Ariston 101 Fault Code (Cares ONE NG)

Safety disclaimer

Fault code summary

Manufacturer

Ariston

Fault code

101

Fault type

Overheating, Safety lockout

Severity

lockout

Reset

This is an operation-shutdown code; the manual says it may be reset with the reset button, with a maximum of five resets in 15 minutes.

Applicable models

Ariston Cares ONE NG

Quick answer

Overheating.

What does this fault code mean?

Overheating.

Common causes

• The manual identifies an overheating operation shutdown.

Symptoms

• The display shows Err/101 and operation shuts down.

What can the homeowner safely check?

• Record the code and allow the appliance to cool.

Boiler reset information

This is an operation-shutdown code; the manual says it may be reset with the reset button, with a maximum of five resets in 15 minutes.

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 primary temperature, circulation and safety controls.

Applicable boiler models

• Ariston Cares ONE NG

Related fault codes

• 103 — Cares ONE NG

  Insufficient circulation.

  Read fault code
• 104 — Cares ONE NG

  Insufficient circulation.

  Read fault code
• 105 — Cares ONE NG

  Insufficient circulation.

  Read fault code
• 106 — Cares ONE NG

  Insufficient circulation.

  Read fault code
• 107 — Cares ONE NG

  Insufficient circulation.

  Read fault code
• 108 — Cares ONE NG

  Insufficient water; filling is requested.

  Read fault code
• 305 — Cares ONE NG

  PCB error.

  Read fault code
• 307 — Cares ONE NG

  PCB error.

  Read fault code

Manufacturer documentation

Operation shutdown error table: Overheating — 1 01.

Last verified

2026-09-12

Frequently asked questions