Why Your Dr. Pen A11 Isn't Needling: 8 Reasons the Needles Aren't Penetrating (and the Fix for Each)

The short answer

Most reports of a Dr. Pen A11 that "isn't needling" come down to four things, and none of them is a failed motor: the head is seated but not locked, the head fitted is a nano head with no needles in it, the depth is still on a serum-absorption setting where nothing is meant to be felt, or the head has already been used. Work through those four before assuming the pen needs replacing.

If you want the order that resolves the largest number of cases fastest:

1. Seat the head and turn it until it clicks.
2. Confirm which head is fitted — count the pins, or note that it has none.
3. Confirm the depth on the gauge and the charge on the display.

Symptom, cause and fix at a glance

What you notice	What it usually is	What to do
The pen runs, and the head does not appear to touch the skin	The head is not locked into the connector	Reseat it and turn until it clicks into place
Nothing is felt at any depth setting	A nano head is fitted, which has no needles	Swap to a 12-pin, 18-pin, 36-pin or 42-pin head
Very little is felt, but the skin flushes normally afterwards	The depth is still in the serum-absorption band	Step the gauge up for that area and re-read the zone depths below
The second session felt weaker than the first	The head has already been used, or it is past its printed date	Open a new head and check both dates on it
The stroke sounds right but feels thin	The battery is low	Check the display for the flashing low-battery indicator, then charge on the base
The head skims across the surface instead of stamping	Too much product on the skin, or too much hand pressure	Thin the layer out and let the pen travel on its own weight

1. The head is seated but not locked

The A11 uses a 3-lock fixed cartridge connector. A head goes on and turns until it clicks; that click is the lock engaging, not a sound the plastic makes on the way past. A head that is pushed on but not turned will sit on the connector and run, and it will also lift fractionally under pressure — which reads on the skin as needles that are present but not arriving.

The counter-check is simple: if the head resists the connector rather than clicking into it, the problem is not seating. It is the wrong head. More on that in the last section.

2. The head has no needles in it

Nano heads — the Nano-R and Nano-S in this pen's range — have no needles. They press product into the surface rather than opening it, so no depth setting will make them puncture anything, because there is nothing in the head to puncture with.

This is the single most common cause of "the needles aren't penetrating" on a pen that is plainly working: the pen is fine, the technique is fine, and the head is doing exactly what a nano head is for. Count the pins on the head. If there are none, you have diagnosed it.

3. The depth is on a serum-absorption setting

The A11 gauge runs from 0 to 2.5 mm, and the bottom of that range is not meant to be felt. Work at 0.25–0.5 mm and you are in the band used for serum absorption and surface glow, where most people report little or no sensation. Feeling almost nothing at 0.25 mm is the setting doing its job.

Depth is also not one number for a whole face. The under-eye and the upper lip want the shallow end, the cheeks and jawline take more, and the forehead sits between the two. For at-home facial work, keep passes at or below 1.0 mm; the deeper end of the gauge is for trained practitioners. The per-concern numbers are set out in our needle depth guide.

4. Speed is being treated as depth

Speed changes the pace of the needle, not its depth. The A11 has six speed levels, and a higher level does not drive the needles further into the skin — it changes how smoothly the head travels and how the stroke feels. Raising the speed to compensate for a depth that was never set is one of the ways a session ends with nothing happening.

Depth comes off the gauge. Speed is what you tune for comfort and control: lower levels around the nose, mouth and under-eye, higher levels over the cheek and forehead, where the head has more room to move.

5. The battery is low, and the display is saying so

The A11 displays a flashing indicator when the battery is running low, and it runs wirelessly for up to 3–4 hours on a full charge, or wired on the 2-metre cord. If the indicator is flashing at the start of a session, charge it on the inductive base before judging anything about the stroke.

"It worked last time and feels different now" is a battery question more often than a pen question — the charge carries over between sessions rather than resetting.

6. The head has already been used

A cartridge head is single-use. A reused head does not cut clean channels; it drags, which is the opposite of what you want and it also changes how the whole session feels. An expired head is a different problem with the same outcome — it has been sitting on a shelf past its date.

