Have Electrolux RM6270 and the problem is that it will not always fire up. I have taken it out and blew all pipes through and cleaned burner assy and today replaced the thermo coupling . It fired up first time and after turning it off and waiting a while tried again and this time it did not fire up afer releasing the knob. There is a good flame when holding in the knob but as i said it goes out again ,it seems the thermo is not speaking to the "valve"to release the gas if you know what i mean. Any help would be most appreciated.