E16
Tado
Boiler Firing or Safety Lockout Detected by Tado
Smart thermostat shows E16 and the boiler fails to fire when heat is requested.
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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
Boiler in lockout due to internal fault, Gas supply issue, Low system pressure, Tado relay calling for heat but boiler not responding
How to Fix / Troubleshooting
Safety warning: Gas and boiler internals must only be serviced by qualified professionals. You may safely reset the boiler and check basic indicators.
- Check boiler display: Look at the boiler’s own display for error codes or lockout indicators. Follow the manufacturer’s instructions to reset if allowed.
- System pressure: Verify that the boiler’s pressure gauge is within the recommended range (often 1.0–1.5 bar when cold). If low, top up using the filling loop as per the boiler manual.
- Gas supply: Ensure gas supply is available (other gas appliances working) and that any gas shutoff valves are open.
- Confirm Tado call for heat: In the app, set a high temperature and listen for the thermostat relay click. If the boiler still does not fire and shows its own error, the issue is likely with the boiler, not Tado.
- Contact a heating engineer: If the boiler repeatedly locks out or shows its own error codes, arrange professional service.
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Repair Difficulty
Hard
4/5
Required Part
Boiler (not Tado hardware)
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