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Is it the actual knob that is broken or the little tab the knob holds onto that is broken. You either need a replacement knob or a replacement switch assuming the know is also the thermostat for the unit. Does that same knob control the fan speed? Temprature or timer?
Hi Neil, I think I've sat down for several hours trying to work out how best to fit the spring in so it actually works.It's really difficult and I suppose the factory has a machine that does it and I think it's possibly the hardest thing on the whole unit to get right. I've looked at Youtube and there isn't a specific fix to this problem. Firstly,holding the knob in your hand, the spring sits in the knob with the smallest prong of the spring placed in a "V" shape mold which is thicker plastic than the other protusions. I've tried the other suggestions from forums to no avail, so where I'm at now is I know that the thick jutty out bit on the side wall that's got metal over it and the longest prong of the spring, both get positioned in between the two plastic fins on the other round part ( not the knob) on the machine. I drilled a small hole in the outside wall of the knob closish ( I sometimes use words you won't find in a dictionary but you get the gist) to that thick protusion with the metal on it. That's for a small screw driver to keep the longer spring prong close the thick bit on the side wall. Using a finger to push/ lever the long prong around then stick the screw driver in to keep it there.Problem is that when I do this , the small prong of the spring comes out. Maybe if I silicone the small prong in place and leave it for a day ,that might secure it for the time needed or rig up something to hold the short prong in place. I just think that if I can get to that stage , I'll be able put the knob on / screw in the screw and pull out the screw driver then tighten up the final turns of the screw. This method might sound unorthodox but if it works, problem solved with only a small hole left in the knob
Re-assemble the knob in the high range of the warm position, about 180 degrees from the "OFF" position. Install the long prong of the spring inwards (away from you as you look at the knob). That prong has to go in between the metal stop bar (again, about 180 degrees from "OFF") and a ridge on the inner knob. You should be able to reinstall everything while the spring is loose in this position. The only time you'll feel spring tension is if you rotate the knob counterclockwise towards "HOT". You won't feel any spring tension as you rotate the know clockwise back towards "OFF".
I figured it out after a fresh start in about 5 minutes.