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Error code reference

Bosch Dryer Error Code E:3040

Water handling system

Bosch codesBosch dryer codes

Water handling system - condensate tank and basegroup full (Malfunction) (4-digit equivalent of E:03).

First step from the service manual

Empty condensate container.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:3040 means on a Bosch dryer

Error code E:3040 on a Bosch dryer indicates a malfunction within the water handling system, specifically that both the condensate tank and the basegroup are detected as full. This code is the 4-digit equivalent of E:03 and applies to condenser dryers that collect moisture extracted from laundry in an internal condensate reservoir rather than draining it externally. When the condensate tank reaches capacity, the machine halts operation to prevent overflow into the drum area or surrounding cabinetry.

The water handling system in these dryers works by routing humid air through a heat exchanger or condenser unit, converting moisture into liquid condensate that is then pumped into the removable tank. The basegroup refers to the lower structural assembly that houses the pump, sump, and associated water routing components. When the system registers both the tank and basegroup as full, it typically means the tank was not emptied before reaching capacity, or the condensate pump failed to move water effectively, allowing the basegroup sump to flood.

Common triggers include neglecting to empty the condensate drawer after cycles, a blocked or kinked drain hose if the unit is plumbed for external drainage, a failed condensate pump, or a faulty water level sensor giving a false full reading. In some cases, debris or lint accumulation in the basegroup sump can obstruct the pump inlet, causing water to back up and trip the sensor even when the visible tank appears only partially full.

Source: manufacturer service documentation.

Common causes of E:3040

  1. 01

    Condensate tank not emptied

    Wiring / connection

    The removable condensate drawer was not emptied between cycles or was left too long, allowing it to reach maximum capacity. This is the most frequent cause and is resolved by pulling out the tank and emptying it completely.

  2. 02

    Condensate pump failure

    Part replacement

    If the unit is set up for continuous external drainage, a failed pump will prevent water from being moved out of the basegroup sump, causing it to flood. Listen for the pump running at the end of a cycle; silence or unusual noise can indicate pump failure.

  3. 03

    Blocked or kinked drain hose

    Wiring / connection

    On units plumbed for direct drainage, a kinked, clogged, or improperly routed drain hose will back water up into the basegroup. Inspect the full length of the hose for obstructions or tight bends.

  4. 04

    Lint or debris blocking the basegroup sump

    Wiring / connection

    Lint accumulation in the lower sump area can obstruct the pump inlet, preventing effective water removal even when the external tank appears partially empty. The sump and pump inlet screen should be cleaned periodically.

  5. 05

    Faulty water level sensor

    Part replacement

    A defective float switch or level sensor in the basegroup can send a false full signal to the control board even when water levels are normal. This is identified by the error persisting after the tank is emptied and the basegroup is confirmed dry.

See the test procedure for each cause

Frequently asked questions about E:3040

What does E:3040 mean on a Bosch dryer?
E:3040 is a water handling system malfunction indicating that both the condensate tank and the basegroup are detected as full. It is the 4-digit equivalent of error code E:03. The dryer halts operation to prevent water overflow. Emptying the condensate drawer is the first step to resolving it.
How do I fix the E:3040 error on my Bosch dryer?
Start by pulling out the condensate drawer, emptying it fully, and reinserting it securely. If the error clears, resume normal use and make a habit of emptying the tank after every one or two cycles. If the error persists after emptying the tank, inspect the drain hose for kinks or blockages, and check the basegroup sump area for lint buildup or standing water that may point to a pump issue.
Is it safe to keep using my Bosch dryer when E:3040 is showing?
No, you should not continue operating the dryer while E:3040 is active. The error indicates water has accumulated in the basegroup, which is the lower mechanical assembly of the machine. Running the dryer with standing water in that area could damage the pump, motor, or electrical components. Address the cause before restarting.
Will resetting the dryer clear the E:3040 error?
A reset alone will not permanently clear E:3040 if the underlying condition has not been corrected. The error will return as soon as the machine detects the condensate tank or basegroup is full again. You must empty the condensate tank and confirm the basegroup has drained before a reset will hold. If the error comes back quickly after emptying the tank, a pump or sensor fault may be present.
How much does it cost to repair a Bosch dryer showing E:3040?
If the fix is simply emptying the condensate tank, there is no parts cost involved. If the condensate pump has failed, replacement pump parts typically range from around 40 to 120 dollars depending on the specific model, with professional labor adding 80 to 200 dollars or more. A faulty water level sensor is generally in a similar parts cost range. Diagnosing the root cause before ordering parts helps avoid unnecessary expense.

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