Verified codeset result
The manufacturer documentation publishes fault code A05 for the Commercial CHP020 and CHP040 controller display, mapped to the affected Rinnai models listed below.
Fault code A05
Rinnai Commercial CHP020 and CHP040 controller display: A05
Commercial CHP020 and CHP040 controller display
Last verified from the captured official source review.
A05 meaning for this display codeset
This page isolates Rinnai fault code A05 for the Commercial CHP020 and CHP040 controller display. It does not combine the Rinnai A05 meaning with another controller or codeset.
Before applying the Rinnai A05 meaning, confirm the affected model uses the Commercial CHP020 and CHP040 controller display. In that controller namespace, A05 means documented as a tank-water temperature probe failure.
The Rinnai Commercial CHP020 and CHP040 Heat Pump Error Codes source anchor on page 1 supports this Rinnai A05 record for the Commercial CHP020 and CHP040 controller display.
The permanent source key rinnai-commercial-chp020-chp040-display A05 keeps the rinnai-commercial-chp020-chp040-display A05 controller/code pairing distinct in publication.
What the documentation says
Documented as a tank-water temperature probe failure.
This is a paraphrase of the manufacturer’s documentation. A licensed technician confirms the actual cause.
Severity
Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.
Qualified service work
What a technician will check
A technician will check the tank sensor connection and test the sensor.
Source: Rinnai Commercial CHP020 and CHP040 Heat Pump Error Codes, PDF page 1
These are paraphrased technician-facing checks from the manual, not homeowner instructions.
Owner outcomes
What owners reported next
This aggregate appears after at least three structured reports for this exact codeset and code. Counts come from fixed choices only. Private notes are never shown here.
- Fixed
- Unit replaced
- Still unresolved
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.
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.
Start with the manufacturer
The unit is under warranty or its coverage is uncertain, so no local repair lead form is shown. Ask the manufacturer about warranty support and keep proof of purchase.
Manufacturer route
Official support
Active support recorded
This brand is recorded as active in the Australian market.
Rinnai Australia's current support library provides heat-pump error-code and service routes.
Status checked · Research source
Warranty varies by Enviroflo line: S 5.0kW split has 10 years cylinder parts and 5 years compressor parts; current A and AR/GR lines publish 7 years cylinder and 5 years refrigeration components, with 1 year other components.
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Official source
Where this result comes from
Rinnai Australia. Rinnai Commercial CHP020 and CHP040 Heat Pump Error Codes, PDF page 1. Retrieved .