JNR P4 Not Working? 10 Common Problems & Easy Fixes

• Khan Afridi

The JNR P4 Stellarc 100K is a powerful hybrid refillable & replaceable pod kit that promises up to 100,000 puffs from a single kit, thanks to its 64ml total e-liquid capacity, dual-flavour pods, auto-refill containers, 1.2Ω dual mesh coil and 1200mAh rechargeable battery.

But like any advanced vape device, things can sometimes go wrong:
no vapour, not charging, weak flavour, burnt hits, leaking, or strange LED errors.

This guide is written exactly for users searching JNR P4 not working, JNR P4 no vapour or JNR P4 problems. We’ll walk through 10 common issues and give you simple, step-by-step solutions – plus when to replace pods or the whole device.

How the JNR P4 Works (Before You Start Troubleshooting)

To fix your JNR P4 properly, you need a basic understanding of how this prefilled pod kit is built.

Core design and components

  • Pods: The JNR P4 uses 2ml replaceable pods. Each pod has a coil and chimney and is visible through the shell so you can see the liquid level.

  • Auto-refill containers: Behind each pod sits a larger 10ml refill container. You fill these using the included 10ml bottles, and the container automatically tops up the 2ml pod as you vape.

  • Total e-liquid: With 2 pods, 2 refill containers, plus 4 × 10ml bottles, the full kit offers up to 64ml of e-liquid.

  • Coil: Each pod uses a 1.2Ω dual mesh coil, which heats quickly and gives consistent MTL flavour.

  • Battery: A 1200mAh rechargeable battery powers the device, charged via a USB Type-C port.

  • Screen: An animated curved display shows battery level and sometimes puff or mode information.

  • Airflow & activation: The JNR P4 is draw-activated (inhale to fire) and has adjustable airflow so you can customise your draw from tighter to looser.

Why problems occur

Because the JNR P4 is a complex hybrid system, issues can come from:

  • The pods and coils (burnt, old, not seated properly)

  • The refill containers (empty, not feeding properly)

  • The battery or charging port

  • The airflow system and draw sensor

  • The internal electronics in rare cases

Now let’s go through each problem in detail.

1. JNR P4 Not Firing (No Vapour on Inhale)

You inhale… but nothing happens. No vapour, no sound, maybe a tiny LED flash or nothing at all. This is one of the most common JNR P4 issues.

Why this happens

  • The battery is completely flat and can’t power the coil.

  • The pod isn’t making proper contact with the device’s connectors.

  • The pod or 10ml container is empty, so there’s not enough liquid to vapourise.

  • The airflow sensor that detects your puff is blocked by dust, lint or liquid.

  • The coil inside the pod is burnt or dead after heavy use.

Step-by-step fixes

1. Check the pod and container

  • Remove the pod and hold it up to the light.

  • Is there still e-liquid in the 2ml pod?

  • Check the 10ml container behind it – if the container is empty, the pod will eventually run dry even if it looks slightly wet.

If both are empty or nearly empty, refill the container (if possible) or replace the pod.

2. Reinsert the pod

  • Take the pod out and look at the metal contacts at the bottom.

  • Gently wipe the contacts on the pod and inside the device with a dry tissue or cotton bud.

  • Push the pod back into the device until it feels secure and the magnets grip it firmly.

Poor contact can stop the device from firing even if everything else is fine.

3. Recharge the battery

  • Plug the device into a USB Type-C charger.

  • Make sure the screen lights up and shows a charging symbol or battery icon.

  • Charge until the battery icon shows a comfortable level.

If the battery is too low, the device may not fire at all.

4. Clear the airflow

  • Look at the mouthpiece and airflow slots.

  • If you see lint, dust or dried juice, gently clean them.

  • Condensation buildup can block the draw sensor, so cleaning helps the device detect your inhale.

5. Try a new pod

If you have two pods:

  • Test each pod in turn.

  • If one pod works and the other doesn’t, the non-working pod’s coil is likely dead or damaged.

When to replace the device

You may need to replace the whole JNR P4 if:

  • The device does not fire with any pod.

  • The screen stays off even after a proper charge.

  • There’s no sign of life (no lights, no vibration, no sound) and you’ve ruled out cable and pod issues.

2. JNR P4 Not Charging

If your JNR P4 isn’t charging, the entire system eventually becomes unusable, even if your pods and containers are full.

Common causes

  • Damaged USB-C cable or low-quality charger.

