What E21 actually means
The dryer has spotted a problem with the heating side of things and stopped rather than carry on drying cold.
On Hoover condenser dryers, E21 is a heating fault. In practice it comes up when the heating circuit isn't behaving as the control board expects "" most often because the thermal cut-out on top of the heater has tripped after the machine overheated, or because the element itself has failed. On some models it is also flagged when water is sitting in the condenser area or isn't being moved to the reservoir, and on others it points at the heater control relay on the electronic module. The clothes come out damp and barely warm.
What usually causes it
- Overheating from clogged filters, which blows the thermal cut-out above the heater
- Failed heating element
- Water left in the condenser area or a condenser pump not clearing it to the tank
- Cycle interrupted repeatedly by opening the door, so the dryer never cools down
- Heater control relay on the electronic module gone faulty
What you can safely check yourself
Work through these in order. Anything beyond this — panels off, testing parts, anything to do with the wiring — is an engineer's job, and not one to attempt with the machine plugged in.
- Clean the door filter and any secondary fluff filter thoroughly "" this is the single most common root cause
- Unplug the dryer, take out the condenser, rinse the fluff off it and leave it to dry for half an hour before refitting
- Empty the water container and check it isn't cracked or leaking
- Clear fluff from the condenser housing and make sure the seal sits properly when you refit it
- Leave the machine unplugged for a minute, then power up and try a short cycle
- Let a cycle finish rather than opening the door partway through
When to call someone
This one usually needs an engineer once you have tried the checks above. We cover Nottinghamshire, Derbyshire and Leicestershire, and it's £66 including VAT for an engineer to come out and diagnose it — £84 in total if it's repaired on the visit with no parts needed. Any parts needed are quoted on site before we fit them — you decide. Every repair carries a 90-day workmanship guarantee.
Outside our area? The explanation above still stands — take it to a local engineer and tell them the code. Knowing it saves them time and you money.
Other Hoover tumble dryer codes
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- Hoover E10 — The dryer has stopped because it isn't sensing a normal load…
- Hoover E11 — The dryer has detected that it's getting too hot at the back…
- Hoover E14 — The dryer has lost a sensible reading from the temperature s…
- Hoover E15 — The dryer has stopped because the heating circuit isn't beha…