My oven has the following problems:
1. oven lights stay on and can't turn them off with light on/off button on the control panel (I heard the double beep sound when pressing the light on/off button)
2. gas burners on the top work fine
3. control panel seems to be working fine
4. trying to turn the oven on, it seems it turns on - the control panel shows the temp 'preheating', the fan starts, but there's no heat coming out.
5. Oven door cannot be locked.
I would appreciate somebody can advice.