  • Weak USB power source, like an underpowered laptop or old plug.

  • Dust or fluff inside the Type-C port, preventing proper connection.

  • The battery has been deep-cycled too many times and is losing capacity.

  • Rarely, an internal fault on the charging circuit.

Step-by-step fixes

1. Check the charging cable & adapter

  • Try a different USB-C cable you know works with other devices.

  • Use a reliable wall adapter (1A–2A), not just a random USB port on a monitor or cheap plug.

2. Clean the charging port

  • Look into the Type-C port – do you see dust or lint?

  • Carefully use a dry cotton bud or soft brush to clear it.

  • Never use metal objects or liquids.

A blocked port may prevent the cable from making firm contact.

3. Confirm the screen shows a charging signal

  • When you plug in, the curved screen should light up.

  • You should see a battery icon or some charging animation.

  • If the screen stays completely blank, try another cable / plug to rule them out.

4. Try a different power source

  • Switch from a laptop USB to a proper wall plug.

  • Some low USB outputs don’t provide enough stable power.

5. Let the device cool down

If you’ve been chain vaping heavily, the internal temperature may be high.

  • Let the device rest for 20–30 minutes.

  • Then plug it in again and check for a charging symbol.

When to replace the device

  • No charging icon or screen activity with multiple cables and plugs.

  • The port looks physically damaged or wobbly.

  • The device only charges for a second and disconnects repeatedly, even with a clean port and good cable.

3. Weak Vapour or Muted Flavour

If your JNR P4 still fires but vapour feels thin and flavour is weak, it can be frustrating – especially when you know the kit is capable of strong performance.

Common causes

  • Battery is low, so the coil isn’t getting full power.

  • Pod coil is worn out and not vapourising liquid efficiently.

  • Auto-refill container is empty, so the pod is slowly drying.

  • Airflow is too open or blocked in some areas.

  • Chain vaping is causing the coil to run too hot and thin the flavour.

Step-by-step fixes

1. Check pod liquid levels

  • Look at the 2ml pod: if it’s low or has big gaps in the cotton, it may be drying out.

  • Check the 10ml container: if this is empty, refill it (if appropriate) or swap the pod.

2. Replace worn-out pods

Even with proper auto-refill, a coil has a lifespan. After heavy use, flavour naturally fades.

  • If your JNR P4 has had strong flavour for days and suddenly becomes dull, the coil is probably near the end.

  • Replacing the pod almost always restores flavour.

3. Slow down your puff rhythm

  • Take slower, longer, but gentle MTL puffs.

  • Leave a couple of seconds between draws.

  • This allows the wicking material to fully re-saturate with e-liquid.

4. Recharge the battery fully

  • Plug in and charge till the battery icon is high.

  • A low battery can make vapour output weaker, even if everything else is fine.

5. Clear and adjust airflow

  • Clean any moisture around the airflow slider and mouthpiece.

  • Try tightening airflow slightly for warmer, more concentrated vapour.

When to replace the pod

It’s time to change pods when:

  • Flavour remains weak or “washed out” after cleaning and charging.

  • You see dark or cloudy liquid and know the pod has been used heavily.

  • You’ve refilled containers several times on the same pod.

4. Burnt or Harsh Taste

Burnt hits are one of the most unpleasant vape experiences – and they’re a sign that your coil is not properly saturated or is already burnt out.

Why this happens

  • You’ve been vaping when pod and container are nearly empty.

  • The 10ml container isn’t refilled in time, so the pod dries out.

  • You’re chain vaping with little to no pause.

  • Your puffs are very long and harsh, pulling liquid away from the coil faster than it can be replaced.

  • The coil has reached the end of its life and the wick is scorched.

Step-by-step fixes

1. Check e-liquid levels

  • Make sure the 2ml pod isn’t dry.

  • Check the 10ml auto-refill container – if it’s empty, refill or replace.

Vaping with low liquid is the fastest way to burn a coil.

2. Replace burnt pods

  • If you’ve already taken several burnt-tasting hits, the cotton inside the pod is usually damaged permanently.

  • Even if you refill, the burnt flavour tends to linger.

  • Swap in a new pod for clean flavour.

3. Slow down your puffing style

  • Take shorter, gentler puffs.

  • Wait 2–4 seconds between draws.

  • This gives the wicking material time to draw in more liquid.

