Hoover tumble dryer E21 error code
What E21 means on a Hoover tumble dryer
Heating fault, often a thermal cut-out trip caused by a blocked condenser.
Meaning checked by NAC's engineers, 9 November 2026.
What our engineers say
On a Hoover tumble dryer, E21 means there is a heating fault. Often this is because a safety cut-out on the heater has tripped, and a blocked condenser is a usual reason for that. You may notice the dryer is not heating, or that the drum has stopped turning.
There is no settled ranking of causes yet, but engineers sometimes find the cut-out has simply tripped and needs resetting. Sometimes the condenser is clogged with fluff, perhaps never having been washed out, and sometimes air cannot flow freely because things have been stacked against the back of the dryer. Now and then the heater itself has failed an electrical safety test, or the drum will not turn because the motor and the water pump have worn out.
An engineer will usually test the heater and its cut-out, look over the condenser for blockages and check the motor and pump. Often the repair is to reset the cut-out, wash out the condenser and test the dryer through a cycle. Where a new heater, motor or pump is needed, it may have to be ordered and fitted at a second visit. Keeping the space around the dryer clear helps air flow around it.
Written by our engineers from NAC's own jobs.
Faults this code turns up with
What our engineers found and fixed for each, from NAC's own repair records.
What we fixed. We'll add what our engineers found, the parts they fitted and what customers typically paid once enough of these repairs are confirmed. How we work out our figures.
Before you check anything yourself
- Switch the tumble dryer off and unplug it, or turn it off at the isolator switch, before you touch anything. Our guide to safely isolating an appliance walks you through it.
- An error code tells you where to look, not that it's safe to take the tumble dryer apart. Don't remove panels or covers to get at the parts it points to: that's an engineer's job.
- If it involves the mains supply, sealed parts, or you're not confident at any point, stop and book a qualified engineer rather than risk injury or further damage.
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