Can I fix this myself?

Yes. This is a user-serviceable condition and the steps above are the ones the manufacturer publishes. If it returns straight after you complete them, stop and book service.

Where do these steps come from?

They are transcribed from Philips support article XC000004106. We do not repair machines and we do not publish a fix we cannot cite to the manufacturer.

Will this code clear on its own?

Maintenance prompts clear when the cycle they are asking for is completed in full — stopping partway usually leaves the counter running. Fault codes clear when the underlying condition is corrected, not by power-cycling past them.

Philips Error 05: Air trapped in the water circuit — Causes and Fixes

You can fix thisUpdated August 3, 2026

Philips

05 — Air trapped in the water circuit

You can fix this

What the machine is reporting

Air is trapped in the water circuit

Likely causes, most likely first

Water tank run dry
Water tank not seated correctly
AquaClean filter not soaked/primed before installation

What to do

1. Empty the water tank and remove the water filter if one is fitted.
2. Refill the water tank with fresh water and reinsert it fully.
3. Switch the machine on.
4. Dispense 2-3 cups of hot water.
5. If you use an AquaClean filter, prepare and reactivate it according to the filter instructions afterwards.

Source: Philips support article XC000004106. Transcribed from Philips's own published documentation — we do not repair machines and do not publish fixes we cannot cite.

When to stop and call a technician

The machine trips a breaker, smells of burning, or shows scorched wiring.
Water is leaking from inside the chassis rather than from the tank, tray or portafilter.
The fault involves the boiler, a pressure valve, the heating element or the pump itself.
The code returns immediately after a correctly completed reset or maintenance cycle.
The machine is under warranty — opening it yourself usually ends that cover.

Never bypass, disable or remove a safety device — a thermal fuse, pressure relief valve or lid interlock is the part standing between a fault and a fire. Do not open a pressurised boiler or work on mains wiring.

Machines this applies to

What the fix needs

Water filter
A filter slows how fast scale returns after the fix. It does not replace descaling.
Find on Amazon

As an Amazon Associate we earn from qualifying purchases. These are category searches, not product endorsements — always use the consumable your machine's own manual specifies.

Other Philips codes

03 — Brew group too dirty
CALC / CLEAN — Descale prompt
AquaClean light flashing orange — AquaClean filter needs replacing
02 — Machine requires repair
10 — Machine requires repair
15 — Machine requires repair

All Philips error codes →

Frequently asked

What does Philips 05 mean?: Air is trapped in the water circuit
Can I fix this myself?: Yes. This is a user-serviceable condition and the steps above are the ones the manufacturer publishes. If it returns straight after you complete them, stop and book service.
Where do these steps come from?: They are transcribed from Philips support article XC000004106. We do not repair machines and we do not publish a fix we cannot cite to the manufacturer.
Will this code clear on its own?: Maintenance prompts clear when the cycle they are asking for is completed in full — stopping partway usually leaves the counter running. Fault codes clear when the underlying condition is corrected, not by power-cycling past them.