4. Switch flavours correctly

If one pod/flavour tastes burnt:

  • Switch to the other pod ONLY if you know it has fresh e-liquid and a healthy coil.

  • Don’t keep using a pod that clearly tastes burnt “just to finish it” — it won’t improve and will only taste worse.

5. Recharge the device

While burning is mainly a wicking issue, low power can sometimes make the coil behave oddly. A full battery helps stabilise the heating.

When to replace the pod

  • Every inhale tastes burnt or harsh, even after refilling the container.

  • You’ve used the pod for a long time and flavour has progressively worsened.

  • The cotton around the coil looks very dark or burned.

5. Leaking or Gurgling

Leaking and gurgling are usually related issues: leaking is e-liquid escaping where it shouldn’t, while gurgling is the sound of excess liquid in the chimney or coil.

Common causes

  • Condensation buildup from normal use.

  • Over-inhaling and pulling too much liquid into the coil chamber.

  • Device stored flat or upside down for long periods.

  • Small cracks or defects in the pod.

  • Overfilled containers causing pressure imbalances.

Step-by-step fixes

1. Clean the device thoroughly

  • Remove the pod.

  • Use a tissue to wipe:

    • Inside the pod bay

    • Metal contacts

    • Around the airflow slider

    • Any visible liquid on the outside of the pod

This resets the system by removing excess e-liquid.

2. Insert the pod securely

  • Push the pod fully into place until it feels firm.

  • A loose-fitting pod can cause poor sealing and leaking.

3. Adjust your puffing technique

  • Inhale gently and steadily, not sharply.

  • Strong suction can draw liquid up into the chimney faster than it can vapourise, causing gurgling.

4. Store the device upright

  • When possible, keep the JNR P4 standing upright.

  • Lying it down or upside down for hours can encourage seepage.

5. Replace the pod if needed

  • If you see cracks in the plastic or liquid is constantly dripping out even after you clean, the pod is likely faulty.

When to worry

  • Leaks are reaching the area behind the screen or inside the battery housing.

  • You feel hot liquid spitting into your mouth on almost every puff.

  • Leaking continues even after switching to a new pod and cleaning thoroughly.

6. Pod Not Detected / LED or Screen Errors

Sometimes the JNR P4 will refuse to fire and show a flashing LED or an on-screen error when it can’t detect the pod correctly.

What this usually means

  • The pod is not “seen” by the device because of connection problems.

  • The device thinks there is a short circuit or open circuit.

  • The pod may be damaged or non-compatible.

Common causes

  • Wet or dirty contacts

  • Pod not fully inserted

  • Bent or damaged connector pins

  • Internal chip error

  • Pod coil is shorted or broken

Step-by-step fixes

1. Remove & inspect the pod

  • Look for cracks, melted plastic, or heavy leaking.

  • If the pod looks badly damaged, do not reuse it.

2. Dry & clean the contacts

  • Use a dry tissue or cotton bud.

  • Clean the gold contacts on the pod and inside the device.

3. Reseat the pod until it clicks

  • Push firmly until it feels locked into place by the magnets.

  • Make sure it isn’t crooked or half-inserted.

4. Clear the airflow and sensor area

  • If the draw sensor is flooded with liquid, the device might misread signals.

  • Clean the mouthpiece, chimney and pod bay.

5. Recharge the battery

Sometimes low voltage can cause random errors; a full charge can help rule this out.

6. Deflood the pod if it’s gurgling

  • Remove the pod.

  • Blow gently through the mouthpiece into a tissue.

  • Wipe off any expelled liquid and reinsert.

7. Try a fresh pod

  • If a brand new pod works perfectly, the original pod was faulty.

When to replace the device

  • Every pod, including new ones, gives the same error or flashing pattern.

  • The device never fires at all, even after cleaning, reseating, and charging.

7. Auto-Firing or Device Heating Up

Auto-firing (the device firing without you drawing) is one of the most serious issues and should never be ignored.

Common causes

  • Stuck or oversensitive draw sensor.

  • Liquid has entered the sensor or chip area.

  • Internal short circuit due to damage or heavy leaking.

  • Defective control board.

Step-by-step fixes

1. Remove the pod immediately

  • This stops airflow and liquid supply to the coil.

  • Do not keep the pod in place while it’s auto-firing.

2. Wipe & inspect the device

  • Look inside the pod bay and around the screen for liquid.

  • If you see internal flooding, the electronics may be compromised.

