The short answer
Start from the door not latching: on a Tappan dishwasher that is the likeliest explanation for what you are looking at, and a failed door switch, thermal fuse or control board is the least likely. Most of this you can settle before anyone is called.
What the symptom looks like
- The panel is dead and nothing lights up — No power reaching the machine, which is a supply question before it is an appliance one.
- It starts and then stops within a minute — That is a fill or a drain fault presenting as a start fault.
- NEAR MISS: it runs but holds water — Drainage, not starting.
Causes ranked for this brand, likeliest first
- The door not latching — The latch closes a switch as well as the door. A hair out of line and the machine never sees a closed door. It leads on Tappan: the door does switching work here, not just sealing, so its alignment is part of the electrical path.
- No power at the socket or the breaker — Dishwashers are often on a switched spur behind a cabinet, and that switch gets knocked without anyone noticing. Second, because the cord, the switch and the terminals are built to the lowest cost, so the supply side stays in play.
- The water supply shut off — Many machines wait silently for a fill that never comes rather than reporting it, so it reads as a start fault. Third, once the two above are clean: what arrives at the machine sets the ceiling on what the machine can do.
- A failed door switch, thermal fuse or control board — The door is closed and the machine still does not see it, or the board has lost its supply internally. Bottom of the list on purpose: the control decides what the machine does, so a control fault looks like a machine that has simply stopped caring.
Check in this order, and why
- Push the door firmly shut and listen for the latch — This is the most common finding by a wide margin.
- Check the breaker and any switched spur feeding the machine — A standard household branch circuit is 15 A or 20 A, and it trips for a reason.
- Check the supply tap under the sink is fully open — Taps get closed during other work and left that way.
What an owner can safely check
- Close the door firmly and listen for the latch, then check nothing on the top rack is holding it off — A single tall item is enough to stop the latch engaging.
About 5 min
- Check the breaker, and the switched spur if there is one, before anything else — If the breaker trips again immediately, stop and call: that is a fault, not a nuisance.
About 10 min
- Open the supply tap fully and check the fill hose is not kinked behind the machine — A part-open tap gives a slow fill and a machine that seems to hang.
About 10 min
- STOP HERE: testing a door switch or a thermal fuse means a meter on live terminals — A service call, not an owner check.
Read this before you start
Safety
Switch the machine off at its breaker or unplug it before removing the kick plate or any panel, and shut the supply off at the stop tap. A capacitor can hold a charge after the power is off. Never defeat the door latch to watch a cycle run: it holds hot water and a spray arm behind it. Water and a live terminal in the same cabinet is the one combination worth being careful about.
When to call a technician
Call when power is confirmed at the socket, the door latches properly, no lock or delay is set and the machine still does nothing. Call immediately and stop using it if the breaker trips as soon as you reset it: a circuit that trips on demand is reporting a fault, not being awkward.
Nearest pages of this class
What this page leaves to a more specific one
This page covers the Tappan dishwasher as a class, not one family or model line. Where a family-specific page exists it is linked below and it is the better answer. Not here: reset key sequences, switch part numbers and family-specific service modes.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
