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Error code reference

Ariston Oven Error Code ER17

Heating timeout

Ariston codesAriston oven codes

Heating timeout - oven failed to reach target temperature within 125 minutes.

First step from the service manual

Check mains voltage (oven will not operate below 190V); verify sensor (545 ohms at room temp); check heating element operation and wiring; replace power supply board.

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

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What ER17 means on a Ariston oven

ER17 on an Ariston oven is a heating timeout fault. The oven's control system monitors how long it takes to reach the target cooking temperature after a heating cycle begins. If the cavity temperature has not reached the setpoint within 125 minutes, the control board triggers ER17 and halts operation. This is a protective measure to prevent prolonged energy consumption when a heating fault is present.

The two primary systems involved are the temperature sensing circuit and the heating element circuit. The temperature sensor (NTC type) should read approximately 545 ohms at room temperature. If resistance is out of range, the control board receives an inaccurate temperature reading and may never register that the target temperature has been reached, even if the oven is heating normally. A failed or partially failed heating element is equally likely, as reduced heat output will simply not raise the cavity temperature fast enough to satisfy the 125-minute window.

Mains voltage is a critical factor in diagnosing this fault. The oven requires a minimum of 190V to operate correctly. Voltages below this threshold will reduce element output significantly, causing slow or insufficient heating. If voltage and the sensor check out, the power supply board should be inspected, as it controls power delivery to the heating elements and a fault there can mimic a heating element failure without the element itself being defective.

Source: manufacturer service documentation.

Common causes of ER17

  1. 01

    Low mains voltage

    Wiring / connection

    If the supply voltage drops below 190V, the heating elements cannot produce enough heat to reach the target temperature in time. Check the supply voltage at the oven's terminal block before proceeding with other diagnostics.

  2. 02

    Failed or degraded heating element

    Part replacement

    A burned-out or partially failed heating element will produce little or no heat, making it impossible to reach the setpoint within 125 minutes. Visually inspect the element for damage and test continuity.

  3. 03

    Faulty temperature sensor

    Part replacement

    The NTC temperature sensor should measure approximately 545 ohms at room temperature. An out-of-range reading means the control board cannot accurately track cavity temperature, which can cause a false heating timeout.

  4. 04

    Wiring fault in heating circuit

    Wiring / connection

    Loose connections, burnt terminals, or broken wires between the power supply board and the heating elements can interrupt or reduce power delivery without the element itself being defective. Inspect all wiring and connectors in the heating circuit.

  5. 05

    Faulty power supply board

    Part replacement

    If the power supply board is not correctly delivering voltage to the heating elements, heating output will be insufficient even when mains voltage and elements test correctly. Replace the board if all other components check out.

See the test procedure for each cause

Frequently asked questions about ER17

What does ER17 mean on a Ariston oven?
ER17 is a heating timeout error indicating that the oven failed to reach its target temperature within 125 minutes of starting a heating cycle. The control board monitors cavity temperature throughout the cycle and triggers this fault when the setpoint is not achieved in time. It typically points to a problem with mains voltage, the heating element, the temperature sensor, or the power supply board.
Can I fix ER17 on my Ariston oven myself?
Some diagnostic steps, such as checking whether your home's supply voltage is adequate or visually inspecting the heating element for visible damage, can be done by a knowledgeable DIYer. However, testing the sensor resistance, inspecting internal wiring, and replacing the power supply board involve working with mains voltage inside the appliance and carry a serious risk of electric shock. These steps are best handled by a qualified technician.
Will resetting the oven clear the ER17 error?
Switching the oven off at the power outlet and restarting it may temporarily clear the ER17 code, but if the underlying fault is still present the error will return once the oven attempts to heat again and fails to reach temperature within 125 minutes. A reset is useful for confirming whether the fault is intermittent, but it does not address the root cause.
Is it safe to use my Ariston oven while ER17 is displayed?
You should not continue using the oven while ER17 is active. The fault means the oven is not heating correctly, so food may not cook to a safe internal temperature. Additionally, the underlying electrical fault that caused the error could worsen with continued use. Stop using the oven and arrange for a diagnostic inspection before operating it again.
How much will it cost to repair an Ariston oven showing ER17?
Repair costs vary depending on the faulty component. If only a wiring connection needs attention, costs may be relatively low, covering a service call and labor. Replacing a heating element or temperature sensor typically falls in a moderate range for parts and labor. A power supply board replacement is generally the most expensive repair for this fault. Expect total costs to range from around $80 to $350 or more depending on your location and the specific parts required.

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