The ornamental design for heater control panel buttons and switches, as shown and described.
FIG. 1 is a right front perspective view of heater control panel buttons and switches showing our new design;
FIG. 2 is a left front perspective view thereof;
FIG. 3 is a front perspective view thereof; and,
FIG. 4 is a top perspective view thereof.
The broken line disclosure showing the outline of the control panel, the heater housing, power cord and plug are for illustrative purposes and form no part of the claimed design.