BoilerFaultCodesThe 6 most common faults
01
28 High DIY-safe
Your boiler has detected that there is not enough water pressure or flow to operate safely, which is preventing your heating and hot water from working.
What to try first
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the external filling loop to top up the system with water.Reset the boiler once the correct pressure is reached to see if the fault clears.
02
02 High DIY-safe
Your boiler has likely overheated or a safety sensor has detected an incorrect temperature, causing it to shut down for safety.
What to try first
Locate the reset button or control knob on the front panelPress and hold the reset button for five secondsCheck that your radiator valves are open and that the system pressure is between 1 and 1.5 bar
03
17 High Engineer
Your boiler has detected an electrical problem with the fan, which means it cannot safely clear away waste gases and will not start.
Full guide for 1704
12 High Engineer
Your boiler's internal thermometer that measures the temperature for your central heating has stopped working correctly, and your heating will likely fail to turn on as a result.
Full guide for 1205
04 High Engineer
Your boiler has switched itself off because it has reached an unsafe temperature, likely due to a circulation issue or a faulty internal safety switch.
Full guide for 0406
30 High Engineer
Your boiler has detected that the exhaust gases are too hot or the sensor monitoring them has failed, causing the system to shut down for safety.
Full guide for 30on the Ravenheat RSF 82 ET
Low water pressure switchCirculation pumpExpansion vessel rechargeOverheat ThermostatTemperature Sensor (NTC Thermistor)Circulation Pump
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