TENGO UN HORNO DE CONVECCION MARGA BLODGETT ZEPHIRE , MI PROBLEMA ES QUE EL PILOTO ENCIENDE PERO NO DURA MAS QUE UN MEDIO MINUTO Y SE APAGA, Y NO ENCIENDE LOS QUEMADORES TIENEN UNA IDEA DE CUAL SEA EL PROBLEMA
How about the full model number so that I know what ignition system you have. They used more than one design on that series oven.
Being you said a pilot, That means you probably have a Fenwal gas control with a spark lit pilot. If you are not a tech with the knowledge of how to use a DVOM, You would be best served by hiring one.
Why I say the gas control system? Well you say that it lights and then goes out. Most fenwals for blodgett have a 50 second delay looking for the flame current before locking out the pilot. If they see the current, they open the main valve. Simple as that.
How is the current generated? The control has 24 VAC that is sent out to the flame rod. this is insulated and does not touch anything but a flame when lit. The flame rectifies the electricity and a small amount goes to ground of the pilot burner on this machine. Sometimes main burners of others. The pilot is grounded to the controller. and the controller determines that there is a DC current to make a decision.
Guessing at replacement is costly. What one has to test is for the flame sensing current to the controller. This can be the pilot, flame rod, wiring, or burner grounding. Or a loss of power or signal to the gas controller. And on rare occasions the controller itself. We are talking mere 1 micro amps of DC current here, so knowledge and use of your meter is very important. And not all DVOM's have a micro scale. Your problem may be as simple as a dirty terminal or flame rod. Corroded ground wire connection, Or even a bad insulator or not in the flame properly.. Little things that a tech spots right away.
As Fixbear said, without a model and serial number, its hard to help. Having said that, I will guess. After the fan switch is proved there is a five second purge of the gas line. Spark is then initiated, the pilot lights. If the ignition module does not see the flame or "prove" the pilot is lit, the ignition module shuts off the gas to the pilot and goes into lock out. That's why you have to turn the oven off and back on again, to try to relight.
I would try to clean the flame rod or, better yet, replace the pilot and flame rod assy. As I said, without more info its just a wild guess.
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