Electrolux Washer-Dryer Error Code 78: Machine Overheated
Error code 78 means one of the protection thermostats has opened due to overheating. The manual equates it to E 08 in Selecta II. Let the machine cool completely, clean the lint filter, and call us before using it again if it repeats.
High: a protection thermostat opened on overheating, so the machine must not be run until the cause is found.
- Code
- Error code 78, MACHINE OVERHEATED
- Equipment
- Industrial laundry
- Applies to
- Compass Control dryer program unit
What does Electrolux Professional error code 78 mean?
Heating equipment carries thermostats that open if temperatures go above a safe limit. They are the last line of defense against a fire in the cabinet. The dryer program unit watches them, and when one opens it shows ERROR 078 / MACHINE OVERHEATED. The manual does not say which thermostat tripped and sends the technician to E 08 in the Selecta II manual. The message is more serious than the sensor codes, because it reports a real over-temperature, or a thermostat that has opened for another reason. A clogged lint filter, a blocked exhaust or a heater that stays on too long are typical reasons for overheating in dryers, though the manual itself gives no list. After cooling, the thermostat can reclose and the machine may run again, which is why a repeat needs a proper check.
Affected models and control systems
This applies to the Compass Control washer-dryers WD4130 and WD4240, and the manual says the dryer codes apply only to these two. The code comes from the dryer program unit and corresponds to E 08 in the Selecta II manual.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Display shows ERROR 078 / MACHINE OVERHEATED
- Dryer stops and cabinet is hot
- Drying air has a hot smell
- Machine runs again after cooling and stops again
Possible causes
Likely causes — what usually sits behind error code 78 on this control. A technician confirms which one it is before any part is replaced.
- Lint filter or exhaust path blocked so the heat cannot leave
- Heater staying on because of a failed control
- Thermostat opening early from age
Safe checks before calling for service
- Stop the machine and let it cool completely before touching it.
- Clean the lint filter and check that the exhaust is free.
- Do not keep restarting if the cabinet is still hot.
- If it repeats, note how long the dryer ran before the stop and call us.
How a technician diagnoses error code 78
- Read the code and confirm it matches E 08 in the Selecta II manual.
- Follow the Service Manual for Selecta II for E 08.
- Identify which protection thermostat has opened.
- Check airflow, exhaust and heater control operation.
- Replace the thermostat or the failing control after the test.
- Thermostats are in the heating circuit on line voltage and are tested with the machine isolated.
- Finding why the machine overheated is a safety matter in heated equipment.
- Resetting or bypassing protection thermostats is not an operator task.
How error code 78 differs from similar codes
Code 78 covers any protection thermostat; codes 75 and 76 name the fan and drum motor switches.
Technical reference
- Maker documentation
- Electrolux Professional owner support
- Edition
- 438 9228-61/EN, 2011.08.25
- Models / control
- Compass Control dryer program unit
- Section
- Troubleshooting, printed p.138 (Error codes)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Electrolux Professional industrial laundry error codes
Is it a real overheat?
It may be. A protection thermostat opens when temperatures are above its limit.
Can I bypass the thermostat?
No. It protects the machine and the building from heat.
Why check the lint filter?
A blocked filter or exhaust is a common reason for overheating in dryers.
Need help with Electrolux Professional error code 78?
A technician confirms the cause on site and gives you the price in writing before any work starts.