Intergas 1 Fault Code (Combi Compact HRE)

Safety disclaimer

Fault code summary

Manufacturer

Intergas

Fault code

1

Fault type

Overheating, Circulation

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

Temperature too high.

What does this fault code mean?

Temperature too high.

Common causes

• Air in the installation.
• Pump stuck or not running.
• Insufficient flow, closed radiators or isolation valves.

Symptoms

• The fault LED flashes and the main display shows 1.

What can the homeowner safely check?

• Check only the visible pressure and that user-accessible radiator controls are not all closed.

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 pump operation, air and primary circulation.

Applicable boiler models

• HRE 24/18
• HRE 28/24
• HRE 36/30
• HRE 36/40

Related fault codes

• 0 — Combi Compact HRE

  Sensor fault after self-check.

  Read fault code
• 0.0 — Combi Compact HRE

  Low pressure.

  Read fault code
• 10 — Combi Compact HRE

  Sensor fault S1.

  Read fault code
• 11 — Combi Compact HRE

  Sensor fault S1.

  Read fault code
• 12 — Combi Compact HRE

  Sensor fault S1.

  Read fault code
• 13 — Combi Compact HRE

  Sensor fault S1.

  Read fault code
• 14 — Combi Compact HRE

  Sensor fault S1.

  Read fault code
• 2 — Combi Compact HRE

  S1 and S2 interchanged.

  Read fault code

Manufacturer documentation

Section 11.1: Main display 1 — Temperature too high; air, pump and insufficient-flow causes are listed.

Last verified

2026-09-12

Frequently asked questions