Warning: Disconnect power before servicing.
ErrBase

Gas Oven Not Heating Up Enough: Troubleshooting and Fixes

Quick Answer

If your gas oven is struggling to reach temperature, the most likely culprit is a weak igniter that isn't pulling enough Amps to keep the gas valve open consistently. You should first check if the igniter glows bright orange for more than 90 seconds without the burner lighting, as this indicates it's failing even if it still glows.

I've seen hundreds of ovens that sort of heat up over fifteen years. This symptom usually means something hasn't died completely but it's failing under load. Ignore it and your gas valve goes next, which costs three times more. A weak igniter or drifting sensor will take down your whole evening at the worst possible time. Fix it now while it's still a cheap repair.

GenericOvenSeverity: moderateDifficulty: intermediate90% DIY Success
Time to Fix
45–90 min
Difficulty
intermediate
Parts Cost
$20 – $95
Tools Needed
Phillips #2 screwdriver, 1/4 inch nut driver

Gas Oven Not Heating Up Enough: Troubleshooting and Fixes

OK so here's the good news: diagnosing a low-heat issue is usually cheaper than people expect because it's almost never the control board. Most of the time you're looking at a fifty to eighty dollar part and an hour of your Saturday. It's all about checking the resistance of your sensors and the current draw of your igniter before you spend any real money.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Weakening glow bar igniter65%
Temperature sensor out of calibration15%
Blocked burner ports10%
Door gasket heat loss5%
Control board relay failure5%

Symptoms You May Notice

  • You set it to 350 and after 25 minutes an oven thermometer is only reading 275. It just never gets there.
  • Food comes out consistently undercooked, cookies raw in the middle, or the bottom of a frozen pizza still doughy after the full bake time even when you follow the recipe exactly.
  • The bake burner flame looks small and lazy, almost like a pilot light, instead of the steady blue flame that should be rolling across the whole burner tube.
  • A brief whiff of gas right before it finally lights, or sometimes a soft thump when the flame catches after a longer-than-normal delay.
  • The oven temperature bounces 40 or 50 degrees up and down during a bake cycle when you watch it with a separate oven thermometer sitting on the rack.

Tools Required for Diagnosis

Phillips #2 screwdriver1/4 inch nut driverDigital multimeter (set to ohms and AC voltage)Flashlight or headlampWork glovesOven thermometer (for post-repair testing)Stiff wire brush or sewing needle (for burner port cleaning)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test
Expected Range1050–1100 ohms
ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Oven Igniter (Glow Bar)Universal/Brand Specific · $35–$95
Oven Temperature Sensor316233903 · $20–$50

Frequently Asked Questions

How long should a gas oven take to preheat to 350 degrees?
Honestly, a healthy gas oven should hit 350 in about 12 to 15 minutes. Some newer ones do it in under 10. If you're sitting there waiting 20, 25 minutes and it's still not there, something's wrong. Nine times out of ten it's the igniter or the temp sensor starting to fail. Grab a cheap oven thermometer for like $8 and put it on the rack so you know what you're actually dealing with instead of guessing. Don't just trust the display, it only knows what the sensor tells it.
Why does my oven igniter glow but the burner doesn't light?
So the igniter does two jobs. It physically heats up enough to ignite the gas, but it also has to draw enough current to electronically trigger the safety gas valve to open. As they age, igniters can still glow orange but they lose the ability to pull that full 3.2 to 3.6 amps. The valve stays shut, no gas, no flame. It's not broken in the traditional sense but it's definitely not doing its full job anymore. Replace it and you'll probably be surprised how much faster the oven heats up.
Can I calibrate my oven if it's just a little bit off?
Yeah, most digital control boards let you offset the temperature by plus or minus 35 degrees. Check your owner's manual for the button sequence because it varies by brand and model. Usually you hold the bake button for 5 or 6 seconds until something shows on the display. But here's the thing: if your oven is off by more than 50 degrees, calibration is just a band-aid. The sensor is failing and it'll keep drifting. Just replace the sensor and you won't have to fiddle with calibration offsets at all.
Is it dangerous if my oven takes a long time to light?
Yeah, don't ignore this one. When the igniter is slow or weak, gas builds up in the cavity for a few seconds before it finally catches. When it does light you get a pop or a louder boom depending on how much accumulated. That's not just startling, it puts real stress on the door, hinges, and internal components. Enough of those over time and you'll end up with a warped door or cracked igniter bracket on top of everything else. Fix the igniter before it gets to that point.
How much does it cost to replace a gas oven igniter yourself?
The igniter itself runs $25 to $60 depending on the brand. It's honestly one of the better DIY repairs out there because it's usually just two screws and a wire connector. Total job is maybe 30 minutes if you've never done it before. The only real catch is getting the right part number for your specific model. Look up your model number (it's usually on a sticker inside the door frame), match it exactly, and don't just grab the cheapest generic one. Wrong igniter means wrong amperage draw and you'll have the same exact problem all over again.

Same Fix on Other Brands

Ge ovenLOW-HEAT: GE Gas Oven Not Heating Up Enough

Models Known to Experience NOT-HEATING-ENOUGH Errors

This repair applies to most Generic ovens with this error code. Common model numbers include:

NX58H5600SS, FGGH3047VF, JGB735SPSS, WFG505M0BS, LRG3193ST, MGR6600FZ, JGBS66REKSS

MS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on May 20, 2024