Only 2 wires connected to current switch grey and white yet three wires present all have colored thread 1 white 1 red 1 either grey or blue tried all different ways only seem to get the pilot to light no burner or fan coming on

Old switch is honeywell new switch has OB/W2_R_W1_C_G_Y
Done white to W red to R only pilot tried grey to R white to W only pilot again left grey and white and put red
In C then G still only pilot lighting