BoilerFaultCodesThe 6 most common faults
01
28 High DIY-safe
Your boiler has stopped heating because there isn't enough water circulating inside the system to operate safely.
What to try first
Locate the filling loop (usually a silver braided hose with one or two valves near the boiler)Open the valve(s) slowly to allow mains water into the systemWatch the pressure gauge on the front of the boiler until the needle reaches the green zone, typically between 1.0 and 1.5 barClose the valve(s) tightly and restart the boiler
02
01 High Engineer
Your boiler has tried to start up but failed to light the flame, so it has shut itself down to prevent any gas build-up.
Full guide for 0103
12 High Engineer
Your boiler has stopped providing heating because it cannot accurately measure the temperature of the water inside the system.
Full guide for 1204
04 High Engineer
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Full guide for 0405
30 High Engineer
Your boiler has detected that the exhaust gases are too hot, so it has safely shut down to prevent damage to the unit.
Full guide for 3006
31 High Engineer
Your boiler has stopped working because it cannot correctly detect the temperature of the water inside it, which prevents it from firing up safely.
Full guide for 31on the Ravenheat HE80 98S
Pressure relief valvePressure gaugeExpansion vesselIgnition electrodeGas valvePCB
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 Ravenheat 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