BoilerFaultCodesThe 6 most common faults
01
Very fast pulses (4 per second) High Engineer
Your boiler has stopped working because it has detected an issue with water flow, internal temperature, or system pressure.
Full guide for Very fast pulses (4 per second)02
Faulty primary circuit High Engineer
Your boiler has detected that hot water is not circulating properly around your heating system, which is preventing it from staying operational.
Full guide for Faulty primary circuit03
Lack of burner ignition High Engineer
Your boiler is failing to light the flame needed to generate heat or hot water, so it has purposefully shut itself down to remain safe.
Full guide for Lack of burner ignition04
Excessive temperature on primary circuit Emergency Engineer
Your boiler has automatically shut down because the water inside it has become dangerously hot.
Full guide for Excessive temperature on primary circuit05
Ignition gas pressure adjustment Emergency Engineer
Your boiler has detected an issue with the gas supply pressure during the ignition process and has safely locked itself out to prevent unsafe operation.
Full guide for Ignition gas pressure adjustment06
Minimum gas pressure adjustment Emergency Engineer
Your boiler has detected that the incoming gas supply pressure is too low to operate safely and efficiently.
Full guide for Minimum gas pressure adjustmenton the Ideal Mini
NTC temperature sensorCirculating pumpAutomatic air ventCentral Heating PumpFlow SensorDiverter Valve
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