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I have a 1972 Moblie home (Old) the pilot is on and the there is a switch you have to turn on to get the air to blow the automatic button does not work- If you turn it on it works but does not automatically shut off

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The fan/limit control (silver3x4 box cover pulls off has a dial behind cover with temp graduations) is prob.stuck or out of adjustment.

Posted on Jan 11, 2009

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Home owner's manual? Troubleshooting section. Gas or electric?
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It depends on what type of unit you have if it is gas or electric. If it is gas your pilot light is probably not lit .take the top door of your furnace off look under the burner and see if there is a small flame lit . if not it is simple to light turn the knob on the gas valve to pilot then push in on the know while holding a match at the pilot head to find the pilot head trace the small aluminuim pipe from the gas valve to where it ends that will be the pilot head once the pilot lights count to 10 slowly then switch the knob to the on position and your set make sure the t-stat is in the off position before lighting the pilot light.

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The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. If the pilot light has only a weak flame, the whoosh of the main burner igniting can quite often blow out the pilot. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.

The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If pilot flame goes out for any reason, it shuts the gas off to the pilot jet to prevent unburned gas collecting and causing a safety hazard. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced.

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The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.

The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced

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If your pilot looks a little weak chances are the pilot tube has a sight blockage in it. You will need to turn the gas off remove the pilot tube and get access to the opening of the tube and blow it out with your mouth air compressor or something. Reinstall pilot tube turn gas back on and re-try lighting the pilot. Now should look stronger and if it don't hold the thermocouple is bad and will need to replace it. You might be able to get one at Lowes or a hardware store like Ace Hardware. let me know what happens . ken

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