Intergas 27 Fault Code (Combi Compact HRE)

Safety disclaimer

Fault code summary

Manufacturer

Intergas

Fault code

27

Fault type

Temperature sensor, Electrical

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

Short circuit on the outside sensor.

What does this fault code mean?

Short circuit on the outside sensor.

Common causes

• Outside sensor short circuit.

Symptoms

• The fault LED flashes and the main display shows 27.

What can the homeowner safely check?

• Record the code and contact an authorised installer.

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

• Test the outside sensor and its wiring.

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
• 1 — Combi Compact HRE

  Temperature too high.

  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

Manufacturer documentation

Section 11.1: Main display 27 — Shortcut outside sensor; replace the outside sensor.

Last verified

2026-09-12

Frequently asked questions