E15
Tado
Control Logic or Zone Assignment Error
Smart thermostat shows E15 and the boiler runs continuously or not at all, ignoring setpoints.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Thermostat assigned to wrong zone in app, Multiple devices controlling same boiler relay, Misconfigured zone controller, Incorrect room linkage for Smart Radiator Thermostats
How to Fix / Troubleshooting
Safety first: This is a configuration issue; no need to open devices.
- Review zones in app: Open the Tado app and check each room’s settings. Ensure only one device is configured as the zone controller for the boiler relay.
- Check room assignments: Verify that each Smart Radiator Thermostat is assigned to the correct room and that rooms are linked to the correct heating zone.
- Avoid duplicate boiler calls: If you have multiple thermostats, ensure they are not all set to directly control the boiler relay unless your system is designed for that.
- Test single zone: Temporarily disable heating schedules in all but one room and test if the boiler responds correctly to that room’s setpoint.
- Re-run installation wizard: Use the Tado app installation wizard to re-assign devices and zone controllers according to your system layout.
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Repair Difficulty
Medium
3/5
Required Part
Tado Smart Thermostat Configuration (Zone Controller)
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