Cooktop Medium Severity
E5 Appliance Error Code

Asko Cooktop E5 Error: Residual heat sensor fault

Asko cooktop E5 error is a common issue reported by Asko appliance owners. What Does Asko Cooktop Error Code E5 Mean? E5 indicates a fault with the sensor or circuit responsible for the residual heat (hot surface) indicator — the “H” symbol that warns users a zone is still hot after cooking. Although this seems […]

By Denys Mitchell Lead Appliance Repair Specialist & Technical Writer

No

DIY Fixable

From $170

Typical Repair Cost

45-90 min

Pro Repair Time

Quick Assessment

Answer to continue safely

Is it safe to keep using?

Maybe. Other zones with functional residual heat indicators can be used. The affected zone should be avoided, especially if the "H" warning no longer activates — treat it as always hot after use.

Can I reset the code?

Yes. A power reset may clear a transient E5 caused by moisture. A physically failed sensor will cause the code to return.

When to stop immediately?

Stop if you notice: Do not touch the glass surface of the affected zone after cooking — treat it as permanently hot until repaired., Stop using the zone if it refuses to activate (locked out due to false high-temperature reading)..

Symptoms You May Notice

Hot surface "H" indicator stays on permanently

The residual heat warning symbol for one zone remains lit even after the cooktop has been completely cold for several hours, indicating a false-hot reading from the sensor.

E5 displayed on zone or main panel

The zone or main display shows E5 after a cooking session or on initial power-up, indicating the sensor is reading a value outside normal range.

"H" indicator never activates after cooking

In the inverse failure the hot surface warning never appears even though the zone glass is genuinely hot — a safety concern as unsuspecting users may touch the hot surface.

Zone disabled despite glass being cold

The cooktop locks out a zone because the residual heat sensor is reporting a falsely high temperature, preventing normal cooking use of that zone.

Possible Causes

1

Failed residual heat sensor

The NTC thermistor measuring surface temperature for the residual heat display has drifted or failed, sending a signal below zero Ω or above maximum resistance.

Requires Professional
2

Liquid ingress to sensor area

Boil-over liquid seeping under the cooktop glass can contaminate the sensor bonding adhesive, causing erratic resistance readings and false E5 faults.

Requires Professional
3

Open-circuit sensor wiring

The thin wire pair from the sensor to the PCB has broken due to thermal fatigue or physical damage during installation, producing a permanent open-circuit reading.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Allow full cool-down and reset

    Ensure the cooktop is completely cold (wait 2 hours if recently used), then perform a 5-minute breaker reset. Check if the "H" indicator and E5 code persist on the cold cooktop.

    A residual heat indicator that is active on a demonstrably cold glass surface confirms a sensor fault rather than a genuine hot surface.

  2. 2

    Check for liquid ingress

    Inspect the cooktop surface around the affected zone for signs of boil-over, staining at the edge seal, or moisture under the glass (visible as fogging or water marks). Clean the surface thoroughly and allow 24 hours for any residual moisture to dry out before retesting.

    Lift any silicone edge trim carefully and dry beneath it if liquid has pooled there — this is a common entry point for boil-overs.

  3. 3

    Test "H" on other zones

    Cook briefly on a different zone, then switch it off and observe whether the "H" indicator activates and eventually turns off as the glass cools. If the other zones display "H" normally, the fault is localised to the single zone sensor.

    This comparison test confirms whether the issue is isolated to one sensor or a system-wide PCB fault.

When to Call a Professional

Contact a qualified technician if:

  • E5 persists on a cold cooktop after a full cool-down and breaker reset.
  • The "H" indicator never activates after genuine cooking on the affected zone — immediate safety concern.
  • Visible moisture or fogging under the glass ceramic surface near the zone.

Need Professional Help?

Find qualified technicians in your area for proper diagnostics and repair.

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