Ariston 104 Fault Code (Cares ONE NG)

Safety disclaimer

Fault code summary

Manufacturer

Ariston

Fault code

104

Fault type

Circulation, Pump

Severity

lockout

Reset

The manual describes 104 as an operation-shutdown code; reset only after the cause is addressed and do not exceed five resets in 15 minutes.

Applicable models

Ariston Cares ONE NG

Quick answer

Insufficient circulation.

What does this fault code mean?

Insufficient circulation.

Common causes

• Insufficient circulation.

Symptoms

• The display shows the 104 shutdown code.

What can the homeowner safely check?

• Record the code and contact the installer if it persists.

Boiler reset information

The manual describes 104 as an operation-shutdown code; reset only after the cause is addressed and do not exceed 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 pump operation and primary circulation.

Applicable boiler models

• Ariston Cares ONE NG

Related fault codes

• 101 — Cares ONE NG

  Overheating.

  Read fault code
• 103 — 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: Insufficient circulation — 1 03, 1 04, 1 05, 1 06, 1 07.

Last verified

2026-09-12

Frequently asked questions