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Gas Range Diagnostic Chart   Date: Wednesday 07 February, 2007
Gas Range Diagnostic Chart
Gas Range Diagnostic Chart
Symptom Solution
Flame blows away from burners
  • Check air shutters to burners
  • Check for draft near burners
  • Too much gas to burners
Gas Smell
  • Check all gas valves, thermostatic gas valves and over safety valves for leaks with soap bubbles
  • Check all pipe joints and fittings with soap bubbles
  • Check for pilot light out on burners
  • Check for too much gas going to burners
Oven burner will not light
  • Check clock for proper settings. Should be set to manual operation See Picture Below
  • Check flame switch (if equipped)
  • Check for pilot flame being out
  • Check gas pressure
  • Check glow igniter (if equipped)
  • Check power cord to wall
  • Check spark module (if equipped)
  • Check thermostat
  • For glow bar models, check voltage at safety valve and compare with imprint on valve. Some models are 2.8 to 3.1 and others are 3.2 to 3.5 volts. The voltage should be printed on the side or top of the gas valve.
Oven too hot
  • Burner could be getting too much gas
  • Pilot light set too high in oven
  • Thermostat could be out of calibration
  • Oven Safety Valve not shutting off when no voltage to valve or no call for heat - Replace Safety Valve
Uneven cooking - Food burns on one side, but not done on the other
  • Check burner for partial burning
  • Check level of oven
  • Check oven door gasket
  • Make sure pans are located properly in oven middle

 

 

Electronic Ignition Gas Ranges 
Electronic Ignition Gas Range
Images Shown Inside Oven Bottom Removed 

My GAS range oven will not light. The glow bar (igniter) is glowing, but it will not light..

You either have a bad igniter (glow bar) or a bad safety valve. Yes, the glow bar can be bad and still glow. It must pull a predetermined amount of current in order for the safety valve to open. On a tag on the safety valve there should be an AMP or AMPERAGE or CURRENT rating, usually something like 3.2 amps. This is the amount of amperage that the glow bar must pull in order to be good. You will need a clamp-on amp meter to test the amperage draw of the glow bar. Clamp the meter around either of the 2 lead wires at the back of the glow bar and turn on the thermostat. Observe the amp draw. If it is within 2 percent of the listed rating on the safety valve, the glow bar is good and you should replace the safety valve. If the amp rating is not within 2 percent of the listed rating, replace the glow bar.

Another way to check this is using a voltage meter, check the voltage to the safety valve. Some models (round style igniters) are 2.8 to 3.1 and others (flat style igniters)  are 3.2 to 3.5 volts. The voltage should be printed on the side or top of the gas valve.

Note: I've replaced hundreds of igniters and only 2 oven safety valves in the past 10 years. You can also ohm out the safety valve. If it ohms good (has continuity) it is ok and you should replace the igniter. If you have to guess, replace the igniter.

Note : These igniters are made of a material that is extremely fragile. If you touch the dark gray part of the igniter or bump it against anything it will break.

Check the Current Draw on the valve-igniter system using an appropriate current measuring device. Low current usually means a weak igniter. Do not replace the valve in low current situations. Replace the igniter.
Another way to do this is using a voltage meter, check the voltage to the safety valve. Some models (round style igniters) are 2.8 to 3.1 and others (flat style igniters)  are 3.2 to 3.5 volts. The voltage should be printed on the side or top of the gas valve.
Oven wont come on? Make sure the clock is set for "Manual" CookingClick images to enlarge

range_clock.jpg (62969 bytes)

Image Shown - Newer Range Componentsglowigniter.jpg (71130 bytes)
Image Shown - Older Range Componentsgasrangeselect1.jpg (74802 bytes)
Some gas ranges use a flame switch. When the pilot is lit and the thermocouple that goes to the flame switch is red hot, the flame switch should have continuity. You can check this using an ohm meter.

 

gas_range_flame_switch.jpg (98901 bytes)
Image Shown - Gas Range top components

Top Burners won't light ? No Clicking sound -   Check burner switches & spark ignition module

Switches should have continuity 

Ignition Module - See below

 

gasrangeselect2.jpg (91791 bytes)
Image Shown - Spark Ignition Module 

Ignition Module - Check for 110 volts in if 110 in and no output ( no spark or click ) Replace Spark Module

If Maytag Gas Cooking Product or Magic Chef etc and two burners spark an two do not , suspect Spark Module - Have seen this problem quite often.

