mypros+
Error code reference

Electrolux Oven Error Code Htd

Drain temperature above safety limit (NM8)

Electrolux codesElectrolux oven codes

Drain temperature above safety limit (NM8) - stops machine, activates at 115°C. Possible lack of water in the drain system.

First step from the service manual

Try to fill manually (with a jug) some water into the drain syphon to refill the pipe and cool down NM8 probe.

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

MyPros+ Max

Get the full diagnostic procedure for Htd.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What Htd means on a Electrolux oven

The Htd error code on an Electrolux oven indicates that the drain temperature has exceeded the safety threshold of 115 degrees Celsius, as measured by the NM8 temperature probe located in the drain system. When this limit is reached, the machine halts operation automatically to prevent damage to drain components and connected plumbing. The NM8 probe is a dedicated safety sensor that monitors thermal conditions specifically in the drain pathway, separate from the oven cavity sensors.

The most common root cause is a lack of water in the drain syphon. Under normal operating conditions, water present in the drain trap and syphon acts as a thermal buffer, keeping the NM8 probe within safe operating range. If that water evaporates, drains away, or was never introduced into the system, the probe is exposed to elevated ambient temperatures without the cooling effect of liquid, triggering the Htd fault.

This condition can arise after extended periods of non-use, following a previous incomplete drain cycle, or if the syphon trap was inadvertently left dry during installation or servicing. The primary diagnostic step is straightforward: manually pour water into the drain syphon using a jug to refill the pipe, which reintroduces the necessary liquid barrier and allows the NM8 probe to cool down. If the error persists after the syphon is refilled and the unit is allowed to cool, further investigation of the NM8 probe itself, associated wiring, or the drain assembly is warranted.

Source: manufacturer service documentation.

Common causes of Htd

  1. 01

    Dry drain syphon or trap

    Wiring / connection

    The drain syphon has lost its water seal, leaving the NM8 probe without the thermal buffer it needs to stay below 115 degrees Celsius. This is the most frequent cause and can be confirmed visually by inspecting the syphon for standing water.

  2. 02

    Extended period of non-use

    Wiring / connection

    When the oven sits idle for a long time, water in the drain trap can evaporate completely. Refilling the syphon with a jug of water typically resolves the fault in this scenario.

  3. 03

    Incomplete or failed previous drain cycle

    Wiring / connection

    A drain cycle that did not complete properly may have left the syphon empty rather than replenished. Check whether the drain cycle runs to completion and that water is circulating through the system as expected.

  4. 04

    Faulty NM8 temperature probe

    Part replacement

    If the syphon is confirmed to contain water and the error persists after the unit cools, the NM8 probe itself may be providing an inaccurate reading due to a failed sensor element or damaged wiring. The probe and its connections would need to be tested and replaced if defective.

  5. 05

    Blocked or restricted drain assembly

    Wiring / connection

    A blockage in the drain pathway can prevent water from reaching or staying in the syphon area, causing the probe to overheat repeatedly. Inspect the drain assembly for debris, scale buildup, or kinks in drain tubing.

See the test procedure for each cause

Frequently asked questions about Htd

What does Htd mean on a Electrolux oven?
The Htd code means the drain temperature sensor, designated NM8, has detected a temperature above the 115 degree Celsius safety limit in the drain system. The oven shuts down automatically when this threshold is reached to protect components. The most common reason is that the drain syphon has run dry, removing the water that normally keeps the probe cool. Refilling the drain syphon with water from a jug is the recommended first diagnostic step.
How do I fix the Htd error on my Electrolux oven?
Start by carefully pouring water into the drain syphon to refill the pipe and allow the NM8 probe to cool down. Once the syphon has water in it and the oven has had time to cool, attempt to restart the unit. If the Htd fault returns after the syphon is confirmed full of water, inspect the drain assembly for blockages and test the NM8 probe and its wiring for faults.
Is it safe to keep using the oven when the Htd code is showing?
No. The Htd code causes the oven to stop operation automatically precisely because continuing to run with drain temperatures above 115 degrees Celsius poses a risk of damage to drain components and plumbing. Do not attempt to bypass the fault or force the machine to continue operating until the underlying cause has been identified and corrected.
Will resetting the oven clear the Htd error code?
A simple power reset may temporarily clear the display, but the Htd code will return if the underlying condition, typically a dry syphon or a faulty NM8 probe, has not been addressed. You should refill the drain syphon with water and allow the probe to cool before resetting the unit to give the reset the best chance of holding.
How much does it cost to repair an Electrolux oven showing the Htd code?
If the issue is only a dry syphon, there is no parts cost at all, just the time to add water to the drain trap. If the NM8 drain temperature probe has failed and needs replacement, repair costs including parts and labor typically range from around $100 to $300 depending on parts availability and local labor rates. A service call alone to diagnose the fault generally runs between $75 and $150.

Related Electrolux oven codes

All Electrolux oven codes
View all 186 Electrolux oven codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass