ACS Miner Condition & Warranty Guide
Understand our inventory classification system including condition grades, service levels, and warranty coverage options
ACS Miner Condition & Warranty Guide
Listings show inventory type and coverage today. Inspection grades (thermal, corrosion, cosmetic, overall) will appear on listings as units are graded. Coverage windows are those on the listing and the Sales Order — they are not uniform across the marketplace.
How We Classify Our Inventory
Every miner we sell falls into one of four categories:
New
Factory-sealed units that have never been powered on or deployed. These come with the full manufacturer warranty (per manufacturer terms) and arrive in original packaging.
Used
Previously deployed miners sold in their current operational state. Used miners are graded on cosmetic condition (A through D) and may include DOA protection or be sold as-is. Some used units may be cleaned or have a service tier applied, but this is not required.
Refurbished
Previously deployed miners that our technicians have serviced, tested, and verified. Every refurbished unit requires a service tier (Refreshed or Certified) and includes a Limited Warranty per the listing's coverage terms. These are graded on both cosmetic condition and the service level performed.
For Parts
Non-functional or partially functional units we've determined aren't economical to repair. These are sold as-is with no warranty for buyers who want to harvest components or have the expertise to repair them. We list all known issues for transparency.
Inspection grades
ACS grades used and refurbished miners on three axes, then rolls them into an overall grade. These are good-faith inspection labels, not a warranty.
| Axis | What it measures | Scale |
|---|---|---|
| Thermal | Temperature history, hotspots, and heat dissipation. The strongest signal for long-term reliability. | A–F |
| Corrosion | Rust, oxidation, and moisture wear on boards and connectors. | A–D |
| Cosmetic | Scratches, dents, and housing condition. Appearance — limited impact on performance. | A–D |
| Overall | Combined floor of the axes above. | A–F |
| Grade | Label |
|---|---|
| A | Excellent |
| B | Good |
| C | Fair |
| D | Poor |
| F | Failing (thermal / overall only) |
A strong thermal grade matters more than a pretty chassis. A cosmetic C with a thermal A is usually the better miner.
Cosmetic Grades (Used & Refurbished)
How the miner looks on the outside:
| Grade | Label | What to Expect |
|---|---|---|
| A | Excellent | Looks nearly new. Minimal signs of use—maybe light dust residue but no scratches, dents, or discoloration. |
| B | Good | Light wear from normal use. Minor scratches or scuffs, possibly some dust staining. All labels intact and legible. |
| C | Fair | Clearly been working hard. Visible scratches, scuffs, minor dents, or staining. Fully functional despite the wear. |
| D | Worn | Significant cosmetic wear—noticeable scratches, dents, or discoloration. Structurally sound but won't win any beauty contests. |
Important: Cosmetic grade does not indicate performance. A Grade C Certified miner with new thermal paste and fans will often outperform a Grade A used miner that hasn't been serviced.
Service Tiers
What our technicians have done to service the miner:
| Tier | Name | Services Included |
|---|---|---|
| — | Cleaned | Compressed air cleaning throughout, visual inspection |
| Refreshed | Refreshed | Cleaned + new thermal paste applied to all hashboards + functional testing and burn-in |
| Certified | Certified Refurbished | Everything in Refreshed + all miner cooling fans replaced |
Optional Upgrade: PSU Fan Replacement
For Certified units, you may see "+ PSU" indicating that PSU cooling fans have also been replaced. This is an optional upgrade beyond the standard Certified service.
Service Requirements by Inventory Type
| Type | Service Tier |
|---|---|
| New | Not applicable |
| Used | Optional (Cleaned, Refreshed, or none) |
| Refurbished | Required (Refreshed or Certified) |
| For Parts | Not applicable |
Warranty & Coverage Options
What happens if something goes wrong:
| Coverage | Typical window | What's Covered |
|---|---|---|
| Manufacturer Warranty | Per manufacturer terms | Full factory warranty per manufacturer terms. Available on New units only. |
| Limited Warranty | Usually 30 or 90 days | Covers functional failures—dead hashboards, PSU failure, control board issues. Does not cover cosmetic damage, user error, or power surge damage. |
| DOA Protection | Usually 7 days | If the unit is dead on arrival (won't power on or hash), we'll replace it or issue credit. Does not cover underperformance or cosmetic issues. |
| None (As-Is) | — | All sales final. You assume all risk. Standard for For Parts inventory. |
Ask in the listing conversation if you want a longer limited plan than the lot shows. The Sales Order is the source of truth.
Reading a Listing
When you see a listing like "Refurb · B · Certified · Limited Warranty", here's what it means:
- Refurb — Serviced by ACS technicians
- B — Good cosmetic condition (light wear)
- Certified — Certified Refurbished service (cleaned, new thermal paste, new miner fans)
- Limited Warranty — Covered against functional failures per the listing's coverage terms
More Examples
| Badge | Meaning |
|---|---|
| New · Mfr Warranty | Factory-sealed with manufacturer warranty (per manufacturer terms) |
| Used · A | Excellent cosmetic condition, sold as-is |
| Used · B · Refreshed | Good cosmetics, thermal paste refresh, sold with coverage TBD |
| Refurb · C · Certified | Fair cosmetics, full Certified service, Limited Warranty per coverage terms |
| Refurb · A · Certified + PSU | Excellent cosmetics, full service including PSU fans |
| For Parts | Non-functional, sold as-is for components |
Quick Reference
| Type | Cosmetic Grade | Service Tier | Warranty |
|---|---|---|---|
| New | — | — | Manufacturer (per mfr terms) |
| Used | A / B / C / D | Optional (Refreshed) | None, DOA Protection, or Limited (per listing) |
| Refurbished | A / B / C / D | Required (Refreshed or Certified) | Limited (per listing coverage terms) |
| For Parts | — | — | None |
Questions?
Contact our sales team if you need help understanding which condition tier is right for your needs. We're happy to provide additional photos or details on any listing.