If your dryer light is out, the usual suspects are the light socket first, then the control electronics, with the door switch and the light assembly less often to blame. Start simple: check the bulb and use a multimeter to see if voltage reaches the light socket; a dead socket or bad bulb is an easy fix. If the socket has power but the light still won’t come on, the indicator lights are tied into the control panel, touchpad, or user control and display board, so a faulty control assembly can stop the interior light and make it look like the dryer controls are not working. A defective door switch can also cut power to the light, and if it fails a replacement restores continuity. Less commonly the entire light assembly will need replacing. You can test the door switch with a meter and replace the exact part you need by entering your dryer model number at RepairClinic.com to find the correct replacement part for your machine.
01 - Whirlpool Dryer Light Socket
If the light itself is newly installed or shows no signs of damage, yet still won't work, it's possible the light socket is defective. You can use a multimeter to test whether or not voltage is reaching the light socket. If the meter shows that power is reaching the light socket then it's likely the socket is malfunctioning and will need to be replaced.
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The dryer control panel indicator lights are part of the control panel assembly and cannot be replaced separately. If an control panel indicator light is not working, the entire control panel assembly will need to be replaced.
The dryer control panel indicator lights are part of the touchpad and control panel and cannot be replaced separately. If an control panel indicator light is not working, the entire touchpad and control panel assembly will need to be replaced.
04 - Whirlpool Dryer User Control and Display Board
The dryer control panel indicator lights are part of the user control and display board and cannot be replaced separately. If an control panel indicator light is not working, the user control and display board will need to be replaced.
The dryer door switch will turn the interior light off when the door is closed and turn it back on when the door is opened. If the switch is defective, it may be unable to allow voltage to reach the light. You can use a multimeter to test the door switch for appropriate electrical continuity when actuated. If the switch doesn't provide appropriate continuity, it will need to be replaced.
The most likely cause of a dryer interior light not working is a defective light assembly. Inspect the assembly for any visible damage or burn marks and replace as required.