Common ATOL POS Errors: Diagnostics by Error Codes

The POS went offline in the middle of a shift, 1С shows "999", and the queue is growing — don't panic just yet: most of these failures can be resolved in 10–15 minutes if you troubleshoot step-by-step rather than changing the driver at random. We break down common error codes and symptoms of ATOL fiscal registrars (30F, 91F/92F, RETAIL family FRs) and the diagnostic procedure used by service engineers.

1. Summary table: code/symptom → cause → section#

2. Error 999 "No connection to cash register" from 1С and inventory management#

Check in order — the next step only makes sense if the previous one has been ruled out:

1. Cable and port. Replace the USB cable, connect directly to the motherboard port — passive hubs and front panel connectors most commonly cause disconnections under load.
2. Device Manager. The cash register is detected as a COM port without errors and has not duplicated after switching to another port.
3. DTO 8.x vs 10.x. Updated the driver, but the 1С processing module was written for a different product line — hence "999" mixed in with working receipts. Check with your configuration vendor for the required DTO version and align all components to the same product line.
4. COM emulation. The emulated DTO port number must match the port in the cash register connection settings in 1С.
5. Occupied port. Close any frozen driver test utility, second 1С instance, or services of other POS software.
6. Power supply. Voltage drops are a common cause of intermittent disconnections: the cash register is plugged into an extension cord alongside the terminal charger, the power supply unit is overheating, or the connector is loose. Test with the original power supply unit directly from a wall outlet.

3. Driver test — the main diagnostic tool#

First, separate "cash register ↔ Windows" from "Windows ↔ software":

1. Close 1С/inventory management software to free up the port.
2. In the DTO test utility, specify the port and baud rate, connect, and print a test document.
3. Connects and prints — hardware connections and driver are working properly; look for the cause in 1С: port, workplace settings, DTO version (§2, item 3).
4. Fails to connect even in the DTO test — the issue is below the 1С level: cable, port, power supply, driver (§2, items 1, 2, 6).

This is the first step for any "cash register is not responding" issue, not the last.

4. Error 235 "Storage Resource Exhausted" — Summary#

FN memory is full of documents not confirmed by the OFD:

1. Restore the communication channel — diagnostic steps in the article "Receipts are not being sent to the OFD".
2. Wait until the unsubmitted documents counter reaches zero.
3. Generate a "FN Closing Report" and replace the storage device — step-by-step in the article "Fiscal storage replacement".

This is a consequence of communication issues, not an independent POS failure.

5. "Paper Out" Error with Paper Loaded#

1. Compartment lid is clicked shut — the lid-closed sensor blocks printing even if paper is physically present.
2. Paper side: the thermal layer (the smooth, slightly shiny side) faces the print head. An inverted roll looks properly loaded, but won't print.
3. Paper sensor is clean of dust and scraps — a clogged sensor continuously triggers the "out of paper" status.
4. Paper width and type (57 or 80 mm) match the model specifications.

6. Error Closing a Shift on 91F/92F#

91F/92F are standalone fiscal recorders with a built-in battery for printing without external power. A depleted battery is a common reason for a Z-report cutting off halfway through or freezing specifically when closing a shift:

1. Before closing, especially after operating on battery power, connect an external power supply and wait 1–2 minutes before printing the Z-report.
2. If the error recurs even when connected to the mains, check the battery status via the service menu; the standard battery lifespan is 1.5–2 years, after which it must be replaced at an authorized service center.
3. If the shift closed incorrectly due to a power interruption during the Z-report, restoring and resending the report to the OFD is covered in the article on register shifts.

7. When and How to Update Firmware and DTO#

An update is required for specific requirements: FFD 1.2, permitted marking mode (online code verification via OSU/GIS MT), new types of marked goods. Firmware, DTO, and the 1С data processor work as a single chain; updating them individually is a direct path to error "999" from §2:

1. Close the shift and wait for all documents to be sent to the OFD.
2. Update the cash register firmware with the version from the manufacturer's website.
3. Update the DTO on all workstations to a version compatible with the new firmware.
4. Check with your 1С configuration provider if the data processor needs an update — and update it in the same run.

8. Example#

Coffee shop, ATOL 30F on 1С:Retail. Since lunchtime, the register was disconnecting with error "999" on every fifth receipt. The DTO driver test connected and printed stably — the issue was neither with the register nor with 1С. Cause: the cash register and payment terminal were powered from the same extension cord alongside a laptop charger. A dedicated power outlet and an original power supply resolved the issue completely.

9. How to do this in Cenaly#

• ATOL cash registers are connected via Cenaly Hardware Bridge; connection status and document queue are visible in the Hardware section.
• Right there — quick hardware checks (print, scan, weight) directly from the admin panel, without a service utility — the same principle as the DTO test from §3.
• If the printer fails, Cenaly POS continues accepting orders (electronic journal) — receipts will be printed after recovery, reconciliation is in POS → Receipts. In case of a prolonged breakdown, see correction receipt in case of cash register breakdown.

10. Where to Contact for Support and Warranty#

The forum.atol.ru forum is not supported. Current channels: Service Desk in the ATOL partner portal (partner.atol.ru) — if partner access is available; or the dealer/service center servicing the POS terminal — they have access to the Service Desk, escalations to the manufacturer, and warranty repair of the sealed unit.

11. Frequently Asked Questions#

Updated DTO, but 1С didn't react — what's wrong? The driver and the 1С processing module are different things. Check with your configuration vendor whether a separate updated processing module is required for the new driver version.

How to determine in a couple of minutes whether it's a POS or software issue? Driver test (§3): if it connects and prints in the DTO test, look for the issue in 1С; if it fails to connect there, the problem is in the cable, port, power supply, or driver.

91F/92F is draining faster — is this normal? No, it's a sign of battery wear. One to two years is the typical lifespan, followed by replacement at a service center; running continuously on mains power alone is not a solution, but a workaround.

Are Error 235 and "receipts not sending to OFD" the same issue? They are related, but not the same: 235 is a result of FN overflow due to unsent documents. You need to fix the connection to the OFD, not error 235 itself.

Related articles: receipts not sending to OFD · replacing the fiscal storage unit · Cenaly Hardware Bridge · correction receipt upon POS breakdown

This material is for informational purposes only and does not replace consultation with a service center or equipment manufacturer. Primary sources: technical documentation and ATOL Service Desk (partner.atol.ru), 54-FZ "On the Use of CCP", FTS methodological recommendations on the operation of CCP and FN (kkt-online.nalog.ru).