- Appliances
- Coffee machines
Please refill water tank
Siemens coffee machine Please refill water tank: tank alert
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
The screen asks you to refill the water tank even when water is inside: fill with fresh cold still tap water, seat the tank straight, and bleed any air from the filter. If the prompt remains after cleaning the float and descaling, contact Siemens Service.
Safety first
Stop and check this first
- The water tank contains permanent magnets that can affect electronic implants such as pacemakers or insulin pumps: keep a minimum distance of 10 cm from the appliance and the removed water tank.
- Never wash the water tank or water tank lid in a dishwasher, and never fill the tank with milk, hot water, or carbonated water.
Safe checks you can perform
- Fill with fresh still tap water and insert straight
- Clean the water tank by hand and free the float
- Bleed air bubbles from the water filter or replace it
- Clean scale from the tank and run the descaling programme
Leave these tasks to a qualified professional
- Do not attempt this professional task: Inspection of the water level sensor and tank valve coupling
- Do not attempt this professional task: Workshop check of internal water intake and flow path
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Inspection of the water level sensor and tank valve coupling
What they doAuthorised Siemens Service check of the magnetic float sensor inside the housing and the mechanical tank inlet valve.
They must show youthe live test with a filled water tank demonstrating whether the level sensor or inlet valve fails to engage.
In writingthe Siemens Service job reference and the test outcome for the tank level sensor and inlet seal.
Workshop check of internal water intake and flow path
What they doService centre inspection of the internal water pipes and inlet assembly when water cannot enter despite a bled filter and descaled tank.
They must show youa normal hot water or rinse cycle after servicing the internal water path.
In writingan itemised list of any replaced inlet parts or seals along with the repair warranty terms.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Fill with fresh still tap water and insert straight
- Who:
- You, at the coffee machine next to a cold water tap.
- How:
- Empty the tank if carbonated water was used, refill up to the max mark with fresh, cold, non-carbonated tap water, and slide the water tank straight into its holder.
- Result that matters:
- Whether the water tank sits flush in its bay and the display clears.
- If the prompt clears right away:
- carbonated water or crooked seating caused the alert.
- If Please refill water tank stays on the display:
- inspect and clean the float inside the tank.
- Evidence to keep:
- Photo showing the water tank filled to max and seated straight in its holder.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual · Understanding your EQ.500 coffee machine display messages · Siemens EQ700 coffee machine display messages explained
Clean the water tank by hand and free the float
- Who:
- You, washing the removed water tank at the sink.
- How:
- Remove the water tank, wash it thoroughly by hand under running water without putting it in the dishwasher, and check that the internal float moves up and down freely.
- Result that matters:
- Whether the magnetic float rises smoothly when the tank is filled with tap water.
- If the float rises and the machine recognises the level:
- residue was holding the float down.
- If the float moves freely but the display still asks for water:
- check the water filter next.
- Evidence to keep:
- Short clip showing the float rising freely when clean tap water fills the tank.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual · Understanding your EQ.500 coffee machine display messages · Siemens EQ700 coffee machine display messages explained
Bleed air bubbles from the water filter or replace it
- Who:
- You, using a glass of water to submerge the filter cartridge.
- How:
- If a water filter is fitted, immerse it in a glass of water with the opening facing upwards and press the sides lightly until no more air bubbles escape, or replace it if used for 2 months, then activate and rinse it.
- Result that matters:
- Whether air bubbles stop escaping and water flows cleanly during the filter rinse.
- If the refill message disappears after bleeding or replacing the filter:
- air was blocking flow.
- If the prompt remains even after removing the old filter cartridge:
- check for scale in the tank.
- Evidence to keep:
- Note of the filter installation date and photo of the display when tested without the filter.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual · Understanding your EQ.500 coffee machine display messages · Siemens EQ700 coffee machine display messages explained
Clean scale from the tank and run the descaling programme
- Who:
- You, running the official Siemens descaling cycle.
- How:
- When limescale deposits are visible in the water tank, clean the tank thoroughly and start the official descaling programme to clear scale blocking the system.
- Result that matters:
- Whether the descaling and rinsing sequence finishes and restores normal water intake.
- If drink preparation works again after descaling:
- scale deposits were obstructing the inlet.
- If the display continues showing Please refill water tank with a clean full tank:
- contact Siemens Service.
- Evidence to keep:
- Photo of the display prompt alongside the cleaned, filled water tank.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Siemens
- Product type
- Coffee machines
Known code variants
- Cafetera Siemens depósito lleno pero pide agua
- Siemens EQ.300 Llenar el depósito de agua
- Siemens EQ.500 Llenar el depósito de agua
- Siemens EQ.500 Please refill water tank
- Siemens EQ700 Please fill water tank
- Siemens Fill water tank
- Siemens Llenar el depósito de agua
- Siemens Please fill water tank
- Siemens Please refill water tank
What it means
On the official Siemens support pages for EQ.500 and EQ700 coffee machines and in the EQ.500 (TP5/TP51) user manual, Please refill water tank (or Please fill water tank on EQ700 and Fill water tank on EQ.3/EQ300) means the appliance does not register water level or flow, even if the tank is full. Other Siemens EQ models may phrase the prompt slightly differently or flash LEDs if the internal pipe system is dry. This message by itself never proves that an internal component has failed: it is usually triggered by a tilted tank, carbonated water, a stuck float, air trapped in the water filter, or limescale.
Warnings and stop conditions
- Higheditorial warning
The water tank contains permanent magnets that can affect electronic implants such as pacemakers or insulin pumps: keep a minimum distance of 10 cm from the appliance and the removed water tank.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual
- Mediumeditorial warning
Never wash the water tank or water tank lid in a dishwasher, and never fill the tank with milk, hot water, or carbonated water.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual
Symptoms and causes
Probable causes · in order
- Water tank inserted crookedly or filled with sparkling waterCommon
The tank is not seated straight in its holder or contains carbonated water that prevents proper level detection.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual · Understanding your EQ.500 coffee machine display messages · Siemens EQ700 coffee machine display messages explained
- Float stuck inside the water tankCommon
The magnetic float inside the water tank has jammed in the lower position and fails to rise when water is added.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual · Understanding your EQ.500 coffee machine display messages · Siemens EQ700 coffee machine display messages explained
- Air trapped in the water filter or filter older than two monthsPossible
A new water filter was not immersed to release air bubbles before installation, or an exhausted filter is restricting flow.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual · Understanding your EQ.500 coffee machine display messages · Siemens EQ700 coffee machine display messages explained
- Limescale deposits in the water tank blocking the systemPossible
Scale buildup inside the tank or at the water inlet obstructs water intake and triggers the refill prompt.
Evidence: EQ.500 classic TP5 fully automatic espresso machine user manual
Virtual technician
Does Please refill water tank still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
EQ.500 classic TP5 fully automatic espresso machine user manual
Siemens · 2020 · official_doc
- 2
Siemens · 2026 · official_doc
- 3
Mensajes en las Cafeteras EQ.500
Siemens · 2026 · official_doc
- 4
Understanding your EQ.500 coffee machine display messages
Siemens · 2026 · official_doc
- 5
Mensajes en las Cafeteras EQ.300
Siemens · 2026 · official_doc
- 6
Siemens EQ700 coffee machine display messages explained
Siemens · 2026 · official_doc
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