Oxygen Concentrator Alarms — What Each One Means

It is 2 am. The home concentrator in your father's room suddenly starts beeping. He is on 3 L/min for COPD. The display is flashing. The green light is gone. You run to the room, half-asleep, and realise you have no idea what the alarm means. Is the machine dying? Is he not getting oxygen? Do you call the ambulance? For families managing a loved one on home oxygen in Lahore, Islamabad or Rawalpindi, this scenario happens eventually. The alarms are built into the machine for safety — each one means something specific. Knowing which alarm means "problem to fix" vs "replace the machine now" turns a terrifying moment into a manageable one.

This article walks through the common alarms on home oxygen concentrators, what each one points to, and what action to take. Nothing here replaces the specific instructions of the treating consultant on the patient's oxygen prescription.

Why Alarms Exist

Oxygen concentrators have built-in alarms because the patient depends on continuous oxygen. The machine must warn when:

• Oxygen purity drops below safe range
• Power is lost
• Flow is blocked or interrupted
• The machine itself has an internal fault
• Temperature inside the machine is too high
• Service is due

Alarms may be visual (LED lights changing colour) or audible (beeps, continuous tones) or both. Different brands use slightly different conventions, but the main alarm types are standard across brands.

The Common Alarms Explained

1. Power Failure Alarm

Sound: Continuous loud beep.
Display: Usually dark or flashing power icon.
What it means: Mains power to the machine has been lost — load-shedding, tripped breaker, loose plug, or power cut.
Action:

• Check the plug and socket
• Check the mains switch
• If load-shedding, confirm — the alarm continues until power returns or the machine's small internal backup battery runs out (usually a few minutes only)
• Switch patient to backup cylinder immediately
• Press the alarm silence button if available while you investigate
• For areas with regular load-shedding, a UPS and backup cylinder are essential

2. Low Oxygen Purity Alarm (Yellow / Amber)

Sound: Intermittent beeping.
Display: Yellow or amber indicator; sometimes a specific purity reading.
What it means: Oxygen purity has dropped below about 85% but is above 70%. Patient is still getting oxygen but not at full concentration.
Action:

• Wash the sponge air intake filter
• Check for blocked rear vents (move machine away from walls)
• Confirm flow rate is not above the machine's rated maximum
• Allow the machine to run 15–30 minutes after any fix
• If yellow light persists, service is needed

For a detailed breakdown of causes and fixes, see our oxygen concentrator low purity troubleshooting page.

3. Low Oxygen Purity Alarm (Red)

Sound: Continuous beeping or faster intermittent.
Display: Red indicator.
What it means: Purity has dropped below about 70%. The oxygen coming out is barely more concentrated than room air.
Action:

• Switch patient to backup oxygen cylinder
• Call Shine Medical Equipment for same-day service or replacement unit
• Do not rely on the machine while the red light is on
• If no backup cylinder available and patient is dependent, get to hospital

4. No Flow Alarm

Sound: Alarm after startup, or during operation.
Display: Flow icon flashing, or specific error code.
What it means: Machine detects that oxygen is not flowing out as it should.
Action:

• Check tubing for kinks all the way from machine to patient
• Check cannula for blockage — swap in a fresh cannula if in doubt
• Check humidifier bottle — is it screwed on correctly, is the bubbler stem in place
• Check that the flow meter knob is actually set to a flow (sometimes bumped to zero accidentally)
• If none of the above resolves, call for service

5. High Temperature Alarm

Sound: Beeping with specific indicator.
Display: Temperature or thermometer icon.
What it means: Internal temperature of the machine has exceeded safe limits. Common in Lahore and Twin Cities summers.
Action:

• Switch machine off, allow to cool
• Move to a cooler, well-ventilated location — not against walls, not under beds, not in a cupboard
• Minimum 30 cm clearance all around for air flow
• Not in direct sunlight
• Air-conditioned or at least fan-cooled room preferred in summer
• Clean air filter — a clogged filter raises internal temperature
• Switch to backup cylinder while machine cools
• If alarm returns after cooling, service is needed

6. High Pressure Alarm

Sound: Specific beep pattern.
Display: Pressure indicator.
What it means: Pressure inside the oxygen delivery circuit is too high — usually from blocked tubing, humidifier issue, or occlusion.
Action:

