POS System Down? A Troubleshooting Guide for Cafes and Retail

It is Saturday morning, there is a queue to the door, and the point-of-sale terminal is showing a spinning wheel. Every minute of this costs you money and goodwill. This is a practical troubleshooting guide for cafes, restaurants, salons and retail stores — written to be usable by whoever is standing at the counter, not by an IT technician.

Before anything else: keep trading

Fix the revenue problem before the technology problem. Depending on your setup, your fallbacks are:

• Tether the terminal to a phone hotspot. Most modern POS tablets and payment terminals can connect to a mobile hotspot. If you have not tested this, test it on a quiet afternoon and write the steps on a card kept near the till.
• Switch the payment terminal to its own mobile connection. Many bank-supplied terminals have a SIM inside and can fall back to mobile if WiFi fails, but the setting has to be enabled.
• Use offline mode. Many POS platforms will keep taking orders offline and sync when the connection returns. Know whether yours does before you need it.
• Take payments another way. A payment link, a tap-to-pay app on a phone, or manual records reconciled later.

Then work the problem.

Step 1: Is it just you, or is it everything?

Check whether another device on the same network can reach the internet. Pick up a staff phone, disconnect it from mobile data, connect it to the shop WiFi, and open a website.

• Phone also fails: the problem is your internet or your network. Go to step 2.
• Phone works fine: the problem is the terminal or the POS service itself. Skip to step 4.

Step 2: Check the internet connection itself

Look at the modem or router. Most have status lights that tell you a lot at a glance. A steady internet or WAN light generally means the service is up. A flashing, red or absent light generally means it is not.

Do the following in order:

1. Check your provider's outage page or app. Do this before you start unplugging things. If there is a known outage in your suburb, everything else you try is wasted effort.
2. Power cycle properly. Turn the modem off at the wall, wait a full thirty seconds, turn it back on and wait two to three minutes for it to fully reconnect. Rushing this is why it "didn't work."
3. Check the cables. The phone or fibre lead into the modem, and the ethernet leads out of it. Cleaners, deliveries and stock movement dislodge cables more often than you would think.

If the connection is genuinely down and it is not a known outage, log a fault with your provider immediately — the clock on their response starts when you report it, not when it broke.

Step 3: If the internet is up but the network is flaky

Common in busy venues. The connection is fine, but the WiFi in the shop is struggling.

• Is the terminal too far from the access point? Metal counters, fridges, brick walls and glass display cases all block signal badly. A terminal that worked last month might be failing now because the shelving got moved.
• Is the guest network competing with you? If customers are on the same WiFi as your POS, a busy Saturday can starve your till of bandwidth. Your point-of-sale devices should be on a separate network from customer WiFi — for performance and for security.
• Has something new been plugged in? A new camera system, a digital menu board, or a staff member streaming music can change the picture.
• Is a microwave running? Genuinely. Microwave ovens interfere with 2.4 GHz WiFi, and in a cafe that means dropouts at predictable times of day.

Step 4: If it's the terminal or the POS software

1. Restart the POS device. A full restart, not just closing the app.
2. Check the POS provider's status page. Cloud POS platforms have outages. Check their status page or social media before assuming it is your fault.
3. Check whether a payment processor issue is in play. Sometimes the POS is fine and the card processor is down. The symptom is orders working but payments declining or timing out.
4. Look for a pending update. A half-applied update is a classic cause of a system that worked yesterday and doesn't today.
5. Check the date and time on the device. A wrong system clock breaks secure connections and produces baffling errors.
6. Check storage. A tablet with a full storage drive fails in strange, inconsistent ways.

Step 5: If it's the hardware

Receipt printers, cash drawers, barcode scanners and card readers each fail in their own way.

• Printer not printing: check paper, check the roll is loaded the right way round, check the cable, check it is on the network if it is a network printer. A printer that prints a test page but not receipts is a software configuration issue, not a hardware one.
• Cash drawer not opening: usually triggered through the receipt printer, so a printer fault often presents as a drawer fault.
• Card reader not pairing: Bluetooth readers lose pairing after battery discharge. Charge fully, then re-pair.
• Scanner reading wrong: often a configuration setting rather than a fault. Scanning the setup barcode in the manual usually restores it.

Preventing the next one

Most POS outages are predictable and preventable. The measures that make the biggest difference:

• Separate networks. POS and payment devices on their own network, customers on guest WiFi, staff devices separate again. This is the single highest-value change and it also drastically reduces your security exposure.
• A UPS on the network gear. An uninterruptible power supply on the modem, router and switch keeps you trading through brief power interruptions — worth its price in a single South East Queensland storm season.
• 4G or 5G failover. A business router with a mobile SIM that takes over automatically when the fixed line drops. Cutover happens in seconds and staff often do not notice.
• Wired connections where possible. An ethernet cable to the main terminal removes an entire category of problem.
• A written fallback card at the counter. Three steps, in plain English, that any staff member can follow to keep taking payments. This is free and pays for itself the first time it is used.
• Test the fallback quarterly. An untested backup plan is a hope, not a plan.

When to stop troubleshooting and call someone

If you have restarted the modem, confirmed there is no provider outage, restarted the terminal and checked the POS status page — stop. Continuing to change settings under pressure usually makes the problem harder to diagnose and occasionally creates a second one.

Real IT Consulting provides POS and retail IT support across the Gold Coast, Brisbane, Logan and Pimpama, including network segmentation, failover setup and same-day onsite attendance where available. Remote support is $99 per hour and onsite is $149 per hour, with no hidden fees. Call 0489 940 359.