Exact model
Dux 300DHA20P
Fault-code coverage and official support for this exact registered model.
Evidence-led introduction
About this exact model
The mapping review separates Dux 300DHA20P from the covered 300DHC25 model because the official evidence identifies a different or ambiguous controller generation.
Evidence: Official model evidence
The CER register lists Dux 300DHA20P as current, with eligibility recorded from 17 November 2022 to 31 December 2030; this dated status is separate from the controller evidence used for fault-code compatibility.
Evidence: CER ASHP item 118
Model record
Current register listing
Registry source: CER ASHP item 118.
Source-checked facts
Model specifications
Blank or ambiguous specifications are left out. Each value below points to its register record or captured manual page.
| Specification | Value | Source |
|---|---|---|
| CER listing status | Current | CER ASHP item 118 |
| CER eligible from | 17 November 2022 | CER ASHP item 118 |
| CER eligible to | 31 December 2030 | CER ASHP item 118 |
| Zone 1 certificates | 25 STCs | CER ASHP item 118 |
| Zone 2 certificates | 24 STCs | CER ASHP item 118 |
| Zone 3 certificates | 29 STCs | CER ASHP item 118 |
| Zone 4 certificates | 31 STCs | CER ASHP item 118 |
| Zone 5 certificates | 31 STCs | CER ASHP item 118 |
Manual review: Captured manuals for this sourced brand do not explicitly cover this exact registry model, so no specification was transferred from a sibling.
Real equipment references
Owner-submitted photos and installer references
Automated privacy moderation approved these equipment-only photos for this exact model context. Installer contributions show their submitted credit; owner photos remain generic. They are identification references, not repair instructions.
Honest coverage status
No verified public codes for this model
Dux has source-verified codes for some models, but no public codeset is evidenced for 300DHA20P. Codes from another model may have different meanings.
Different or ambiguous controller generation
Dux’s official H4128 manual lists 300DHA20P under the earlier R134a Ecosmart range and documents a Dux Hot Water app controller, not the Smart Life controller used by the mapped DHC models.
Model mapping checked .
Nearest covered sibling model
These links are for comparison only; their codes are not assigned to this model.
Coverage checked .
Manufacturer route
Official support
Active support recorded
This brand is recorded as active in the Australian market.
Dux continues to publish current Australian Ecosmart heat-pump manuals with owner support and warranty routes.
Status checked · Research source
Ecosmart in a single-family dwelling: 7 years tank parts (3 years labour), 3 years refrigeration parts and labour, and 1 year other components parts and labour.