• Check tubing for kinks or blocks
• Check humidifier bottle for over-fill or blocked stem
• Check that the cannula is not pinched
• If none of the above, internal valve issue — needs service

7. Service Required / Technical Fault Alarm

Sound: Specific tone, often with error code.
Display: Specific icon (wrench, spanner, exclamation) or alphanumeric code.
What it means: Internal diagnostic has detected a fault. Compressor, electronics, valve, sieve bed problem.
Action:

• Note the error code — this helps the technician diagnose faster
• Switch to backup oxygen
• Call Shine Medical Equipment with the model and error code
• Replacement unit usually sent for rental customers

8. Maintenance Reminder Alarm

Sound: Soft beep at startup or at intervals.
Display: Service hours icon.
What it means: Machine has run a certain number of hours and scheduled maintenance is due. Not an urgent fault.
Action:

• Patient is safe to continue using the machine
• Schedule maintenance within a few days
• Clean filters as usual in the meantime

9. Battery Alarm (Portable Concentrators)

Sound: Beep with battery icon.
What it means: Portable concentrator battery is low or depleted.
Action: Plug into mains, or switch to a charged spare battery, or switch to cylinder oxygen.

10. Compressor Fault / Running Issues

Some machines display specific compressor fault alarms. These usually mean the compressor is failing or has stopped. The machine may continue to appear to run but is not producing concentrated oxygen. Switch to backup oxygen immediately and call for a replacement unit.

Alarm Quick Reference Table

Backup Oxygen — Not Optional for Dependent Patients

For any patient dependent on continuous oxygen — severe COPD, pulmonary fibrosis, late-stage lung disease, oxygen-dependent heart failure, post-ICU recovery — a backup oxygen cylinder is essential. Reasons:

• Load-shedding is a regular reality in Pakistan
• Concentrators can fail without warning
• A full cylinder gives hours of oxygen while the machine is serviced or replaced
• Transporting the patient to hospital requires portable oxygen
• Backup takes the pressure off the family in a crisis

Our standard options for backup oxygen cylinders are listed on our main service pages — see oxygen cylinder refill Lahore, oxygen cylinder refill Islamabad, and the main oxygen concentrator rent page.

Current Shine Medical Equipment Options

Prices as of October 2026. Rental includes replacement unit if yours develops a fault; purchase includes initial service warranty.

Preventing Alarms — Maintenance Basics

• Weekly sponge filter wash
• Monthly HEPA filter check
• Humidifier bottle cleaning twice weekly, correct water level
• Nasal cannula changed every 2 weeks
• Tubing changed every month or when discoloured
• Keep the machine in a clean, cool, ventilated place with clearance all round
• Voltage stabiliser for low-voltage areas
• Backup cylinder on hand for dependent patients
• Annual professional service for continuous-use machines

Families who maintain their equipment this way see significantly fewer alarms and longer life from the unit.

About Shine Medical Equipment

Shine Medical Equipment supplies and rents home oxygen concentrators, cylinders, hospital beds, ventilators, BiPAPs, CPAPs, suction machines, nebulisers, cardiac monitors, infusion pumps and other home medical equipment across Lahore, Islamabad and Rawalpindi. For families setting up care in the home around a chronic respiratory, post-ICU, elderly or palliative patient, reliable oxygen is at the centre of the plan.

Rental is often the practical choice over purchase for the simple reason that service and replacement are included. A patient who cannot wait days for a repair gets a replacement unit same-day in most central areas of Lahore and Islamabad.

For related equipment and services, see our main oxygen concentrator rent page, hospital bed rent for bedridden patients, suction machine rent for secretion management, BiPAP on rent for respiratory support, and medical equipment rental for the full catalogue. Families often combine equipment rental with home nursing — the home care help from a trained attendant alongside the equipment keeps the set-up functioning safely for the patient.

Call or WhatsApp 0344-9226778 for any oxygen alarm issue, replacement units, or new rentals.

Frequently Asked Questions

This article is a general equipment guide. Oxygen prescriptions and flow rates must follow the treating consultant's instructions. For respiratory emergencies — gasping, blue lips, falling saturation, confusion — call 1122 or go to hospital. External reference: American Lung Association — Oxygen Therapy.