3. Allow the JNR P4 to cool down

  • Place it on a flat, non-flammable surface.

  • Do not hold it in your hand or put it in your pocket while it’s hot.

4. Insert a fresh pod and test (optional, only if fully cool)

  • Once it’s completely cooled and dry, you can test with a new pod.

  • Take one short, gentle puff and see if the device behaves normally.

5. If it auto-fires without a pod → stop using it

  • If the device fires, glows or heats up even with no pod installed, the fault is inside the electronics.

  • The device is unsafe and should be replaced, not repaired by the average user.

Safety tip

Do not continue using or charging a device that has auto-fired or overheated. Faulty devices should be disposed of according to local guidelines.

8. Airflow Too Tight or Too Loose

The JNR P4 has adjustable airflow, but sometimes it can feel wrong: either too tight (hard to draw) or too airy (no throat hit).

Common causes

  • Dust or lint blocking airflow holes.

  • Condensation or liquid inside the mouthpiece or chimney.

  • Pod not fully seated.

  • Airflow slider moved accidentally.

Step-by-step fixes

  1. Check for blockages

    • Inspect the small airflow holes and clear any visible dust.

  2. Reinsert the pod

    • If the pod is slightly misaligned, the air path can be pinched.

  3. Clear condensation

    • Remove the pod and blow gently through the mouthpiece.

    • Wipe any liquid from the chimney and pod bay.

  4. Adjust puffing technique

    • For tighter airflow: slower, deliberate MTL draws.

    • For looser airflow: smooth, controlled pulls instead of sharp inhales.

  5. Try a fresh pod

    • Occasionally a pod itself might have tighter/looser tolerance than usual.

When to replace the device

  • Airflow is blocked even with pod removed, suggesting internal body damage.

  • The device has taken heavy physical damage and airflow can’t be corrected.

9. Battery Draining Faster Than Expected

If your JNR P4’s battery seems to be dying very quickly, it might not be a fault – but it can also signal a worn-out cell.

Common causes

  • Heavy use: long, frequent puffs.

  • Screen brightness and animations using more power.

  • Older battery losing capacity over time.

  • Extreme temperatures.

  • Pods with electrical issues causing extra load.

Step-by-step fixes

  1. Moderate your usage

    • Try shorter sessions instead of continuous chain vaping.

  2. Fully charge before use

    • Let the device reach full charge rather than small top-ups throughout the day.

  3. Keep it at room temperature

    • Avoid leaving it in a hot car or freezing environment; both harm battery performance.

  4. Check pod condition

    • A shorted or faulty pod can cause the device to drain faster.

  5. Monitor usage pattern

    • Heavy all-day use will drain even a 1200mAh battery more quickly.

  6. Replace the device if battery is clearly worn

    • If you used to get almost a full day and now only get a few hours with the same pattern, the battery is likely nearing the end of its life.

10. Flavour Tastes Mixed After Switching (Dual-Flavour Pods Issue)

One of the JNR P4’s selling points is dual-flavour capability, but that also means the coil and airflow path might briefly mix flavours when you switch.

Why this happens

  • The wick and coil hold onto the previous flavour.

  • The air path and chimney contain vapour from the last flavour.

  • Switching back and forth quickly doesn’t give the wick time to adjust.

Step-by-step fixes

  1. Fully twist/select the flavour

    • Make sure the device is clearly on pod/flavour A or pod/flavour B, not in between.

  2. Take a few “transition” puffs

    • 3–6 gentle puffs will help push the new flavour through the coil and wick.

  3. Clear the airflow

    • Remove the pod and blow lightly through the mouthpiece, then wipe moisture away.

  4. Use fresh pods for the cleanest flavour

    • If you constantly switch flavours on the same pod over many refills, the coil will eventually taste muddled.

  5. Manage your expectations

    • A tiny bit of flavour overlap is normal in any dual-flavour system that shares a coil and chimney.

When to replace the pod

  • Flavour stays muddy, sour or unpleasant even after several puffs.

  • The pod has been used for a long time and your taste buds tell you it’s simply done.

Final Thoughts

The JNR P4 Stellarc 100K is a feature-rich hybrid pod kit with:

  • High puff capacity

  • Dual flavours

  • Auto-refill containers

  • Replaceable pods

  • A large 1200mAh battery

  • A curved display and adjustable airflow

Because it’s more advanced than a simple disposable, it’s normal to occasionally experience issues

Older post
Back to blog