Both dates are printed on the head itself, which makes them checkable before you ever open the pack. The full reasoning is in whether Dr. Pen cartridges can be reused.

7. There is too much product on the skin

A serum is meant to sit on the skin as a thin layer — enough for the head to move on, not enough to float it. Applied thickly, the head skims across the top of the liquid and the needles never reach the skin; applied too sparsely, the head drags. The layer is applied to each section as you work it, and reapplied wherever the skin starts to dry.

Hand pressure belongs in the same paragraph. The pen travels across the skin under its own weight; pressing it down flattens the head against the surface and lifts the needles out of contact. If you have been pressing to make it "work", releasing that pressure is the fix. The full protocol is in how to use a Dr. Pen at home.

8. The head belongs to a different pen system

The A11 shares its cartridge system with the Dr. Pen M8S and A8S, and a head from that family clicks straight on. A head made for another family will not lock, and forcing one is the usual way a connector gets damaged.

The heads for this pen are in two places: the US-warehouse cartridge listing and Dr. Pen M8S A8S A11 replacement cartridges. Which grid to choose for which area is covered in what the different Dr. Pen cartridges are for.

What is normal, and what is not

Normal after a session: flushing and warmth across the treated area, and a skin surface that feels tight for a few hours. Redness typically settles within 12–24 hours for shallow work, and can run longer after passes above 0.75 mm. Normal during a session: a light prickling, and a nose and upper lip that read as more sensitive than the cheeks.

Not normal: a head that rocks on the connector, a pen that stops mid-session, a display that flashes throughout, or discomfort that makes you stop. None of those are technique problems and none of them should be worked around. Skip treatment over active breakouts, broken or irritated skin, and speak to a clinician about any skin condition rather than treating it at home.

Frequently asked questions

Why can't I feel the needles at 0.25 mm?

Because at that depth there is very little to feel. The shallow band of the gauge is the setting used for serum absorption and surface glow, and the feedback most people get there is a light drag rather than a prickling sensation. If you want the sensation of needling, the depth, not the speed, is the setting to change.

Does the A11 need a special cartridge, or will any Dr. Pen head fit?

It needs a head from its own family. The A11 shares its cartridge system with the M8S and A8S, and heads from that family lock straight on. Heads made for other Dr. Pen models will not seat correctly, and forcing one risks the connector.

How do I know the cartridge is locked in properly?

The head turns into the connector and clicks. That click is the lock engaging. If the head spins freely, or rocks when you press lightly on one edge, it is not locked — reseat it before the session rather than after the first pass.

Does a higher speed setting make the needles go deeper?

No. Speed changes the pace of the needle and how the stroke feels, not how far it travels into the skin. Depth is set on the gauge. Raising the speed to chase a result usually produces a session that feels more vigorous without being any deeper.

Can I use a nano head if I want needling?

No — a nano head has no needles, so nothing punctures the surface at any setting. Nano work is for pressing product into the skin and for finishing a session lightly, and it is a useful head to keep for that. It is not a lighter version of a pinned head.

My A11 worked on the first session and felt different on the second — what changed?

Two things usually. The head, if the first one was reused rather than replaced, and the battery, since the charge carries over between sessions. Check the printed date on the head and the display for the low-battery indicator, then re-check the depth on the gauge.

Should I press harder if nothing seems to be happening?

No — pressure works against you here. Pressing flattens the head against the skin and lifts the needles out of contact, which is the opposite of the intended effect. Confirm the head, the depth and the charge first; the pen is designed to travel across the skin under its own weight.

How many times can I use the same cartridge?

Once. A head is single-use: the needles lose the edge they need to cut cleanly after the first pass, and a reused head drags instead of cutting. Both the manufacturing and expiry dates are printed on the head, which makes the pack checkable before the first session.

Where to check the rest

The pen itself, its controls and its included contents are set out on the Dr. Pen A11 Microneedling Pen page, and the A11 with a 20-piece cartridge pack is in Dr. Pen A11 with 20pcs Cartridges. If the head on your pen turns out not to be a genuine one, the checks are on our how to verify your Dr. Pen page.