The short answer
A Bosch WQG-series dryer that will not start usually has a reason that costs nothing to fix, and on this platform one of those reasons does not exist on a vented dryer at all: a ventless condensing dryer will refuse to begin with a full water tank. this is a later designation, and it reports more of its own state than the ones before it. The panel here can also be driven from an app, so a cycle can have been started or held from somewhere other than the machine.
What you observe
- It starts and stops within seconds — An interlock that closes and then opens again, most often the door.
- The panel is dark and nothing responds — A supply question before it is a machine question.
- The panel lights but the drum never turns — Something has been selected and then held.
- NEAR MISS - the drum turns but the cycle time never moves — That is a running machine with a display or a sensing problem rather than a no-start, and it belongs on the cycle-fault page.
Likeliest causes here
- Child lock, delayed start or a held programme — Each of these leaves a machine that is awake and idle, which is easy to read as broken. First, because on these models this designation carries more of these modes than the earlier ones.
- The door not latched — A door that looks shut and is not is the commonest no-start on any dryer, and this one is no exception. Second on these models: it takes two seconds and it is right more often than everything below it combined.
- The condensate tank full — A condensing machine with nowhere to put its water will not begin a cycle it cannot finish. Third on this family - thirty seconds to exclude.
- The lower access flap or the filter not seated — The machine checks that its own air path is closed before it runs. Ranked fourth on these models: it almost always follows maintenance, which is the clue.
- The supply - breaker, outlet or plug — A dark panel is a supply symptom far more often than a board failure. It comes last here - a standard household branch circuit is rated 15 A or 20 A, and both ends of it are worth checking.
- Where this ranking departs from the brand-generic page — The cause that moves is child lock, delayed start or a held programme. It leads on this family because this is the latest designation in its format, and it protects itself more readily than the ones before it. That is a property of the platform rather than of the brand, which is why the page above this one cannot rank it the same way.
Check in this order
- Hold the lock key down until the display changes — Clear any delayed start while you are there, and check nothing has been set from an app.
- Push the door until it latches, then push again — Look for a sleeve or a corner of a sheet caught in the seal, which holds it a hair off and defeats the catch.
- Pull the water tank out and empty it — Re-seat it properly. A tank that is back in the wrong position reads as a full one.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel - a capacitor can hold a charge after the power is off, and a machine that appears dead is no proof that it is. A dryer on a standard household branch circuit rated 15 A or 20 A that trips its breaker again after a reset is reporting a fault and must not be held in.
When to call
The door, the tank, the filter and flap, the panel lock-outs, the outlet and the breaker are all owner ground on these models, and they cover most no-start calls between them. The line is the door switch: a door that is definitely home and still ignored needs a meter on the switch and on the board supply.
Nearest pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
