather than pump more water into a leak [S1], and neither source behind this page publishes a per-code median — so no figure is claimed for the code itself. The complaint arrives as the dishwasher will not start, and the panel is either dead or lit with nothing happening, described as no lights on the panel at all, the start light blinks and nothing happens, it beeps but the cycle never begins, the machine worked yesterday and now it is dead or the buttons do nothing but the display is lit.
What a technician actually does
door latch not closing the safety switch [S1]
high likelihood moderate $200–$320 installed about 60 min
the start light blinks and nothing happens it beeps but the cycle never begins
The part of dishwasher design that surprises people, in the source's words: the door latch is a power switch, not a catch. Until the latch closes the safety switch, the controls receive no power and the panel behaves like a machine with a fault. That is why a dishwasher can be completely dead and need nothing more than a latch that is not quite closing - and why the same symptom follows a door that has dropped, a bent strike or a rack in backwards. If the latch is the fault, the source's price is a service call plus the part.
the sources price the latch as a completed job rather than a part: S2 puts a door latch or interlock at $200-320 installed, and its guide prices the latch among the cheap dishwasher repairs
failed thermal fuse protecting the control board [S1]
medium likelihood advanced $280–$500 installed about 75 min
no lights on the panel at all
The first of the two parts people jump to, and the one worth reading as a message rather than a fault: a thermal fuse is one-way, and it opens because something got hot. On a dishwasher the usual reason is a control board drawing too much or a cooling path blocked, so replacing the fuse alone is how the same repair gets paid for twice. The source's order is deliberate: blockers first, then the fuse, then the board.
neither source prices a dishwasher thermal fuse on its own; S2's installed range for the board-level repair is $280-500 and that is the band a fuse job falls inside
failed main control board [S2]
medium likelihood pro $280–$500 installed about 90 min
it beeps but the cycle never begins the buttons do nothing but the display is lit
The second part people jump to, and on the source's own numbers it is the one that turns a no-start call into a decision: at $280-500 installed it is most of the way to a quarter of a new machine. The tell that separates it from the latch is electrical - a panel that lights up, responds to some buttons and never starts a cycle - and the source's blunt warning applies to a phone quote for it, because a price given without seeing the machine usually means a board has been guessed at.
S2 prices a control board at $280-500 installed and notes premium European brands run higher; no part-only figure is published
Repair or replace?
Work down the blockers before pricing a part: the lock icon, sleep mode and delay start cost nothing, the latch is a service call, and a code that says water is in the base pan is a leak to fix rather than an electrical fault. After that the choice is the board, and past eight years old a board-level repair on a machine at the end of its ten-year line is where replacement starts to win - not because $280-500 is too much on its own, but because the next failure is already queued behind it. [S1]
- Typical completed repair: $280–$500 [S1]
- Comparable new unit: $600–$1,000 [S1]
- Plus install and haul-away: $150–$250 — about $750–1250 installed all in [S1]
- Planning life used for the decision: 10 years
- The break-even is not the part, it is the machine coming out from under a countertop: a $600-1,000 dishwasher plus $150-250 of installation and haul-away has to be beaten by a $280-500 repair plus the risk of a second fault. Under eight years old it is not close. Past ten, the same numbers point the other way.
S2's half-of-new-price rule and the ten-year line used across this site's dishwasher guides; a board-level repair at $280-500 against a $600-1,000 machine plus $150-250 to install and haul away is the comparison the decision actually turns on
Run your own quote through the calculator — the same half-of-new-price rule with your numbers.
Do this first (free)
control lock, delay start or sleep mode left on [S1]
high likelihood easy no part needed about 5 min
the buttons do nothing but the display is lit the start light blinks and nothing happens
The source's first fork: a dishwasher that will not start is usually being blocked, not broken, and this is the block people pay a visit to discover. A lit lock icon on the display means every button is disabled until the lock is released, and the panel deliberately does not tell you why. Sleep mode and delay start look the same from the outside. The source also passes on the detail its own manufacturer page buries: a lower dish rack fitted the wrong way round stops the door latching properly, and on many models a blinking start light after you press it means the control is waiting for the door rather than reporting a fault. Free.
closed water valve or a tripped GFCI on the branch circuit [S1]
high likelihood easy no part needed about 10 min
no lights on the panel at all the machine worked yesterday and now it is dead
The other free blocker, and the one behind a genuinely dark panel: a dishwasher on a ground-fault device that has tripped has no power at all, and a supply valve closed during plumbing work leaves a machine that lights up and then refuses to fill. The source puts settings and installation issues ahead of any failed component for exactly this reason. Check the outlet or the breaker for the machine, then the valve under the sink, before anything is ordered.
safety lockout after water reached the base pan [S1]
medium likelihood easy no part needed about 30 min
the buttons do nothing but the display is lit the machine worked yesterday and now it is dead E15
The third blocker, and the one that is doing its job rather than failing: the machine senses water in the base pan, locks the cycle out and displays a code rather than pumping more water into a leak. Clearing it means finding and fixing the leak first - S3 documents the same E15 condition on Bosch machines, where the switch in the base is a float that lifts when water collects. Drying the base and restarting clears the code; it does not fix the cause, and the machine will lock out again on the next cycle if the leak is still there.