Asko Dishwasher F7 Error: Water softener fault
Asko dishwasher F7 error is a common issue reported by Asko appliance owners. What Does Error Code F7 Mean on an Asko Dishwasher? Error code F7 relates to the built-in water softener system fitted to most Asko D-series and DBI-series dishwashers. Asko includes an ion-exchange water softener to protect the machine from limescale damage and […]
Yes
DIY Fixable
From $80
Typical Repair Cost
15-30 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. The dishwasher will continue to wash dishes, but without the softener functioning, limescale will gradually accumulate on the element, spray arms, and tub surfaces. Refill the salt as soon as possible to protect the machine.
Can I reset the code?
Yes. F7 typically clears automatically after the salt reservoir is refilled and a rinse or wash cycle runs to flush the brine circuit and reset the sensor.
When to stop immediately?
Stop if you notice: F7 persists even after refilling with correct dishwasher salt and running a full cycle, The salt reservoir fills with water immediately after adding salt, suggesting a cracked reservoir body.
Symptoms You May Notice
White chalky film on dishes, glasses, and cutlery after washing
When the water softener is not functioning, hard water minerals deposit on washed items, leaving a visible white or grey chalky residue that is difficult to wipe off.
Salt refill indicator light is on alongside the F7 code
Most Asko models illuminate a dedicated salt indicator on the control panel in addition to displaying F7, confirming the softener system is the source of the fault.
F7 appears after salt has been added but before a rinse cycle
The fault clears on the next wash after refilling, but if the sensor is slow to respond it may persist on the first cycle after a top-up.
Spotting and cloudiness on glassware increases progressively
Over time, failure to address the softener fault leads to cumulative limescale deposits on the glass interior surfaces that become permanent etching.
Possible Causes
Empty or low salt reservoir
The dishwasher salt in the base reservoir has been depleted and needs refilling with the correct coarse dishwasher salt granules.
DIY PossibleWrong salt type causing sensor misread or blockage
Table salt, rock salt, or flavoured salts can clump in the reservoir, block the brine draw, and confuse the salt level sensor into reading empty.
DIY PossibleFailed salt level sensor
The float-type or conductivity salt sensor is stuck or has failed, causing the controller to permanently read the reservoir as empty even when full of salt.
Requires ProfessionalSafe Checks You Can Do
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1
Refill the salt reservoir
With the lower basket removed, locate the round salt reservoir cap on the tub floor. Unscrew it counter-clockwise. Using the funnel provided with the machine (or a standard kitchen funnel), pour in dedicated coarse dishwasher salt until the reservoir is full. Some water overflow is normal. Screw the cap back on tightly. Run a Rinse program to flush the brine and reset the sensor.
Only use dedicated dishwasher salt (sodium chloride granules). Never use table salt, sea salt, or multi-purpose salt, as these contain anti-caking agents that damage the softener resin.
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2
Check the salt cap seal
Inspect the rubber O-ring on the inside of the salt cap. It should be supple and unbroken. A damaged seal allows rinse water to constantly dilute the brine and drain it prematurely. If the seal is cracked, the cap should be replaced.
Replacement salt caps are inexpensive Asko spare parts — worth keeping a spare.
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3
Verify and adjust the hardness setting
Refer to your Asko model manual to enter the water hardness programming mode (usually accessed by holding a button combination on power-on). Set the hardness level to match your local supply. In very hard water areas, the softener uses salt faster — increase the regeneration frequency setting.
Your water supplier can tell you the local hardness in °dH or ppm. Most UK and European areas range from 10–25 °dH.
When to Call a Professional
Contact a qualified technician if:
- Salt level sensor shows no resistance change when a full reservoir is present
- The regeneration valve does not operate during the programmed regeneration phase
- F7 continues after sensor replacement, suggesting a control board wiring or programming fault
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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