FLAME ON WOK BURNER RANGEMASTER 90 KEEPS GOING OUT WHEN RELESING THE CONTROL KNOB IS THERE A SOLUTION TO THIS FAULT

SOURCE: RANGEMASTER 110 Cooker FLAME FAILURE DEVICE fitting

My progress to date (20090127):
1 Turn off the gas supply to the oven
2 Turn off the electricity supply
3 Remove the oven linings
4 Remove the storage drawer
5 Remove the three screws holding on the bottom trim and the trim
6 Crank up the front roller
7 Pull out the oven carefully making sure the gas hose and electrical lead are long enough and not caught
8 Working from the rear of the Rangemaster, for the right-hand oven, remove the four screws on the corners of the large cover plate at the back of the oven about half way down on the left-hand side as viewed from the back.
9 Remove the cover plate.
10 Go to the front of the oven. Above the burner assembly, towards the left is a thin metal rod running front to back. This is held in place by a clip at the back and by the hole in the metal frame at the front. Remove the metal clip at the back using a pair of long-nosed pliers. Retain the clip.
11 This should release the metal rod (flame sensing device) and you should be able to push it through the hole and out at the back. It is attached to a long copper wire.
12 Go to the back of the range. You should be able to work the wire back through the hole in the rear metal plate and up to the gas valve. The wire is held in place at the gas valve by a bent clip on the rear right. Carefully bend this clip back towards the oven to release the wire.
13 The wire goes down under the gas valve and to a threded bolt end into the bottom of the gas valve ad the bolt is held in place using a locking nut.
14 Remove the locking nut using a small spanner. The threded bolt should now turn, with the aid of long-nosed pliers.
15 The next trick is to remove this threaded bolt on the end of the copper wire and I have not figured out how to do that. It will unscrew a good way but becomes tight and will not come out, as though something inside the valve is holding it in place. Could it be that the flame sensing device has to be removed and inserted from inside the gas valve? If so, what a daft piece of engineering this is.
16 HELP.

SOURCE: Range burner will not turn off, the knob is tight and stuck

Not knowing age - very often older (standing pilot) ranges will have burner valves that become hard to operate. These are usually a tapered core valve that can be greased with a high temperature valve grease.

SOURCE: Gas oven

Its the flame failure device faulty (FFD)

SOURCE: Oven will not respond

try pressing the oven regulator knob for a while 3 to 5 seconds on ignition its a safty thing so kids cannot gas themselves all cookers have them. you have to hold it in.

SOURCE: Rangemaster 110

Reading the user manual, it states that the flame initially comes on low, until it is "sensed" by the flame sensing device. This to me sounds suspiciously like the flame isn't being sensed and so never gets increased to the normal level.
I've not had time for a proper look at it.... but from a quick glance this morning this looked like a "flame rectifier" probe next to my burner (as we commonly use in boilers to sense if the gas burner is lit). This is just a metal probe. They send a high-ish AC voltage signal (Sine wave) from it, through the flame, to the earthed metal case. The flame acts like a diode (yes it really does work !) and simple electronics detects the change in the applied signal (rectified) due to the flame. I know from personal experience they (the probes) get coated with crud (carbon, etc) and need a good clean. I suggest you try cleaning both it and the metal area opposite it. If necessary the probes metal tip could be GENTLY rubbed with very fine Emmery cloth, etc, if badly coated.
Other than that, if it is sensing the flame, then it must be the gas control device (solenoid valve ?) that is jammed, blocked or just defective.
Simples......