Cash Drawer Will Not Open Automatically.
Find the Break in the Chain.
A cash drawer has no circuit board, no firmware and almost nothing to fail — yet it is one of the most common POS complaints. The fault is nearly always a locked key position, a driver setting or the trigger link. Here is the order that finds it.
The Drawer Opens Through the Printer
A cash drawer has no power supply of its own. It is driven by a short pulse sent through the printer. That single fact explains why a drawer fault so often starts as a printer fault.
A break anywhere along this chain produces the same result. Because most of the links sit inside the printer, the first question is not “is the drawer faulty” but “is the printer sending the pulse”.
Drawer never opens at all, even with the FEED button? That points at the drawer itself or the trigger link. If instead the printer is working normally and only the drawer fails, the cause is almost always a setting rather than hardware — see the companion guide linked at the foot of this page.
What Exactly Happens?
The behavior of the drawer narrows the cause quickly. Each row points at one layer.
| What you see | First check | Likely layer |
|---|---|---|
| Key opens it, never on a sale | The drawer-open setting in the driver | Software |
| Round key is turned to the locked position | The physical lock state | Physical |
| Nothing at all, even holding FEED for three seconds | The solenoid or the trigger cable | Hardware |
| Opens halfway, then returns | Weak solenoid supply or a stiff mechanism | Hardware |
| Drawer opens, then the printer stops responding | A shorted solenoid freezing the printer | Hardware |
| Opens from one till only, not another | Driver configuration on that station alone | Software |
| Clicking sound, but no movement | The solenoid fires but the mechanism is jammed | Hardware |
The Forced-Open Test
Most receipt printers can fire the drawer directly from the panel, without any transaction. This separates a drawer fault from a software fault in seconds.
Power on with paper loaded
The drawer pulse is generated by the printer mainboard, so the printer must be powered and idle rather than in an error state.
Hold the FEED button for two to three seconds
Press and keep holding FEED. On most models the printer feeds the paper and sends the drawer pulse at the same time. Release after the drawer opens.
Read the result
If the drawer opens, both the drawer and the trigger link are good, and the fault is a driver or software setting. If the button only feeds paper continuously and never fires the drawer, this model does not bind the kick pulse to FEED, and you should confirm the drawer by substitution instead.
Work Through the Layers in Order
The same six layers used across this series, read for a peripheral with no consumables.
Layer 1 — Power
The drawer has no independent supply; it draws from the printer trigger port. The correct question at this layer is therefore whether the printer itself is powered and out of an error state.
Layer 2 — Cable
Check the trigger cable first, since a loose or failing link is one of the most common causes. Substitute a known-good cable rather than inspecting the original, and confirm the connector is fully latched — the trigger port and a network port look similar but are not interchangeable. Confirm the trigger pin selection matches the driver setting, because a mismatch produces no response at all.
Layer 3 — Media, replaced by the mechanism
A drawer has no consumable, so the paper and mechanical layer does not apply in its usual form. The equivalent on-site check is the drawer itself: look along the slides and around the latch for debris, banknote fragments or foreign objects that prevent the tray from releasing. Clear them and work the latch by hand to confirm the mechanism moves freely.
Layer 4 — Driver
Open the printer driver properties and the device settings, then confirm an open-drawer option is enabled and that the pin it fires matches the wiring. Wording differs between drivers — you may see it as open drawer, cash drawer or kick-out — but the effect is the same. After a printer change, this option is very often left disabled on the new unit. If the setting is enabled and the drawer still does not fire, the next thing to check is the electrical pair rather than the software: the pinout and voltage behind the pulse covers which contact carries the drive and what each rating means.
Layer 5 — Software
The POS application usually holds its own drawer setting, independent of the driver. Confirm which payment types and actions are configured to fire the drawer, and check that the receipt template still contains the trigger command, since a template replaced during an update will silently stop firing it.
Layer 6 — Hardware
The solenoid coil can fail open or short, and a shorted coil can drag the printer mainboard down with it. The drawer body itself rarely fails: its springs, latch plate and coil are its main moving parts. Measure the coil with a meter to confirm, and treat a drawer that takes the printer down with it as a shorted coil rather than a printer fault.
⚠ Safety boundary. Never connect a cash drawer to any port other than the printer trigger port. Wiring a drawer to a powered USB or network port can short the solenoid and damage both devices. Confirm the connector is the trigger type and not a network connector before plugging anything in, and never force a connector that does not seat.
Repair or Replace
Most drawer faults are resolved with a cable, a setting or a clean. Replacement is justified by repeated failure or by a step up in duty.
✓ What you can do on site
- ✓Turn the key to the unlocked or online position
- ✓Substitute the trigger cable
- ✓Enable the open-drawer option in the driver
- ✓Confirm the driver trigger pin matches the wiring
- ✓Clear debris from the slides and latch
- ✓Work the latch by hand to test the mechanism
! When to contact service
- ·Printer trigger port damage
- ·Solenoid replacement, where the model allows it
- ·Printer mainboard replacement after a shorted coil
- ·A drawer that takes the printer down when it fires
When a replacement is the better answer. If a drawer has been repaired more than once and still fails, or if a high-traffic lane is running a light-duty drawer, moving to a heavy-duty model costs less over a year than repeated call-outs. The drawer is one of the few POS parts where the upgrade case is usually about duty cycle rather than about a single fault. If the drawer is fine but nothing comes out of the printer at all, work through POS printer not printing, or browse the full troubleshooting index.
Prevent the Next Stuck Drawer
Drawer faults are almost entirely about habits and settings rather than wear.
Do not slam the drawer
The latch plate is the part that wears. Coaching staff to close it firmly but not forcefully extends its life considerably.
Clear the slides
Banknote fragments along the slides are the most common mechanical cause. A wipe when the till is counted costs nothing.
Keep a spare trigger cable
It is the least expensive item on site and converts a suspected drawer failure into a one-minute test.
Re-check after a printer change
The open-drawer setting does not carry across to a new printer. Add it to the swap checklist.
Related Troubleshooting Guides
If the printer is working normally and only the drawer fails, the companion guide takes the shorter path.
POS Prints But Will Not Open the Drawer
The printer is fine and only the drawer fails — a setting, not a part.
POS Printer Not Printing
When the printer itself stops, the drawer stops with it, since it is driven through the same board.
Receipt Printer Printing Blank Paper
The printer runs but produces nothing — thermal paper and printhead checks.