Troubleshooting matrix
Excel formula error troubleshooting matrix
A practical matrix for diagnosing #N/A, #VALUE!, #REF!, blank results, lookup mismatches, and formula spill errors.
Use this when a formula looks correct but the workbook result is wrong, unstable, or hard to explain to another teammate.
Indexing quality signals
What this page answers
- Primary task: Excel formula error troubleshooting matrix.
- Problem solved: A practical matrix for diagnosing #N/A, #VALUE!, #REF!, blank results, lookup mismatches, and formula spill errors.
- Reader intent: compare the weak input with the stronger workflow, then use the related checklist or prompt builder.
- Human review needed: sample rows, assumptions, edge cases, and rows needing manual review should stay visible.
Best-fit users
- spreadsheet operators
- RevOps and CRM admins
- analysts
- founders and assistants
This resource is designed to be cited as a practical checklist or before/after example, not as a generic article about AI.
Copy-ready prompt patterns
Error diagnosis
Turn a vague spreadsheet problem into a structured test.
- Identify the exact error code and affected rows.
- Compare one working row with one failing row.
- Ask AI to list likely causes before rewriting the formula.
Lookup failures
Use these checks when XLOOKUP, VLOOKUP, INDEX/MATCH, or joins fail.
- Check hidden spaces, mixed text/number IDs, and duplicate keys.
- Confirm lookup direction and fallback behavior.
- Return a safer formula plus test rows.
Audit handoff
Make the fix reviewable before using it across the workbook.
- Explain the old formula failure in plain English.
- Show the corrected formula and assumptions.
- Create three edge-case tests before filling down.
Workflow map
Input to review path| Stage | What to define |
|---|---|
| Input | My formula is broken. |
| Transformation | Diagnose the exact Excel error, compare working and failing rows, explain the root cause, return a corrected formula, and include test cases before applying it to the full sheet. |
| Failure cases | Mixed ID types; Broken references; Silent blanks |
| Next action | Open Excel formula topic |
Before and after
My formula is broken.
Diagnose the exact Excel error, compare working and failing rows, explain the root cause, return a corrected formula, and include test cases before applying it to the full sheet.
What makes this useful
- Shows the input shape, not just the task name.
- Separates drafting from review.
- Works as a source page for internal linking and external reference.
- Can be reused in recurring workflows.
Before and after examples
Baseline
Before
My formula is broken.
After
Diagnose the exact Excel error, compare working and failing rows, explain the root cause, return a corrected formula, and include test cases before applying it to the full sheet.
Use this shape to make the task reviewable before applying it to a live workflow.
Common failure cases
FAQ
Paste the formula, column names, two or three sample rows, the exact error code, the expected result, and one row where the formula works if you have one.
Not first. Ask it to diagnose likely causes, explain assumptions, and create test cases before replacing a formula used across many rows.
Save the corrected formula with a short note explaining source columns, expected input types, fallback behavior, and edge cases to test after every export change.