Alpha 06 Fault Code (E-Tec 28 and 33)

Safety disclaimer

Fault code summary

Manufacturer

Alpha

Fault code

06

Fault type

Hot water, Temperature sensor

Severity

Not specified

Reset

Not specified

Applicable models

E-Tec 28, E-Tec 33

Quick answer

DHW sensor fault.

What does this fault code mean?

DHW sensor fault.

Common causes

• Incorrect DHW sensor resistance value.
• DHW sensor wiring connection or sensor fault.

Symptoms

This information was not provided in the verified manufacturer source.

What can the homeowner safely check?

This information was not provided in the verified manufacturer source.

Boiler reset information

Reset information was not provided in the verified manufacturer source. Do not repeatedly reset an unresolved fault.

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

• Assess the DHW sensor and its wiring.

Applicable boiler models

• E-Tec 28
• E-Tec 33

Related fault codes

• 01 — E-Tec 28 and 33

  Ignition failure; flame not detected during the ignition sequence.

  Read fault code
• 02 — E-Tec 28 and 33

  Overheat boiler lockout.

  Read fault code
• 03 — E-Tec 28 and 33

  High flue temperature.

  Read fault code
• 04 — E-Tec 28 and 33

  Gas-valve electrical connection fault.

  Read fault code
• 05 — E-Tec 28 and 33

  CH flow sensor fault.

  Read fault code
• 08 — E-Tec 28 and 33

  Maximum number of resets reached (five).

  Read fault code
• 10 — E-Tec 28 and 33

  Primary system pressure low.

  Read fault code
• 16 — E-Tec 28 and 33

  Fan fault.

  Read fault code

Manufacturer documentation

06 | DHW sensor fault | DHW sensor resistance value is incorrect | DHW sensor wiring connection or sensor faulty

Last verified

2026-09-12

Frequently asked questions