Heats for a while the makes a noise and stops heating
Dryer heats up then after about a half hour it goes cold. It also makes a rattleing noise when the igniter comes on. At that point the gas valve must not be opening because the is no flame. Could this be the gas valve or something else. please help
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Re: heats for a while the makes a noise and stops heating
You don't provide me with a brand, or model number, so I can only give you limited information. Fortunately, most gas dryers have common similarities in this regionIf your ignitor is coming on and no gas is being emitted, then you most likely have a gas valve solenoid failure. Below is a link to a parts breakdown with imagery and installation help. Item# 3479
Always make sure the power and gas is off before servcing! http://www.repairclinic.com/SmartSearch/smartsearch.aspx
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This could be condensation coming from the coil or expansion valve closing because heat load has been reduced after half an hour causing the liquid refrigerant going through the coil to make a bit of a noise check gas charge to be correct this also is a common cause
Check the heat shields on the exhaust system. They get loose from the
extreme heat fluctuations work loose and rattle. Especially the one
between the engine and firewall where the 02 sensor screws in. It
probably rattles less after warm up because heat causes expansion which
makes it tighter. Hope this helps.
If this is a gas dryer, you probably have bad valve coils, they can work intermittently, usually for the first part of a cycle, but when they heat up the internal resistance gets too high and they fail to open the gas valve. Once they cool off, (by continuing to air dry) they will work again for a few minutes. They will also make a buzzing/rattling (maybe "metal" ) noise as voltage is applied. For any Kenmore gas dryer, get part #279834 it contains both valve coils. Very easy to replace. Another possibility is that your duct work is plugged, check airflow. Hope this helps.