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Owner guide

Quooker troubleshooting: the six most common faults and what to check first (2026)

When a Quooker stops giving boiling water, the cause is often outside the tap: power, water supply or limescale. This guide goes through six faults in the order worth checking them. It gives general checks and not model-specific procedures, because the manual for your tap is the source for those. Where a fault involves electrics or water under pressure, stop and call an installer.

No boiling water

Check the supply first. The unit under the sink needs power, so look at the socket or the switch that feeds it and at the fuse or trip for that circuit. It also needs cold water, so check that the valve on the supply to the unit is open. If power and water are both fine, the cause sits inside the unit, and that is a job for the manual and your installer.

Water leaking

A leak under the sink can come from a connection, the unit or the tap, and it is hard to tell which from outside. Because water and electricity sit close together here, switch off the power to the unit, close the water valve to it if you can reach it safely, and call an installer. Do not open the unit yourself.

Light flashing

The light patterns differ per model, and we hold no list of them. Look in the manual that came with your tap for the pattern you see. If you no longer have it, ask the manufacturer or your installer, and tell them which model you own. The Quooker page lists every current model by name.

Low flow or low pressure

Weak flow from the tap can come from the water supply to the unit, from a partly closed valve, or from limescale in the spout or the aerator. Compare it with the cold tap next to it. If the cold tap is weak too, the cause is your supply and not the Quooker. If only the Quooker is weak, a descale is the next thing to try, following the manufacturer's instructions.

Limescale

Hard water leaves limescale in a boiling water tap sooner than soft water does, and limescale is a common reason for weak flow and extra noise. How often to descale depends on your water and on the manufacturer's advice for your model, and we have no sourced interval for Quooker, so we give none. Our maintenance and descaling review explains why water hardness matters and what upkeep costs across boiling water taps.

Noise

A boiling water tap makes some noise when it heats and refills, and that alone is not a fault. A new or louder sound is worth a look: limescale is one common cause, and a change after a power cut or work on the water supply is another. Note when it happens and tell your installer, since a description of the sound helps more than a guess.

Filter and warranty

Some Quooker models list an active carbon filter inside the tank in our data, and none has a replacement interval, so we give none. For filters across all brands, see the filter guide. Every current Quooker model in our library lists a warranty of 2 years. Our data holds the length and not the terms, so read the manufacturer's conditions before you pay for a repair, and see the Quooker warranty guide for the length per model and against other brands. Installation details are in the installation guide.

Questions people ask

Why is my Quooker not giving boiling water?
Start with the supply. Check that the unit under the sink has power and that the cold water valve to it is open. If both are fine and the tap still gives no boiling water, the manual for your model and your installer are the next step, because the cause then sits inside the unit.
What does a flashing light on my Quooker mean?
It depends on the model, so we do not list codes here. The manual that came with your tap explains what each light pattern means. If you no longer have it, the manufacturer or your installer can tell you for your exact model.
Can I fix a leaking Quooker myself?
We advise against it. A leak under the sink involves both water and electricity. Switch off the power to the unit, close the water valve to it if you can reach it safely, and call an installer from our directory.
How often should I descale a Quooker?
That depends on how hard your water is and on the manufacturer's instructions for your model. Our maintenance and descaling review explains why hard water matters. We have no sourced interval for Quooker, so we give none.
Is a Quooker repair covered by the warranty?
Every current Quooker model in our library lists a warranty of 2 years. Our data holds the length of the warranty and not its terms, so check the manufacturer's conditions and contact them or your installer before you pay for a repair. 6 of 11 models list a filter in our data, and none has a replacement interval.