Verified boiler fault code

Intergas 4 Fault Code (Combi Compact HRE)

No flame signal.

Safety disclaimer

Boiler repair help from Aza & Sons Services

Fault code summary

Manufacturer
Intergas
Fault code
4
Fault type
Ignition, Flame failure, Gas supply
Severity
Not specified
Reset
After the fault is rectified, press the reset key on the operating panel.
Applicable models
HRE 24/18, HRE 28/24, HRE 36/30, HRE 36/40

Quick answer

No flame signal.

What does this fault code mean?

No flame signal.

Common causes

  • Gas isolation valve closed.
  • No gas at meter.
  • Incorrect ignition gap.
  • Faulty burner.
  • Earth fault.
  • Gas pressure too low or faulty governor.
  • Gas valve or ignition module not powered.
  • Boiler controller fault.

Symptoms

  • The fault LED flashes and the main display shows 4.

What can the homeowner safely check?

  • Check only whether other gas appliances are affected and do not work on gas parts.

Boiler reset information

After the fault is rectified, press the reset key on the operating panel.

When should I call an engineer?

Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.

Engineer diagnosis

  • Investigate gas supply, ignition, burner, flame detection, gas valve and PCB.

Applicable boiler models

Related fault codes

Manufacturer documentation

Combi Compact HRE Installation, service and user instructions

Section 11.1: Main display 4 — No flame signal; the table lists gas, ignition, burner, earth, valve and controller causes.

Last verified

2026-09-12

Frequently asked questions

What does Intergas 4 mean?

No flame signal.

Can I reset a Intergas 4 fault?

After the fault is rectified, press the reset key on the operating panel.