What to do if E4 is flashing on my DEVI Floor Heating Systems display?
- RRichard FordJul 31, 2025
If the DEVI Floor Heating Systems thermostat displays 'E4' and is flashing, it means the thermostat has overheated and switched off as a safety measure. To resolve this, allow the thermostat to cool down for a while. After it has cooled, switch the thermostat off and then back on.