---
title: "A DCS Gas Oven That Will Not Heat: the Ignitor Test Nobody Does"
description: "A DCS gas oven not heating up is usually a weak ignitor, not a dead one. It glows convincingly and never draws enough current to open the gas valve."
url: "https://dcsmiami.support/blog/dcs-gas-oven-will-not-heat/"
date_modified: "2026-09-14"
Category: "Common Problems"
---


# A DCS Gas Oven That Will Not Heat: the Ignitor Test Nobody Does

Almost nobody measures the ignitor, because it is glowing and glowing looks like working. It is the reason this repair gets done twice.

## DCS gas oven not heating up: what the ignitor is actually for

On a gas oven the ignitor has two jobs and only one of them is visible. It gets hot enough to light the gas, which you can see. And it acts as a resistor in series with the safety valve, drawing current through it — which you cannot.

The valve is designed to open only when that current is high enough. It is a safety device: no glow, no current, no gas. What nobody expects is the middle state, where there is plenty of glow and not quite enough current.

## Why a weak ignitor is worse than a dead one

A dead ignitor is obvious. Nothing glows, nothing lights, and the part that has failed is the part everybody suspects.

A weak one performs. It comes on, it glows orange, it sits there for two minutes looking exactly like an ignitor doing its job, and the valve never opens. From in front of the oven the machine is clearly trying and clearly failing, which sends people towards the control, the thermostat, the board — everything except the component that is visibly working.

## The chain, and why every link looks the same

**The ignitor draws current.** Weak: no valve. Replace.

**The current reaches the valve.** A broken wire or a corroded connector between them produces a glowing ignitor and a closed valve, identically.

**The valve opens.** A failed valve with a perfectly healthy ignitor gives the same picture again.

**The gas arrives.** A supply problem upstream — rare on an indoor range but not impossible — closes the story the same way.

Four causes, one symptom, and no way to tell them apart by looking. Ten minutes with a meter separates them completely.

## The measurement itself

Current draw through the ignitor circuit while it is heating, taken at the harness rather than guessed from the glow. There is a threshold below which the valve will not open, and an ignitor reading under it is finished regardless of how bright it looks.

This is not owner work — it means the oven's supply is live while the harness is accessible — but it is worth knowing it exists, because it is the difference between one part and three.

## What we establish before any of it

Whether the oven is gas. On a dual fuel range the top is gas and the cavity is electric, and then the list is elements, sensor, thermal fuse and board rather than anything on this page.

It sounds like something an owner should obviously know, and in practice it is the detail people are least sure of — reasonably, because from the front of the range the two look identical.

## And the thing that is not the ignitor

An oven that heats but heats badly — slow, short of temperature, uneven — is a different page. That points at the door, the seal or a drifted sensor, and replacing an ignitor will change nothing at all.

If yours gets warm but never gets there, say so when you call. It saves us both a step.

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