BoilerFaultCodesThe 6 most common faults
01
0.0 High DIY-safe
Your boiler has lost the correct water pressure needed to run, or it can no longer accurately read how much water is inside the system.
What to try first
Locate the filling loop (a silver flexi-hose) underneath the boiler.Open the valves on the loop to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valves tightly and check for any leaks.
02
10 High Engineer
Your boiler has detected an issue with one of its internal temperature sensors, which means it has safely shut down to prevent incorrect operation.
Full guide for 1003
11 High Engineer
Your boiler has stopped working because it is unable to accurately read the temperature of the water inside it, likely due to a faulty sensor connection or component.
Full guide for 1104
12 High Engineer
Your boiler has detected an incorrect reading from its internal temperature sensor, meaning it has shut down to prevent potential overheating.
Full guide for 1205
13 High Engineer
Your boiler has detected an issue with one of its internal temperature sensors, preventing it from safely heating your water.
Full guide for 1306
14 High Engineer
Your boiler's temperature sensor is providing an incorrect signal, so it has shut down as a precaution to prevent overheating.
Full guide for 14on the Intergas Rapid
Water pressure sensorPressure transducerFlow temperature sensorWiring harnessFlow temperature sensor (NTC)Flow NTC sensor
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 Intergas 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
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