The short answer
A dryer that tumbles without drying is nearly always short of air rather than short of heat. On a compact cabinet the ranking below puts the lint path and the vent run first, because a restricted duct produces exactly this complaint and because a blocked vent is also the reason dryers cause fires.
What you observe
- The machine and the load are very hot but nothing dries — Heat is being made and not carried away, which is conclusive for a restriction.
- No warmth at all in the drum — Points at the heat source rather than the air path, and that side is mostly service work.
- NEAR MISS: the drum does not turn at all — That is a belt or motor fault and belongs on a different page.
Causes, most likely first on this appliance
- A lint screen that is not clear — A screen that looks clear can still be sealed by fabric-softener film, which blocks air without looking blocked. Ranked first on Danby: a compact dryer moves far less air and carries far less mass than a full-size one, so a restriction or a looseness a big machine would absorb stops a small one outright, and this line spans bar cabinets to apartment units, all of them designed to go where a full-size appliance would not.
- Half the supply is missing on an electric machine — An electric dryer needs both legs of its supply: with one leg lost, the drum turns and the heat does not. Ranked second: it ranks below the causes above because it costs more effort, not because it is rare.
- The duct is crushed behind the machine — A flexible duct squashed when the machine was pushed back to the wall. Ranked third: it sits here because it produces the same complaint as the cause above it and takes longer to confirm.
- The heating element or gas burner — On an electric machine the element opens and heat stops; on a gas machine the igniter or the valve fails. Ranked last: it is last because on an appliance this size the major components outlive everything around them, and replacing one often costs more than the appliance is worth.
Check in this order, and why
- Hold the screen up and pour water through it — Water that beads and sits rather than running straight through means the screen is sealed even though it looks clean.
- Note whether the machine runs normally but is simply cold — Normal tumbling with no heat at all is the signature, and it is an electrical rather than an appliance fault.
- Pull the machine forward and look at the duct behind it — A flattened elbow behind the machine explains a dryer that stopped working the day it was moved.
What an owner can safely check
- Wash the lint screen with hot water and a brush, then dry it — Scrub both faces with a little detergent, rinse until water runs straight through, dry it and refit it before running the machine.
Tools: soft brush, detergentAbout 15 min
- Pull the machine out and replace any crushed flexible duct with a smooth run — Leave the machine far enough from the wall that the duct is not squashed, and use the shortest, straightest run that reaches.
Tools: screwdriverAbout 45 min
- STOP HERE if the next step needs a meter on live terminals or a panel off — That is where an owner check ends and a service call begins.
Before you open anything
Safety
Unplug the machine or switch off its breaker before pulling the duct or reaching behind the machine, and keep it off while your hands are inside. On a gas dryer, shut the gas valve at the machine before disturbing anything, and if you smell gas at any point: do not switch anything on or off, leave the building, and call the gas utility or your emergency services number from outside. Do not look for the leak yourself.
When to call a technician
Call once the lint screen, the duct, the outside hood and the run behind the machine are all proven clear and the drum still tumbles cold, because what is left is the element, the igniter, a thermal device or the supply. Call an electrician instead if an electric machine tumbles normally with no heat at all, because a lost supply leg does exactly that.
Nearest pages of this class
What this page does not cover
This page covers the Danby dryer as a class, not one model or production run. Any family- or model-specific page for your unit takes precedence over it. Not here: element and thermal device part numbers, and the duct routing specified for your specific installation.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
