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Bad igniter? When you 1st try it the gas valve will give enough gas that you would get the burner lit if the igniter was glowing red. If you're desperate you can light the igniter area w/ an aim n flame, but you definitely want to do that w/ caution and crank up your t-stat so the furnace stays on awhile Cuz you'll have to do it again for heat or buy an igniter($40 or so)
If it's a direct spark ignition type heater maybe that's how it's designed to.work .When called for heat pilot open allowing gas then ignitor spark and ignite the pilot then gas valve open and allow gas through burner then unit fires off . Once temp is met pilot valve closes and pilot out .
This symptom indicates something wrong with the millivolt system. Start by checking the wires from the thermopile to the gas valve, insuring they are all tight and in place. Check the hi limit thermostat, if you have an ohm meter it should read .1 or .2 across it. With you meter set to dc millivolts, and flame present on the pilot, read across the thermocouple wires (red and white) to see the millivolts generated, with the thermostat off and the gas valve in pilot position you should get approx 600 millivolt plus minus 50. The pilot will have to be on for a minute or so to get maximum millivolts. If the millivolts are correct, hi-limit closed, and all wiring is connected, you likely have a faulty gas valve. If the hi limit reads more than .1 or .2 replace the limit, if you are not getting the millivolts from the thermopile, replace it.
Access
the burners inside your oven by removing the access panel in the front
of the oven or by opening the broiling drawer, depending on your
particular model.
Determine
if the pilot itself is lit, since some ovens have a small flame on the
pilot at all times that then grows and extends to the burner when the
oven is turned on. The lack of a pilot flame indicates the oven
thermostat is malfunctioning or there is a problem with the gas hose.
Check the pilot itself to see if it is clogged with debris or grease
that could be preventing the flame from staying lit.
Determine
if the pilot flame will grow if it is lit by turning on the thermostat.
If the pilot flame doesn't extend, the thermostat itself likely needs
replacement. If the flame is extending but the gas valve is not
opening, the safety valve could be dirty or defective. The flame should
be blue in color. A yellow flame indicates the pilot is dirty and is
not burning hot enough to get the main burner to ignite.
Light
the burner on the top of the oven with a match if the igniter doesn't
appear to be effective. If it lights manually but will not light
automatically, the igniter is likely faulty. Do not do this if there is
a heavy smell of gas in the kitchen, since there could be a risk of a
fire. In that circumstance, turn the oven off, ventilate the room and
call a technician.
Listen
for any sounds of gas hissing or a clicking sound indicating the oven
is trying to turn on. If there is no response from the oven at all, the
gas may not be functioning properly and will need to be examined by a
technician for safety purposes
Sounds like an intermittent thermostat problem. You must make sure the millivolts are high enough or the thermostat can call for heat but the gas valve won't open. You must have over 200 millivolts reading when the thermostat is calling for heat. If the millivolts are good....replace the thermostat.
Tom
The thermocoupler is no good. It's that bulb sitting in the pilot flame. when it goes out it shuts everything doen in the main valve. It has to be kept hot by the pilot, that's how it know whether or not it is safe to open the main .
Often times you will have problems with the gas thermostat and not necessarily with the safety valve. Once you have lit the pilot light, turn the oven knob to any temperature. The pilot light should get bigger in size of flame. If not, the thermostat that controls the oven must be replaced. If the pilot light does get bigger, but the stove does not ignite, it is the safety valve.
You need to check a couple of things, first is the flame sensor, second is the thermostat. Without anymore detailed info this is the most I can give you.
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