A friend of mine is having trouble with their Wolf GDI-30N insert, and asked me to help since I am more mechanically inclined. The pilot stays lit, and has a proper flame pattern, but the main burner will no longer light at all (they said it used to light after 10-20 seconds). I've cleaned the thermopile, and get a reading of 730 volts. I tested the main valve, and am getting 2.3ohms. Both of those readings are within spec. There is no wall switch. Could the on/off/adjustment dial on the main control valve be bad, and can they be replaced separately from the whole valve? Any thoughts or advice would be appreciated.