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Error code reference

Hotpoint Dishwasher Error Code AL05

Pressure switch non compliant

Hotpoint codesHotpoint dishwasher codes

Pressure switch non compliant - The main board has registered the failure of the pressure switch (during static filling after set litres the pressure switch did not make the FULL contact, or at the end of heating timeout the pressure switch is still in the EMPTY position).

First step from the service manual

Check if pressure switch is stuck on empty; check pressure switch hose for puncture or disconnection; check sump air trap for blockage; check for excess suds in machine.

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

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What AL05 means on a Hotpoint dishwasher

The AL05 error code on a Hotpoint dishwasher indicates a pressure switch compliance failure. The main control board monitors the pressure switch during the filling cycle and during heating. Specifically, AL05 is triggered in two scenarios: the pressure switch fails to register a FULL contact after a set volume of water has entered the machine during static filling, or the pressure switch remains in the EMPTY position at the end of the heating timeout. The pressure switch itself is a pneumatic sensor connected to the sump via a small air trap and hose. As water rises in the tub, air pressure increases in this sealed chamber and hose, actuating the switch through defined contact positions including EMPTY and FULL.

The most likely causes of this fault involve the mechanical or pneumatic path between the water level and the switch itself. A blocked sump air trap will prevent accurate pressure transmission, keeping the switch reading EMPTY even when water is present. A punctured or disconnected pressure switch hose will similarly allow air to escape, preventing the pressure buildup needed to move the switch to the FULL position. The switch itself may also be mechanically stuck in the EMPTY position due to debris, corrosion, or internal failure.

Excess suds in the tub can also interfere with pressure switch operation by creating a foam layer that disrupts the air-water interface in the sump, leading to inconsistent or false pressure readings. When diagnosing AL05, technicians should follow a logical path from the air trap and hose integrity through to switch continuity and control board signal verification.

Source: manufacturer service documentation.

Common causes of AL05

  1. 01

    Blocked sump air trap

    Wiring / connection

    The sump air trap is a small chamber that transmits water level pressure to the pressure switch via a hose. Debris or scale buildup inside the trap can block airflow, preventing the switch from reaching the FULL contact position. Inspect and clean the air trap to restore proper pressure transmission.

  2. 02

    Punctured or disconnected pressure switch hose

    Wiring / connection

    The hose connecting the sump air trap to the pressure switch must be fully sealed to maintain pneumatic pressure. A split, crack, or loose connection in this hose will cause air to escape, keeping the switch stuck in the EMPTY position regardless of actual water level. Visually inspect the full length of the hose for damage or disconnection.

  3. 03

    Pressure switch stuck in EMPTY position

    Part replacement

    The pressure switch itself can become mechanically stuck in the EMPTY position due to internal corrosion, debris ingress, or component fatigue. If the hose and air trap check out correctly, test the switch directly for continuity changes as pressure is manually applied. A faulty switch will need replacement.

  4. 04

    Excess suds in the tub

    Wiring / connection

    Using non-dishwasher detergent or too much detergent can produce excessive foam, which disrupts the air-water interface in the sump and causes inaccurate pressure switch readings. Run a rinse cycle without detergent to clear the suds and observe whether the fault clears.

  5. 05

    Main control board fault

    Part replacement

    If the pressure switch, hose, and air trap all test correctly, the control board may be failing to read the switch signal accurately. This is the least common cause and should only be considered after all other components have been ruled out. Board replacement requires correct identification of the board for the specific model.

See the test procedure for each cause

Frequently asked questions about AL05

What does AL05 mean on a Hotpoint dishwasher?
AL05 indicates a pressure switch compliance failure. The control board monitors the pressure switch during filling and heating, and this code appears when the switch fails to register a FULL water level after the set fill volume is reached, or remains in the EMPTY position at the end of the heating cycle. The fault points to a problem in the water level sensing system, which includes the pressure switch, its connecting hose, and the sump air trap.
How do I fix AL05 on a Hotpoint dishwasher?
Start by checking the sump air trap for blockage and cleaning it if necessary. Inspect the pressure switch hose for any punctures, cracks, or loose connections and reseat or replace it if needed. Also check for excessive suds in the tub, which can cause false readings. If those checks pass, test the pressure switch itself for correct operation and replace it if it is stuck in the EMPTY position.
Will resetting the dishwasher clear the AL05 error?
A reset may temporarily clear the AL05 code, but if the underlying fault is still present the error will return during the next wash cycle. Resetting is useful to confirm whether the fault is intermittent, but it is not a fix. The root cause involving the pressure switch, hose, or air trap needs to be addressed before the machine will operate reliably.
Is it safe to use my Hotpoint dishwasher when AL05 is showing?
It is not recommended to continue running the dishwasher while AL05 is active. The error indicates the machine cannot confirm the correct water level, which means it may run the heating element without sufficient water present. This could damage the heating element or other internal components. Diagnose and resolve the fault before resuming normal use.
How much does it cost to repair an AL05 fault on a Hotpoint dishwasher?
If the repair involves only cleaning the air trap or reseating a disconnected hose, the cost is minimal and often a straightforward DIY task. Replacing a faulty pressure switch typically costs between 15 and 50 dollars for the part, with additional labor costs if a technician is hired. If the fault traces back to the main control board, repair costs can range from 100 to 250 dollars or more depending on the model and labor rates in your area.

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