E08
Bosch Dishwasher
Severity: ModerateWhat Does This Error Mean?
The E08 error means the water level sensor detected that there is not enough water in the dishwasher during the wash cycle. The dishwasher cannot operate safely or effectively with insufficient water. It stops the cycle to prevent the heating element from running dry.
Affected Models
- Bosch 300 Series
- Bosch 500 Series
- Bosch 800 Series
- Most Bosch built-in dishwashers
Common Causes
- Water inlet valve is not fully opening, restricting water flow into the tub
- Inlet water supply pressure is too low
- Water level pressure sensor (aquasensor) has failed
- Inlet hose is kinked, pinched, or partially blocked
- Water fill timeout — the machine could not fill to the correct level in time
How to Fix It
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Check the water supply valve under the sink — make sure it is fully open.
The valve should be turned fully counterclockwise to maximize water flow.
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Inspect the inlet hose running from the shut-off valve to the dishwasher.
Pull the dishwasher out slightly and check the full hose length for kinks or pinches.
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Check your home water pressure — it should be at least 20 PSI.
Very low water pressure (common in older homes) can prevent the dishwasher from filling properly.
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Power cycle the dishwasher — unplug for 5 minutes and restart.
A reset clears temporary sensor faults. If the machine fills normally after a reset, the error may have been a one-time glitch.
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If E08 persists with good water pressure and an unobstructed hose, the water inlet valve or level sensor needs replacement.
Do not run cycles repeatedly with insufficient water — the heating element can be damaged.
When to Call a Professional
If checking the water supply and inlet hose does not resolve E08 — the water inlet valve or pressure sensor likely needs replacement. Expect $90–$200 for parts and labor from a certified technician.
Frequently Asked Questions
Can low water pressure cause E08?
Yes — if your home water pressure is below 20 PSI, the dishwasher may not fill quickly enough. A plumber can measure your water pressure. If pressure is low throughout your home, a pressure booster pump may be needed.
What happens if the dishwasher runs with too little water?
The heating element can overheat and burn out without enough water to absorb the heat. Dishes will also not be cleaned properly. The E08 error is designed to prevent this — do not try to bypass or ignore it.
How do I know if the Bosch water inlet valve is faulty?
If water fills very slowly (more than 5 minutes for a full fill) or does not fill at all — the valve is likely partially blocked or failed. You can hear the inlet valve open at the start of a cycle — a faulty valve is often silent. A technician can test the valve with a multimeter.