I replaced the Honeywell valve with the SIT valve (LP) on my Stardance SDV30. The pilot comes right on (without having to hold the knob in) but I cannot get the main burner to light. If I do hold in the knob in, in pilot mode, however, then the main burner lights up. When I release the knob the burner goes out and the pilot stays on. Please advise. Thank you.