When a Connected Diagnostic Device Gives an Error: What Labeling and Workflow Should Explain

By the Connected Diagnostics Evidence Team

By Connected Diagnostics Evidence Editorial Team

When a connected diagnostic device shows an error mid-task, it is almost always reporting a technical problem — a bad connection, low battery, or failed capture — not a medical finding about you. The device’s labeling and instructions should say which kind of message you’re seeing and what step to take next.

Connected diagnostic devices capture an image or reading and send it through an app, a cloud platform, or a clinician portal. This guide walks through what to check, in order, before you assume an error means anything about your health.

If you’re waiting on this device because of urgent symptoms — chest pain, difficulty breathing, sudden severe pain, or anything that feels like an emergency — do not wait on a device to confirm it. Contact local emergency services or go to an emergency department. A malfunctioning error message is never a reason to delay care.

Is a device error the same as a medical result?

No. Connected diagnostic devices generally produce two different kinds of messages, and they’re easy to confuse under stress:

• Operational errors mean the device could not finish its job — a poor connection, low battery, a positioning problem, a software timeout, or a failed image capture. These say nothing about your health. They mean “try again.”
• Result or output messages are what the device produces once a reading or image was successfully captured and processed — raw data, an image for a clinician to review, or in some devices a flagged value.

The device’s labeling should state, in plain terms, which category a given message falls into. If it doesn’t make that distinction clear, that’s a labeling gap worth raising when you contact the manufacturer.

What is device labeling required to cover?

In the United States, medical devices are regulated under the Federal Food, Drug, and Cosmetic Act, and labeling requirements are tied to how the device is classified. Devices fall into one of three risk-based classes, and higher-risk classes carry more regulatory control over labeling content and premarket review.

The FDA’s device-marketing guidance is clear that labeling must be prepared according to federal labeling regulations and included as part of what a manufacturer submits before a device can legally be sold. Labeling isn’t marketing copy — it’s a reviewed, regulated part of the product. That context is worth keeping in mind when you’re deciding how much weight to put on what a device’s on-screen message or included instructions say. (Our Editorial Policy explains how we handle sourcing for claims like this one.)

One caveat worth stating plainly: registering and listing a device with the FDA, on their own, do not mean the FDA has evaluated or approved that specific product’s claims. Classification and listing are administrative and regulatory steps, not an endorsement of accuracy.

Known vs. unknown when a device errors out

What’s generally known and verifiable:

• FDA regulates the sale of medical devices sold in the U.S. and reviews evidence of safety and effectiveness before approval or clearance for a given intended use.
• FDA does not rate, rank, or recommend specific devices, and does not tell healthcare providers what to do in their own practice.
• Device labeling is a regulated component of the product, not just user-facing copy — it must comply with federal labeling rules.
• There is a national reporting system (MedWatch) for device malfunctions, serious injuries, and deaths connected to a medical device.

What depends on the specific device and can’t be answered in general terms:

• Whether a particular error code means a failed capture, a connectivity issue, or something else — this is device-specific and belongs in that device’s instructions for use.
• Whether an error should be repeated immediately, repeated after a wait, or reported before trying again.
• Whether a given device’s “intended use” statement includes diagnostic decision-making at all, or only supports a clinician’s separate evaluation.

When the “unknown” column applies to your situation, the instructions for use that came with the specific device — not general guidance like this article — is the correct source.

What should I do when I don’t understand an error?

1. Re-read the exact wording of the error. Note whether it references the device itself (connection, battery, sensor) or a completed reading.
2. Check the instructions for use that came with the device. If you can’t find them, FDA’s home-use device guidance recommends contacting your healthcare provider, who may have a copy, or the manufacturer directly.
3. Confirm basic operating conditions. Power source, connectivity, and compatibility between the device and any paired app or account are common, non-clinical causes of errors.
4. Do not treat an unresolved error as a result. An incomplete or failed reading is not the same as a normal or abnormal finding — it’s an absence of a finding.
5. Contact the right party for the right problem. A technical malfunction goes to the manufacturer’s support line. A question about what a completed result means goes to your healthcare provider.

When and how should I report a malfunction?

If a device repeatedly fails, behaves unexpectedly, or you suspect it contributed to an injury, federal guidance recommends reporting it in more than one place: to your healthcare provider, to the device manufacturer, and to the FDA through the MedWatch program. MedWatch accepts reports by phone, fax, mail, or online, and is built for device-malfunction or adverse-event reporting — not troubleshooting help, which should go to the manufacturer first.

Keeping your own basic log — the date, the exact error text, and what you were doing when it occurred — makes any of these conversations faster and more useful.

Common questions

Does an error message mean my device found something wrong with me?

Not by itself. Most error messages describe a technical failure — connection, battery, positioning, or capture — that stopped the device before it could produce a result. An error is an absence of a finding, not a finding.

Who do I contact first: the manufacturer or my doctor?

Start with the manufacturer for a technical malfunction. Contact your healthcare provider if you have questions about what a completed, successful reading means for your health, or if you can’t locate the device’s instructions for use.

Does FDA approval mean a device’s error messages are accurate?

FDA reviews evidence of safety and effectiveness for a device’s intended use and requires labeling to meet federal regulations, but it does not rate or endorse individual products, and registration/listing alone isn’t an approval of specific claims. The device’s own labeling is still the primary source for what its messages mean.

Related reading on this site

For background on how consumer health imaging and connected devices work before you get to an error screen, see Start Here. For a look at how this publication sources and verifies the claims in guides like this one, see How We Research.

This article is educational information, not medical or technical support. It does not diagnose, interpret device output, or tell you whether a specific device malfunction is safe to ignore. For questions about a specific device, contact its manufacturer or your healthcare provider. See our full Medical Disclaimer. Connected Diagnostics Evidence is an independent editorial publication operating on the cellscope.com domain and is not affiliated with, and does not represent, the former CellScope company or its products.

Last updated: September 9, 2026.