- Appliances
- Coffee machines
Check water tank
Bosch Check water tank on coffee machine: water supply issue
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
On the Bosch TES515 coffee machine, Check water tank means the machine is not drawing water properly from the tank. Check the tank is seated, filled with still tap water, the float moves freely and the filter is prepared correctly.
Safety first
Stop and check this first
- Do not open the housing to inspect the pump or water inlet: Bosch warns of electric shock and reserves repairs for trained staff.
- Use only cold, fresh, still water in the tank, as Bosch asks; carbonated water triggers this message.
Safe checks you can perform
- Tank seated and right water
- Float free and tank clean
- Water filter: air, rinse and age
Leave these tasks to a qualified professional
- Do not attempt this professional task: Check of the water inlet circuit
- Do not attempt this professional task: Drinks test after the repair
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.
Check of the water inlet circuit
What they doBosch service checks the tank connection, the water level detection and that the machine draws water normally.
They must show youthe machine drawing water and the tank detection working.
In writingthe cause found and any part replaced, with its reference.
Drinks test after the repair
What they doWhen finished, the technician makes coffee and hot water with a full tank and confirms the message does not return.
They must show youthe drinks made without the warning.
In writingthe test carried out and the date.
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.
Tank seated and right water
- Who:
- you, no tools.
- How:
- remove the tank, empty it, fill it with fresh, cold, still tap water no higher than the max mark, refit it and push it firmly downward until it sits in place.
- Result that matters:
- the message clearing once the tank is refitted.
- If it clears:
- the tank was not seated or held carbonated water.
- If it stays:
- check the float.
- Evidence to keep:
- a note of what water was in the tank.
Evidence: TES515.. instruction manual
Float free and tank clean
- Who:
- you.
- How:
- with the tank out, see whether the float moves freely; if it sticks, clean the tank thoroughly as Bosch says and refit it.
- Result that matters:
- a float that rises and falls without catching.
- If the message goes after cleaning:
- the float was stuck.
- If the float is free and the message stays:
- go to the filter.
- Evidence to keep:
- a photo of the tank interior before cleaning.
Evidence: TES515.. instruction manual
Water filter: air, rinse and age
- Who:
- you.
- How:
- if you use a filter, dip it in water until no more bubbles escape and refit it pressing straight down; if it is new, rinse it through the No / Old filter and Activate filter menu as the manual explains; if it is over two months old or Change filter! appeared, replace it.
- Result that matters:
- a filter that is free of air, rinsed and in date.
- If the message clears:
- the filter was the problem.
- If it stays with the filter prepared correctly:
- try without a filter, set to No / Old, to rule it out.
- Evidence to keep:
- the month you fitted the filter, which you can mark on its indicator.
Evidence: TES515.. instruction 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
- Bosch
- Product type
- Coffee machines
Known code variants
- Bosch cafetera comprobar depósito de agua
- Bosch Check water tank
- Bosch coffee machine check water tank
- Bosch TES515 check water tank
- Bosch VeroCafe check water tank
- Bosch VeroCafe check water tank message
- Check water tank
What it means
Bosch gives six reasons for Check water tank in the TES515 manual: tank wrongly inserted, carbonated water, float stuck, new water filter not rinsed as instructed, air in the filter or an old filter. The float tells the machine how much water is left; the filter, if used, sits in the tank connection. Any of these stops the machine detecting or drawing water even with a full tank. The message does not prove the pump is faulty: these checks almost always clear it.
Warnings and stop conditions
- Mediumeditorial warning
Do not open the housing to inspect the pump or water inlet: Bosch warns of electric shock and reserves repairs for trained staff.
Evidence: TES515.. instruction manual
- Lowsource verified
Use only cold, fresh, still water in the tank, as Bosch asks; carbonated water triggers this message.
Evidence: TES515.. instruction manual
Symptoms and causes
Probable causes · in order
- Tank not seatedCommon
The tank is not pushed fully down into place; Bosch asks for it to be inserted correctly and pressed firmly downward.
Evidence: TES515.. instruction manual
- Carbonated water in the tankPossible
The tank holds sparkling water; Bosch says to fill it only with fresh, cold, uncarbonated tap water.
Evidence: TES515.. instruction manual
- Float stuckPossible
The float in the tank cannot move freely because of dirt or scale; remove the tank and clean it thoroughly.
Evidence: TES515.. instruction manual
- New filter not rinsed, or air in itPossible
The filter was fitted without the rinse the manual describes, or has air inside; both block the flow of water.
Evidence: TES515.. instruction manual
- Old filterPossible
The filter is exhausted; Bosch says to replace it when Change filter! appears or after two months at the latest.
Evidence: TES515.. instruction manual
Virtual technician
Does Check 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
Bosch · 2014 · official_doc
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