Direct answer
For the Samsung Flex Duo NX60T8751 gas range, mode, temperature, door state, power/gas supply and element/burner operation should be separated. First, select Bake at a moderate temperature and observe ignition or element behavior.
What this covers
- Samsung Flex Duo NX60T8751 gas range (NX60T8751S*)
- Samsung range/oven; gas, electric, induction, Flex Duo and SmartThings equipment vary.
- The specific fault this record addresses: oven will not heat or preheat
What it does not cover
- ×The same symptom on a different Samsung product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The bake or broil igniter has weakened
What separates it The igniter glows, sometimes for an unusually long time, but the oven never lights, or it lights inconsistently — an igniter has to reach a specific resistance/current draw to trip the gas safety valve open, and a weakening igniter can glow without ever reaching it.
How to confirm Time how long the igniter glows before either lighting or the control giving up — a normal ignition happens in a matter of seconds; a long glow with no ignition points squarely at the igniter.
- 2
No household power is reaching the oven's control or element circuit
What separates it Complete darkness on the display as well as no heat — this is a different symptom from a lit, functioning display that simply produces no heat.
How to confirm Check both poles of the range's breaker before assuming an internal fault; see the no-power symptom for the full path.
- 3
A Sabbath mode or a control lockout is suppressing normal operation
What separates it The display behaves unusually — showing a specific icon, refusing certain button combinations, or holding a fixed temperature regardless of setting.
How to confirm Check the manual for the exact icon and the documented sequence to exit that mode; it is not the same on every brand.
- 4
The oven safety thermostat or control board has failed
What separates it Confirmed power, confirmed intact element or a normally-glowing igniter, and still no heat — this is the conclusion only once supply and the primary heat-producing part are ruled out.
How to confirm This is a technician diagnosis reached after eliminating the more common causes above.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether this is a gas or electric oven — the igniter-and-valve sequence and the resistance-element behavior are different failure paths with different tells.
- Whether the display is fully dark (a power problem) or lit and responsive but simply not heating (a heat-path problem).
- For gas ovens: how long the igniter glows before the control gives up, if it glows at all.
- Any special mode icon showing on the display.
Confirm household power is present at both breaker poles
ReversibleRule out a power problem before diagnosing the heat path itself.
Select Bake at a moderate temperature and observe the first minute
ReversibleFor gas, time the igniter glow before ignition; for electric, watch for the element beginning to glow.
Check for and exit any Sabbath mode or control lockout
ReversibleUse the manual's exact sequence for this model.
Arrange service for a confirmed failed igniter, element, valve or control board
ReversibleThese are standard replacement parts but not typically safe DIY repairs given gas or high-voltage exposure.
Measure a full preheat cycle after correction
ReversibleConfirms the fix reaches and holds temperature, not just that heat is present momentarily.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- NX60T8751S*. Samsung range/oven; gas, electric, induction, Flex Duo and SmartThings equipment vary.
- Cooktop — GAS (igniter + flame)
- A GAS cooktop — burners click to ignite. A burner that clicks but will not light is usually a wet/misaligned cap or clogged ports; dry, clean and reseat it. No click means the igniter or power.
- Oven — Flex Duo (splits into two)
- Flex Duo with a removable Smart Divider that splits the oven into two independent zones. 'Only half heats' or 'zones at different temps' is usually the divider in place with each zone set separately — check the divider and Flex Duo mode.
- Features
- Convection, Air Fry on some, SmartThings Wi-Fi. Gas supply must be on.
- Symptom boundary
- This record covers Samsung Flex Duo NX60T8751 gas range when it oven will not heat or preheat. A different symptom on the same hardware, or this symptom on a different Samsung product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Gas odor at any point: stop, do not operate any switch, ventilate, leave and call the gas utility or emergency services from outside.
- !Repeated breaker trips, arcing, or a smell of burning insulation mean stop and call for service rather than continuing to test.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Samsung Support publishes this as "Samsung washing machine information and error codes". Samsung's own washer troubleshooting and error-code article; covers filling, draining, spin and unbalanced-load conditions. What that article does not carry is the model boundary — it is written for a product line, and NX60T8751S* is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
How does the Flex Duo oven work on my Samsung NX60T8751?+
Flex Duo lets one oven be used as a single large cavity or, with the Smart Divider inserted, as two separate ovens at different temperatures. So if only the top or bottom seems to heat, check whether the divider is installed and Flex Duo mode is selected — each zone then runs independently. Remove the divider and pick the full-oven mode to bake one large item across the whole cavity.
My gas oven's igniter glows but nothing lights.+
An igniter has to reach a specific resistance to trip the gas safety valve open — a weakening igniter can glow, sometimes for a long time, without ever reaching that point. Time how long it glows before giving up; a normal ignition happens within seconds, so a long glow with no ignition points at the igniter.
My electric oven shows no error but never gets hot.+
Check whether the bake element visibly glows within the first minute of a Bake call, with power confirmed present. An element that stays completely dark despite a call for heat points to the element or its control relay, not the thermostat.
Does this answer apply to every Samsung model?+
No. It is scoped to NX60T8751S*. Samsung range/oven; gas, electric, induction, Flex Duo and SmartThings equipment vary.
What should I record before troubleshooting oven not heating or preheat?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing oven not heating, preheat. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for gas odor, arcing, smoke, runaway heat or repeated breaker trips.
Answer for the exact device and software version shown above.