We have a gas dryer model # lgr4634jq1.once we set the dryer to a cycle,the knob does not move through that cycle and the dryer will run continually. the only setting that runs is the timed cycle but it does not heat (the dryer does not heat 90% of the time no matter what cycle it is set to). We checked the lint trap and it is clean. We have replaced the vent hose with hard flex pipe with 2 metal 90 degree hard pipe so there is no possible way that the hose is getting kinked. We vacumed out the exhaust on the back of the dryer. 10% of the time the igniter will light but it is so random that we are not sure what the problem is.
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the timer : if you use time dry the timer should always move and complete the cycle. if you use auto dry the timer uses a sensor to tell the timer to move. If your not getting any heat your sensor might not tell the timer to move.
So lets start with the no heat problem. First make sure your Vent is clear or just disconnect the vent and put a pair of womans stocking over the end to keep the dust down, This will ensure you do not have a blocked vent. ((( If you have a blocked vent on a gas dryer the safty sensor will shut off the gas valve and you will only get a little bit of heat))) Now try the dryer for small load, ((( if this solved your problem then you have a cloged vent )))
If this did not solve your problem then the coils on your gas valve in the dryer are probably bad.
Fuse is ok . Problem is the soils on the burner valve . If the dryer heats when started , the electricity goes thru the coils to open the valve . Once the coils get warm , 1 will open (short) until it cools back down . The coils can be replaced just by removing the front panel . Only 2 screws hold the coils in place . No turning off gas , dissasembling dryer .
Check the switch on the motor. It may have failed, or has a wire/terminal broken/disconnected. It is a multi-contact switch. both sections must click. Could also be mechanically loose on the motor and therefore just not getting fully activated.
Maybe I can give you a few ideas on some things to check. As a general rule of thumb, to get maximum support here at Fixya, you should always include the brand and model of your appliance.. That helps us to tailor responses to your specific problem.. Anyway, regardless of dryer model, they all pretty much operate in the same basic manner and that is.. there is a heat source ( electric dryers use an heating element similar to an electric stove) A gas dryer is essentially the same but uses gas with an igniter to create a flame on a burner..) Outcome is the same.. Heat
Once heat is established, you need to move the clothes and the air thru the dryer compartment to optimize the drying efficiency. Both gas and electric models use a blower to move that heated air thru the compartment and out thru your vent system. If anything restricts air movement ( lint, blockage or any restriction in the blower or filter) your drying efficiency drops way down and dry times go way up. So. now you have the basics on how a drywer works.. Having said that... you need to check the basics first.. Make certain that you dryer exhaust system has NO restrictions to air flow.. you may have to detach vent line and check it for lint or anything in there.. If you have an electric dryer.. you can turn it on for a minute or two with the vent linbe disconnected to see if you are getting robust air movement.. If you aren't , then your problem is internal to the dryer, If you are.. you may have an exhaust duct restriction. Although not recommended, you can do the same for a gas dryer in a well ventilated area just to check the flow intensity.. But.. only for a short time since the gas burn byproduct is unhealthy for you to breath. I forgot to mention that the drum inside the dryuer should be moving the clothes during all this.. that acellerates the dry cycle too. Lastly, you need to make sure you are getting heat.. You can start a dry cycle with the dryer empty to see how warm it gets.. It should get fairly warm. Not sure I helped you but you now have a few things you can try. If you continue to have problems with this, feel free to contact me via this forum but please include the model number of your LG appliance..