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Heat Pump Fault Finder AU

Verified codeset result

The manufacturer documentation publishes fault code P03 for the Ecosmart Pro-Series controller display, mapped to the affected Dux models listed below.

Fault code P03

Dux Ecosmart Pro-Series controller display: P03

Ecosmart Pro-Series controller display

Dux logo (for identification)

Last verified from the captured official source review.

P03 meaning for this display codeset

This page isolates Dux fault code P03 for the Ecosmart Pro-Series controller display. It does not combine the Dux P03 meaning with another controller or codeset.

Before applying the Dux P03 meaning, confirm the affected model uses the Ecosmart Pro-Series controller display. In that controller namespace, P03 means documented as a discharge temperature sensor failure.

The Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C source anchor on page 40 supports this Dux P03 record for the Ecosmart Pro-Series controller display.

The permanent source key dux-ecosmart-pro-series-display P03 keeps the dux-ecosmart-pro-series-display P03 controller/code pairing distinct in publication.

What the documentation says

Documented as a discharge temperature sensor 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

Qualified service work

What a technician will check

These are paraphrased technician-facing checks from the manual, not homeowner instructions.

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.

  • E45

    Documented as discharge overheating three-times protection.

  • P01

    Documented as a bottom water temperature sensor failure.

  • P02

    Documented as a top tank water temperature sensor failure.

  • P04

    Documented as an ambient temperature sensor failure.

  • P05

    Documented as a coil temperature sensor failure.

  • P07

    Documented as a 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

Dux Manufacturing Limited. Dux Ecosmart Pro-Series Heat Pump Installation and Owner’s Manual, H4950 Revision C, PDF page 40. Retrieved .

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