how does a oven thermostat of a gas range control the oven temprature?

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Old 08-28-11, 11:22 AM
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Smile how does a oven thermostat of a gas range control the oven temprature?

gas range (constant pilot)

possible answers :

reduced the flow of gas and maintain a minimum flame?

stops gas flow and shuts of constant

stops gas flow to the oven safety valve which reduces the size of heater pilot to that of the constant pilot. cooling the capilary bulb, and shutting off the gas to the main burner.

reduced size of constant pilot and stops gas flow to burner.
 
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Old 08-28-11, 11:25 AM
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Cool the oven burner will not light when the oven thermostat is turned up to 350 F.

pilot is lit, and when the oven thermostat is turned up constant pilot light, it increases to become the heater pilot, but nothing else happens. what could be the problem?

possible answers:

is the thermostat faulty?
is the oven pilot too small and needs to be increased?
is the oven safety valve faulty?
is the oven thermostat control out of calibration
 
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Old 08-28-11, 11:38 AM
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I moved these posts to the appropriate Forum Topic.
 
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Old 08-28-11, 12:26 PM
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thanks , and where would that be?
 
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Old 08-28-11, 12:39 PM
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Where you currently are....Gas Appliances....
 
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Old 08-28-11, 04:50 PM
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Originally Posted by mehran91 View Post
pilot is lit, and when the oven thermostat is turned up constant pilot light, it increases to become the heater pilot, but nothing else happens. what could be the problem?

possible answers:

is the thermostat faulty?
is the oven pilot too small and needs to be increased?
is the oven safety valve faulty?
is the oven thermostat control out of calibration
Typically with a "heater" type pilot, the flame is to small to heat the cap tube properly. A good test: Hold a couple of matches with a needle nose pliers and apply that flame to the cap tube. Remember the tstat must be calling for heat. If the burner does come on then the pilot is the problem. The other 3 issues you list are seldom the problem. Of course that doesn't mean they can't be.
 
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Old 08-28-11, 07:55 PM
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thanks mbk.
so do you think thermostat is fauly? or the oven safety valve is faulty?
also. do you know the temprature sensing element used in an oven thermostat?
 
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Old 08-29-11, 04:29 AM
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Hello: mehran91

Several assumptions are being made here and have to be made because you're not providing enough details nor specific information. Be best to help us so we can help you.

Brand and model numbers would be very helpful. As well as appliance age.

There are several types of pilots in older model stoves with constant burning pilot flames. Some the constant pilot enlarges. Others the constant pilot lights another much larger pilot flame which points slightly downward.

Yet another type is horizontal about one and a quarter inches long with a safety element just above it. This type is known as a flame switch and is always being heated by the constant burning pilot flame.

Knowing exactly which type safety device your oven has greatly helps us provide the exact cause of the problem you're having. It also helps us if you explain in more details exactly what the problem is.

Possible problems. Dirty pilot flame. Defective safety element. Safety element has a vapor charge. When heated or hot, vapor increases internal pressure. Pressure pushes on a tiny pin which keeps the gas valve opened. Safety element becomes defective when internal pressure decreases or is lost as a result of years of service being heated.

Not as likely to be a thermostat problem.

Suggestions:
Retail parts dealers and appliances parts stores can also help determine what the possible problem may be based upon that specific brand and model. Bring the make, model and serial numbers. Dealers and appliances parts stores are listed in the phone book.

Additional Suggestions:
Read the manufacturers on line web site for product information, problem possibilities, causes, solving methods, part locations, disassembly, reassembly methods, repair procedures, pictorials, schematics, repair and or owners manuals which may be available on line.

Cautionary Reminder Note:
Before attempting any cleaning or repairs, be sure to unplug the appliance from the wall receptacle power source first.

Have you read they sticky note? Detailed information contained within it.

>>>Read The Sticky Advice And Information Note In This Topic: Range-Stove-Oven-Broiler Basic Help Information & Manufacturers Web Sites. Range/Stove/Oven/Broiler Info, Leak Detection, Fault Codes, Fuel Conversion & Links - DoItYourself.com Community Forums

Use the reply button to add additional information or questions. Using the reply button keeps or moves the topic back up to the top of the list automatically and keeps all communications on this subject in this thread.
 
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Old 08-29-11, 09:54 AM
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I think before you go any farther do as I suggested. Sharp advice makes a good point of the various pilot safety systems. However, as you described it I will make an assumption it is a 2 stage hydraulic system. Take one step at a time and don't over think this. Best wishes
 
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