Skip to content
Heat Pump Fault Finder AU

Verified codeset result

The manufacturer documentation publishes fault code P28 for the All-In-One Pro controller display, mapped to the affected Emerald Energy models listed below.

Fault code P28

Emerald Energy All-In-One Pro controller display: P28

All-In-One Pro controller display

Emerald Energy logo (for identification)

Last verified from the captured official source review.

P28 meaning for this display codeset

This page isolates Emerald Energy fault code P28 for the All-In-One Pro controller display. It does not combine the Emerald Energy P28 meaning with another controller or codeset.

Before applying the Emerald Energy P28 meaning, confirm the affected model uses the All-In-One Pro controller display. In that controller namespace, P28 means documented as ipm overheat to lead system shutdown.

The Emerald Heat Pump All-In-One Pro Instructions source anchor on page 27 supports this Emerald Energy P28 record for the All-In-One Pro controller display.

The permanent source key emerald-all-in-one-pro-display P28 keeps the emerald-all-in-one-pro-display P28 controller/code pairing distinct in publication.

What the documentation says

Documented as IPM overheat to lead system shutdown.

This is a paraphrase of the manufacturer’s documentation. A licensed technician confirms the actual cause.

Severity

Red — urgent safety concern

Red means the documented fault involves safety-critical, leak, electrical, refrigerant, lockout or overheat language.

Repair, replacement and warranty context

Prioritise safety before the repair-or-replace decision

A red classification warrants urgent assessment by an appropriately licensed professional. The code alone cannot establish whether a component repair or full system replacement is proportionate.

This brand has a verified current Australian support route, so check warranty coverage with the manufacturer before authorising paid repair or replacement work.

Affected models

Every model mapped to this codeset is listed with the evidence match state used by this site.

Related codes from this codeset

These codes appear in the same documented controller or display codeset.

  • P22

    Documented as EEPROM alarm.

  • P25

    Documented as Temperature sensor failure to lead frequency limit.

  • P26

    Documented as AC under voltage alarm to lead frequency limit.

  • P29

    Documented as Compressor lack of phase.

  • P3

    Documented as Compressor over current.

  • P30

    Documented as Compressor overload.

Choose the right next step

Warranty or local repair?

Answer both questions. If the unit may be covered, we will direct you to the manufacturer first. Your answers stay in this page unless you submit a repair request.

Choose both answers to see the recommended route.

Official source

Where this result comes from

Emerald Energy. Emerald Heat Pump All-In-One Pro Instructions, PDF page 27. Retrieved .

Report a problem with this page