Most lists of why STC claims are rejected sort the reasons by type: serial, date, form, product. That is useful for diagnosis but unhelpful for prevention, because a type does not tell you who needs to change what they do. This article sorts the same failures by source: the crew on the roof, the office behind the claim, the customer who signs the paperwork, the supplier whose product is on the list, and the system design itself.
If you want the type-by-type reference, read top STC claim rejection reasons. If a rejection has already happened, use the 48-hour recovery plan. Here, the aim is to find the owner of each problem so the fix sticks.
Crew-caused rejections
The crew controls what exists on the day. Anything missing from the evidence set because a photo was not taken is a crew problem, and no amount of office diligence can recover it.
- Missing or unreadable photos. Labels shot in glare, serials out of frame.
- No location data. Phone settings off, or images forwarded through apps that strip metadata.
- Panel count mismatch. The array photo does not show every panel claimed.
- Undocumented attendance. No record of who was on site.
Owner and fix: the lead installer, with a printed checklist and a driveway review. See the solar installation photo checklist.
Office-caused rejections
The office controls what is entered and attached. These are data and consistency errors.
- Wrong installation type. New, additional or replacement chosen incorrectly.
- Date mismatches. Install date, certificate date and claim date disagree.
- Serial typos. One wrong digit between label and claim.
- Wrong zone or year. The STC count is built from the wrong postcode zone or deeming year.
- Capacity errors. Claimed kW does not equal panels multiplied by rating.
Owner and fix: whoever lodges, with a second-person check against the job record. The guide to installation type removes a common source of confusion.
Customer-caused rejections
The customer controls the identity and consent side. These look like paperwork errors, but they are often communication errors.
- Unsigned or incomplete assignment form.
- Name not matching the owner on other records.
- Wrong or abbreviated address.
- A signature dated before the install.
Owner and fix: the salesperson or installer who handed over the form. Complete it on site, check names against the electricity bill and read it back to the customer. The assignment form guide lists the fields.
Supplier and product rejections
Products come on and off the approved lists. A claim can be rejected because the model was not approved on the installation date, or the batch or variant claimed is not listed.
- Model off the list at install. Approval lapsed or was withdrawn.
- Variant not listed. The suffix on the model number matters.
- Serial not validating. The number does not match manufacturer data.
Owner and fix: purchasing. Check the current list when you order stock and again at the install date, and do not mix stock from different suppliers without checking.
System and eligibility rejections
Some rejections are about the installation itself, not the paperwork.
- Accreditation gap. The installer’s accreditation was not valid for the work.
- Attendance and supervision. The accredited person did not do or supervise the work as required.
- Standards non-compliance. Evidence suggests the system does not meet the relevant standards.
Owner and fix: the business owner. These are not clerical, and they can be hard to reverse. See installer attendance requirements.
A simple rejection ledger
Keep a spreadsheet with six columns: job number, date, rejection reason, source (crew, office, customer, supplier, system), days to fix and STC value held up. After a month you will see something like this:
| Source | Count | Avg days to fix | STC value held up |
|---|---|---|---|
| Crew | 9 | 11 | $15,300 |
| Office | 6 | 4 | $10,200 |
| Customer | 5 | 6 | $8,500 |
| Supplier | 1 | 14 | $1,700 |
| System | 0 |
On these numbers the crew is the biggest cost and the first priority. Without a ledger, the loudest problem usually gets the attention, which is rarely the largest. (The figures above are illustrative, using about $1,700 per 6.6 kW job.)
Why the sources matter to a buyer
A trader that pre-checks claims is effectively moving the catch point from the regulator to before lodgement. It does not change who causes the error, but it changes when you find out, which is the difference between a five-minute reshoot and a three-week delay. When you compare traders, ask what exactly is checked and by whom.
Patterns by business size
Solo and small crews tend to have crew-sourced and customer-sourced errors, because the same person does the sale, install and paperwork at the end of a long day. The cure is a short checklist and a pause before lodging.
Mid-size operations often have office-sourced errors, because information passes through several hands: sales, installers, schedulers and admin. Every handoff is a place where a date or serial can change. The cure is a single job record that everyone reads from, and a named person who signs off before lodgement.
Larger operations can see supplier and system errors, because products and accreditations are managed across many crews. The cure is a central product list with install-date checks and a register of who is accredited for what.
The cost of the same error repeated
A mistake that happens once is a lesson. The same mistake repeated is a process failure. Suppose a crew’s serial photos are poor on 1 job in 10, and the business does 40 jobs a month. That is four rejections monthly, about $6,800 of certificates delayed at a time (4 x $1,700), plus the office time to chase them. Cut the failure rate in half with a driveway review and you free up around $3,400 of cash every month, permanently. Rejections are not random bad luck, they are a rate you can move.
Fixing a pattern: an example
A regional installer found that nine of its fifteen rejections in a quarter were crew-sourced, and six of those involved panel serials that could not be read. The fix was inexpensive: a lens wipe at the start of each job, a rule to photograph labels before panels were lifted, and a driveway check against the list. Rejections dropped from fifteen to five the following quarter. The office did not work harder; the crew simply stopped creating the problem. Pattern fixes beat case-by-case rescue every time, because they remove the cause rather than the symptom.
What to do next
Use the STC compliance checklist to build the second-person check. Read the answer on why a claim was rejected for the short version, then the STC trading pillar and resources for forms and guides. If you want the check done for you, see how it works.