Note : Anytime you turn one of the burners on,  ALL OF THEM SHOULD SPARK.  - This is due to the burner ignition switches are wired in series. This is normal

gasrangeselect3.jpg (87079 bytes)
Popular Frigidare Ignition Module frigidaremod.jpg (51051 bytes)
Popular Maytag / Magic Chef Ignition Module

Maytag / Admiral Magic Chef / Norge  Ranges/ Cooktops have seen failures in this module - Symptoms - Two burners won't ignite / spark  . Other two work fine - If so replace module 

maymod.jpg (45343 bytes)
Converting a Electronic Ignition Range to LP 

First Step .... Check your Owners Manual to see if your range requires a orifice kit to convert it.  If so follow the instructions in kit or in owners manual. Some Ranges come from the factory with the orifices for LP, if so you'll find them in with owners manual.

 

  1. Flip cap on regulator or remove cap and flip piece under cap to LP It should be marked
  2. Turn gas to each top burner down via burner valve adjustment nut Turn until yellow tips on burner go away and you have a nice blue flame
  3. Remove broiler pan and adjust oven burner via nut on safety valve - again adjust burner until the the yellow goes away and you have a nice blue flame. 

 

  

  

 Standing Pilot Ranges 

Older Standing Pilot Gas Range
Images Shown Inside Oven Bottom Removed 

My GAS STOVE oven will not light. The oven pilot light is lit.

  • Since your oven pilot light will light, your problem will be either the oven thermostat, pilot assembly or the oven safety valve. Get down and look at the pilot light while you have someone turn on the oven thermostat. If the thermostat is working properly, you will see the flame on the pilot light get a little bit bigger when the thermostat is turned on. If it does get bigger, then the thermostat is working fine. If the flame does not get bigger on the pilot light when the oven thermostat is turned on, replace the thermostat.

  • Next check to see that it is heating up the safety valve thermocouple hot enough. If not replace the pilot assembly.

  •   If all of that is ok replace the oven safety valve.

 

Image Shown - Oven Thermostat in the Off Position or Oven Thermostat Satisfied. (oven up to temp) 

Note : Do Not Take the Safety Valve apart. If you do, you will not be able to get it to Reseal and it will leak gas.

The Thermocouple comes as part of the Safety Valve and is not replaceable as a separate component. It is part of the Safety Valve

Click Images to Enlarge

gasrangestpilot1.jpg (149562 bytes)

Image Shown - Oven thermostat in the On position and calling for heat. 

Pilot jumps down (  thermostat increases gas to pilot assembly ) heats up thermocouple bulb from safety valve. 

Note : Should heat the bulb hot enough to tell safety Valve to let gas to burner. If not replace the Pilot Assembly

If Pilot jumps upwards or just gets bigger , doesn't shoot down, replace the Pilot Assembly. 

If pilot size does not increase or jump down when turning on oven thermostat,  problem is in thermostat not sending gas to the pilot assembly or possibly the pilot gas supply tube has a hole in it somewhere.

gasrangestpilot2.jpg (138721 bytes)
Image Shown - Safety Valve Bulb hot enough, Valve lets gas to burnergasrangestpilot3.jpg (131304 bytes)
Some gas ranges use a flame switch. When the pilot is lit and the thermocouple that goes to the flame switch is red hot, the flame switch should have continuity. You can check this using an ohm meter.

 

gas_range_flame_switch.jpg (98901 bytes)
Popular Oven Pilot Assembliespilotassemblies.jpg (46370 bytes)
Top Section Components

Top burners not lighting? 

Check / Clean with paper clip , the holes in the burners. Especially the ones by the flash tubes. Also check / Clean Pilots

gasrangestpilot4.jpg (240394 bytes)
Factory Set at Natural Gas . Turn to LP for Propanegasrangestpilot5.jpg (86391 bytes)
Factory Set at Natural Gas Unscrew Cap and  flip over for LPovenreg.jpg (66742 bytes)
Converting a Standing Pilot Range to LP 
  1. Flip cap on regulator or remove cap and flip piece under cap to LP It should be marked
  2. Turn oven pilot screw on thermostat to LP
  3. Turn gas to each top burner down via burner valve adjustment nut Turn until yellow tips on burner go away and you have a nice blue flame
  4. Adjust top pilots -  nice blue flame
  5. Remove broiler pan and adjust oven burner via nut on safety valve - again adjust burner until the the yellow goes away and you have a nice blue flame. 

 

 

 

 
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