What this usually is
A code or a dead panel on a Criterion dryer usually names a sensor or a thermal device rather than a failed board. Thermal cut-outs open because the machine overheated, and the board reports that honestly; replacing the board without clearing the airflow fault buys nothing. What follows is arranged by likelihood rather than by how interesting each cause is.
What this looks like from the outside
- The panel is dark but the drum light still works — Partial power, which points at a connector or a board supply rather than the socket. That single observation eliminates more of the list than any amount of guessing.
- Buttons need pressing twice, or the wrong one responds — Membrane wear, which happens gradually and always on the most-used keys first. The value is in eliminating, not confirming; most of these come back negative and that is useful.
- The machine starts and stops repeatedly — A thermal device cycling: it opens on heat, cools, closes again, and the cycle restarts. Keep an eye on whether it is getting worse, because the rate of change is itself evidence.
- NEAR MISS: nothing at all happens when you press start — That is a supply or door-switch question rather than a control fault, and it has its own page. It takes less time than reading about it.
Likely causes, ordered
- A moisture or temperature sensor reading wrongly — Second because a coated or drifting sensor produces cycles that end early or run long, which owners report as a control problem. It sits above the more dramatic explanations because it is the one you are statistically likelier to have.
- A worn membrane or touch panel — Mechanical wear on the keys used most, which presents as intermittent response rather than as a dead machine. Compare it with how the machine behaved a month ago rather than with how you expect it to behave.
- An unstable supply or a shared circuit under load — A board that browns out resets, and a reset looks exactly like a logic fault from the front of the machine. The rank is a starting point, not a verdict; what you observe outranks it.
- A failed main control board — Last, because every cause above it produces the same display and only this one is expensive to get wrong. That single observation eliminates more of the list than any amount of guessing.
How to narrow it down
- Power the machine down at the breaker and restore it — A cold start clears a latched state. Note the result even if it is negative, because a ruled-out cause is progress.
- Press each key in turn and note which respond — A dead region or a neighbour responding instead points at the membrane rather than the board. The rank is a starting point, not a verdict; what you observe outranks it.
- Run the machine on a timed programme instead of sensor dry — If a timed cycle behaves and a sensor cycle does not, the sensor is the fault and the board is fine. Do it with the machine in its normal state rather than after you have already changed something.
What an owner can safely check
- Clean the lint filter, the housing and the vent duct — Do this before judging any code, because a thermal trip will come straight back if the air path is still restricted. Do it with the machine empty rather than mid-load.
Tools: vacuum, brushAbout 30 min
- Wipe the moisture sensor bars clean — A cloth with a little white vinegar removes the softener film that makes sensor programmes end early. The value is in eliminating, not confirming; most of these come back negative and that is useful.
Tools: cloth, white vinegarAbout 10 min
- Dry and clean the console face — Work around the key edges where steam gets in. Never spray anything directly at a control panel. Leave the machine a few minutes afterwards before you decide it has not helped.
Tools: clothAbout 10 min
- Stop at this point: what follows needs a meter on a live circuit — The remaining causes cannot be told apart by looking, which is why the page stops here.
Before you open anything
Safety
Power off first. Everything else on this page assumes you have done it. The power being off is not the same as the machine being safe to touch immediately. A laundry cabinet is top heavy with the front panel off, so do not tip or walk it on your own. Work with the door mechanism intact rather than around it.
When this becomes a service call
What separates half an hour of your time from a service visit: if the answer is cleaning or a power cycle, do it; if it needs a meter across a thermal device, call somebody. Past that point, a wrong guess is expensive rather than merely annoying. Call straight away if you smell scorching, see browning around a terminal, or find lint packed against a heat source.
Nearest pages of this class
What this page does not cover
One page cannot be both general and exact, and this one is general by design.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
