What to do if my Warmup + Kit Thermostat 4iE displays 'er1 amb'?
- AAndrea SchaeferJul 27, 2025
If your Warmup Thermostat 4iE displays “er1 amb”, it means the system type is not correctly set. To resolve this, ensure that the system type is set to “Central Heating” during the initial setup. You can switch the Thermostat to air mode by navigating to settings, then heating preference, then control, and finally selecting air/floor.