The range timer is usually located in the control panel on top of the range. If you suspect the timer is faulty, don't try to fix it yourself. Remove it and take it to a professional service person for testing. Here's how to remove the timer:
Step 1: Remove the back service panel to the control panel and release the spring clips that hold it in position, or remove the retaining screws.
Step 2: Push the timer forward to release it.
Step 3: Remove the electrical lead wires from the timer housing. If, when disassembling the timer, you notice that the electrical wire terminals look burned, remove these leads and buff the leads and the terminal points with fine steel wool. Burned and/or dirty terminals can cause the timer to malfunction, but a good cleaning can solve this problem.
Step 4: Replace the old timer or install a new one of the same size and type, if this is necessary. Connect the new timer the same way the old one was connected.
The flame color on a gas range burner can give you a clue if any burner troubles exist. In the next section, learn what those clues mean and what to do about them.