To replace a heating coil in a dryer, power off the dryer, remove the control panel and open the bottom panel to expose the gas valves. The retaining plate should be removed and the sensors unplugged to pull out the coils and insert new coils on the gas valves.
A dryer needs to be disassembled before any repairs can be performed. Although dryers differ in construction, most panels can be removed by removing the screws in the corner and lifting off the top and bottom panels. A spring catch may need to be released by putting a putty knife in the open slot to remove the bottom panel and the filter.
Troubleshooting problems with the coils or heating element involves testing systems within the dryer. For example, if a dryer doesn't heat, the thermal fuse or radiant sensor may need to be checked. The radiant sensor monitors the progress of the igniter and provides power to the gas valve coils. If the sensor is malfunctioning, the dryer does not heat, which may indicate it needs to be repaired instead of replacing the coils. When the radiant sensor and the igniter are both operational, it typically indicates that the gas valve coils are faulty and need to be replaced.