When the Card Terminal Goes Down: The Outage Playbook Every Counter Needs

Card payments fail for boring reasons, and they fail at the worst moments: Saturday lunchtime, the Friday evening rush, the last hour of a market day. The amount it costs you is decided almost entirely by whether somebody has thought about it in advance. Most businesses have not. The terminal has worked for two years, so there is no plan — and twenty minutes of a queue dissolving is the result. Last updated: October 2026. First, work out which thing is broken There are four links in the chain, and they need different responses. Spend two minutes identifying which one before you start restarting things at random. The terminal itself. Frozen, won't power up, cracked reader. Only a spare device fixes this. The local connection. Wi-Fi down, router rebooted, a Bluetooth pairing lost. Very common and usually the fastest to fix. The internet line. Broadband out across the building — which you can confirm in seconds from a phone on Wi-Fi rather than mobile data. The acquirer or the card networks. Everything on your side is fine and authorisations are still failing. Nothing you do at the counter will fix it, and knowing that early stops you wasting ten minutes. The quick test that separates the last two: can another device on the same Wi-Fi reach the internet? If yes, your line is fine and the problem is upstream or in the terminal. The fallbacks, in order of how well they work A terminal on a different connection. This is the single most effective fallback, and it is why we recommend it to anyone whose takings depend on card. If the counter terminal runs on Wi-Fi and broadband, a second device on 4G is a genuinely independent path — a broadband outage simply does not touch it. Our 4G vs Wi-Fi connectivity guide covers the trade-offs, and a mobile terminal with its own SIM is the usual answer. Tap to Pay on a phone. If you already have a provider app set up on an Android phone, it uses the phone's mobile data and gets you taking contactless within a minute. It is contactless-only and capped, so it is a stopgap rather than a plan — see SoftPOS vs a card machine. The important part is having it installed and tested before the outage, not downloading it with a queue watching. Cash. Which only helps if you can give change — the practical argument for keeping a float and a drawer even in a mostly-card business. We went through that decision in do you still need a cash drawer. Offline or store-and-forward mode. Some terminals can take a transaction offline and forward it when the connection returns. Understand your own device's behaviour, and the risk: those transactions are not authorised at the time, so there is a chargeback exposure that scales with the value. Fine for a £4 coffee; think hard about it for a £900 sale. Taking details to charge later. Do not write card numbers down. If you need to invoice, take contact details and send a payment link afterwards. The three things to do before it happens again Put a card on the wall. Four lines: how to check if it is the Wi-Fi, who to ring, what the fallback is, what to say to the queue. The person on the counter when it happens is often not the person who knows. Test the fallback quarterly. An untested fallback is a theory. Run one transaction through the backup device every few months so you know the app still works, the SIM is still active and someone knows where it lives. Keep the backup charged. A spare terminal in a drawer with a dead battery is not a spare terminal. Fold it into your charging routine — our battery and charging strategy guide covers doing that across a fleet. What to say to the queue Worth deciding in advance, because the honest version loses fewer sales: tell people straight away that card is down, say what you can take, and offer the alternative immediately. Customers forgive an outage. They do not forgive standing in a queue for ten minutes before being told. The underlying point Resilience at a counter is not a bigger terminal. It is a second, independent path to taking money — ideally one that uses a different network than your primary — plus a cash float and a written plan. It costs very little and it only has to pay off once. If you want a second device on 4G as a proper fallback rather than a panic purchase, talk to us — we will match it to your current provider and setup. Trade pricing and UK support, and we answer the phone ourselves.