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Heat Pump Fault Finder AU

Verified codeset result

The manufacturer documentation publishes fault code E78 for the All-In-One Select controller display, mapped to the affected Emerald Energy models listed below.

Fault code E78

Emerald Energy All-In-One Select controller display: E78

All-In-One Select controller display

Emerald Energy logo (for identification)

Last verified from the captured official source review.

E78 meaning for this display codeset

This page isolates Emerald Energy fault code E78 for the All-In-One Select controller display. It does not combine the Emerald Energy E78 meaning with another controller or codeset.

Before applying the Emerald Energy E78 meaning, confirm the affected model uses the All-In-One Select controller display. In that controller namespace, E78 means documented as power detection module communication failure.

The Emerald Heat Pump All-In-One Select Troubleshooting source anchor on page 22 supports this Emerald Energy E78 record for the All-In-One Select controller display.

The permanent source key emerald-all-in-one-select-display E78 keeps the emerald-all-in-one-select-display E78 controller/code pairing distinct in publication.

What the documentation says

Documented as Power detection module communication failure.

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

Severity

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Source-grounded diagnosis context

Documented causes

Repair, replacement and warranty context

Start with diagnosis, then compare repair and replacement

An amber classification usually calls for a diagnosis and repair quote, not automatic replacement. Compare parts availability, repair cost and system age only after the fault has been confirmed by an appropriately licensed professional.

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.

  • E21

    Documented as Ambient temperature sensor failure.

  • E27

    Documented as Legionella control temp sensor failure.

  • E29

    Documented as Gas suction temperature sensor failure.

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 Select Troubleshooting, PDF page 22. Retrieved .

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