BoilerFaultCodesThe 4 most common faults
01
Overheat High DIY-safe
Your boiler has become too hot and has automatically shut down to prevent damage or safety issues.
What to try first
Check that all radiator valves are open to ensure water can flow through the system.Wait for the boiler to cool down completely.Press the reset button once to see if the overheat light clears.
02
OVERHEAT NEON High DIY-safe
Your boiler has switched itself off because it has become too hot to operate safely.
What to try first
Ensure all radiator valves are fully openAllow the boiler to cool down for at least 30 minutesLocate the reset button on the control panel and press it firmly
03
WATER OVERHEAT THERMOSTAT High DIY-safe
Your boiler has switched itself off because it got too hot and needs a chance to cool down before it can restart safely.
What to try first
Check that all radiator valves are fully openAllow the boiler to cool down for at least 20 minutesPress the reset button on the front of the control panel
04
SUMP FAN FAILURE THERMOSTAT High Engineer
Your boiler has detected that a safety sensor near the fan or collection area has triggered because it has become too hot or has detected a block.
Full guide for SUMP FAN FAILURE THERMOSTATon the Ideal Turbo2 24
Overheat ThermostatCirculation PumpControl ThermostatCirculation pumpOverheat thermostatMain heat exchanger (flushing)
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Ideal shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue