Intergas Rapid Fault codes & diagnostics

14 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural GasLPG 25-32 kW 2019-present
Download the Intergas Rapid manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 12 High 1 Low

All 14 documented codes

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0.0

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.

High DIY-safe £80-180

What to check first

  1. Locate the filling loop (a silver flexi-hose) underneath the boiler.
  2. Open the valves on the loop to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Close the valves tightly and check for any leaks.

Parts commonly replaced

  • Water pressure sensor
  • Pressure transducer
10

Your boiler has detected an issue with one of its internal temperature sensors, which means it has safely shut down to prevent incorrect operation.

High Engineer only £120-220

Parts commonly replaced

  • Flow temperature sensor
  • Wiring harness

Related codes

11

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.

High Engineer only £120-200

Parts commonly replaced

  • Flow temperature sensor (NTC)
  • Wiring harness

Related codes

12

Your boiler has detected an incorrect reading from its internal temperature sensor, meaning it has shut down to prevent potential overheating.

High Engineer only £120-220

Parts commonly replaced

  • Flow temperature sensor
  • Wiring harness

Related codes

13

Your boiler has detected an issue with one of its internal temperature sensors, preventing it from safely heating your water.

High Engineer only £120-220

Parts commonly replaced

  • Flow NTC sensor
  • Wiring harness

Related codes

14

Your boiler's temperature sensor is providing an incorrect signal, so it has shut down as a precaution to prevent overheating.

High Engineer only £120-220

Parts commonly replaced

  • Flow temperature sensor
  • Wiring harness

Related codes

20

Your boiler is struggling to read its own temperature levels because a sensor inside the unit is not sending the correct information.

High Engineer only £120-220

Parts commonly replaced

  • Flow temperature sensor
  • Wiring harness

Related codes

21

Your boiler has detected a communication error with an internal temperature sensor, causing it to shut down to prevent potential overheating.

High Engineer only £120-220

Parts commonly replaced

  • Flow/Return Temperature Sensor
  • Wiring Harness

Related codes

22

Your boiler has detected an issue with one of its internal temperature sensors, which means it has stopped working to prevent potential overheating.

High Engineer only £120-220

Parts commonly replaced

  • Flow temperature sensor (S2)
  • Wiring harness

Related codes

23

Your boiler's internal temperature probe is providing an incorrect reading, causing the system to stop operating to prevent damage.

High Engineer only £120-220

Parts commonly replaced

  • DHW Sensor
  • Wiring harness

Related codes

24

Your boiler has detected a faulty temperature sensor reading, which means it has safely shut down to prevent overheating or inefficient operation.

High Engineer only £120-200

Parts commonly replaced

  • Flow temperature sensor
  • Wiring harness

Related codes

27

Your boiler is receiving an incorrect signal from the weather sensor installed outside your home, so it is using a standard internal setting instead.

Low Engineer only £120-200

Parts commonly replaced

  • Outside air temperature sensor
29

Your boiler has detected an internal electrical fault linked to the safety mechanism that controls the gas supply, meaning it will not fire up to prevent any risk.

High Engineer only £180-300

Parts commonly replaced

  • Control PCB
  • Gas valve assembly

Related codes

30

Your boiler has detected an internal safety fault with the valve that controls the gas supply, meaning it has shut down to prevent unsafe operation.

Emergency Engineer only £200-350

Parts commonly replaced

  • Main PCB
  • Gas Valve assembly

Related codes

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