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Take the tiny screws of there are loads down right hand side then release screws on hob once you can lift hob plates up. Undo the covers on back of timer clock control . Make sure you un plug from mains . Take the neutral of back of timer clock. This will allow your oven to auto ignite again
I let the screws soak for a few days in release oil but with no success. I decided the only way to get the seized screws out was to drill and tap new holes through the hob and into the hob burner mixing tube support flanges. This allowed new screws (stainless as opposed to the standard, chrome plated steel screws) to be screwed into place. Once this was done I then drilled out the heads of the remaining seized screws. This allowed the hob tops to be removed so that the oven thermostats could be changed. The hob screws were then screwed back into place and lubricated with loads of high temp. copper grease to prevent corrosion. I will also remove and re-grease these screws every six months or so to prevent any chance of seizure in future!
A few points to remember: (a) make sure that any holes in the hob top are sealed with something such as a screw coated with high temp fire cement etc. to prevent any possibility of unburnt LPG getting into the space below the hob top. (b) make SURE that you do not drill or tap into anything that could damage the cooker and cause a gas leak or damage any of the gas ignition leads etc. (c) Make sure that the appliance is totally 'gas tight' after doing any work which will disturb the gas connections, and (d) If you don't have gas qualifications and are not sure of what you are doing then get an expert, registered gas engineer to do the work for you. Don't take a chance with gas!!
gud day,try to clean the bottom of knob control by removing of knob then clean if by using a vacciumm,if u want to use manually ur cooktop unplug the unit to stop the cliking,then use macthes every time to on the gas cooktop.