The manufacturer approved a replacement part: who pays the installation costs?

The old job has generated another bill
A component fails after your project has finished, and the manufacturer agrees to supply a replacement part. Before assuming the old job's repair cost is covered, ask what that approval includes. Removal, access equipment, installation and testing may need separate clarification. Keep your obligations to the customer in view while checking the recovery position with the supplier or manufacturer.
Find the claim and the actual promise
Retain the product identifier, original supply documents, warranty wording and approval message. Identify who made the promise and which claim it concerns. A replacement dispatch notice may confirm a part is coming without addressing any other expense. Do not interpret a short statement that the claim is approved more broadly than the documents support.
Ask specifically about claim expenses
The ACCC explains that warranties against defects must address responsibility for claim expenses and how expenses can be claimed back. Ask your adviser how the relevant warranty and any other rights apply to this purchase. Do not assume the voluntary warranty is the only source of rights, or that the general guidance determines reimbursement of every cost your business incurs.
Source: ACCC: Warranties
Consider a hypothetical parts-only message
Imagine an old installation needing a replacement pump and several hours of specialist work. The manufacturer confirms dispatch of the pump, while the installer forecasts recovery of the entire repair bill. That forecast contains an unconfirmed assumption. Ask separately about labour, access and testing, supported by the proposed work and rates, rather than waiting until the bill has been incurred to discover the disagreement.
Clarify approval without neglecting the customer
Check whether the claim process requires an estimate, authorisation or particular supporting records. Preserve necessary evidence of the failed component and work performed. Do not delay urgent safety action or disregard customer obligations while negotiating reimbursement. If timing or responsibility is disputed, obtain appropriate technical and legal advice on what must happen now and what can be clarified alongside it.
Track the supported recovery separately
Give accounts the confirmed expense treatment and the records needed for the claim. Keep unresolved amounts distinct from approved reimbursement, and check any payment against the agreed items. The practical aim is to establish what the third party has authorised or is otherwise responsible for. An old project's replacement part should not become a mistaken assumption that every associated cash outlay has been recovered.