What would cause a gas dryer not to dry includes heating, airflow, and gas supply issues. For Samsung gas dryer and other brands, most common cause is no gas supply, check gas valve fully open, gas line not kinked, and other gas appliances working. Second is failed igniter, gas dryer igniter glows to light gas, if igniter cracked or burned out dryer will not heat, replacement part DC47-00014 costs $30. Third is failed gas valve coils, coils open gas valve after igniter glows, if weak dryer will not heat, coils cost $20. Fourth is thermal fuse blown due to overheating from clogged vent, dryer will not heat if fuse blown, replace fuse and clean vent. Fifth is clogged lint filter and vent duct, blocked airflow causes overheating and poor drying, clean filter after each load and vent yearly. Sixth is flame sensor faulty, sensor detects flame, if fails gas shuts off. Seventh is moisture sensor dirty with softener residue causing early shut off, wipe sensors with alcohol. Eighth is overloaded or clothes too wet from washer. Troubleshooting steps, check gas supply, clean vent, check igniter glow, test flame sensor, replace coils if needed.
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