Hob Gas supply failure to hob. The ovens are working normally, but the supply to the gas rings on the hob has failed. How can this be rectified?

At the rear of the oven is a gas cut off valve. Try twiddling it

I have a delongi oven and hob hob is working fine but the oven isnot im turning the nob on the front of the oven and ignition on lighting is fine after I release the knob on the front the supply turns striaght off no flame no gas nothing

Normally the 720ef is the oven, the hob is a separate unit and in my case is a STOVES 600G gas unit. Your unit may have a built on hob but the handbook for the 720ef does not detail this. In my case the hob ID is on the lower right hand side of the unit.
I think you will find that the elements may have failed but you will need to identify the hob to ensure correct replacements. Normally the element rating is on the base of the element. The handbook will tell you how to take the thing to pieces. It is possible that the hob element controls have failed but unlikely for all three or it may be a combination of both parts. I think you may have to contact an electrician to test everything to sort this out.

I would call a gas installation engineer as to me the pressure sound incorrect.
Safety is paramount with gas.

Matsui MSP60 Stainless steel Built-In Oven and Gas Hob Package. Matsui MSP60 with Hob: 4 Burner Gas Hob, Fan oven, Minute Minderand B Energy rated top oven. Matsui MSP60 Stainless steel Built-In Oven and Gas Hob.
Product Features


•Dimensions (cm): (H)59.0 x (W)59.5 x (D)57.0
•Ovens: Fan oven
•Timer: Minute Minder
•Hob: 4 Burner Gas Hob
•Colour: Stainless steel
•Energy rated top oven: B


Hope this helps. Your generous rating will be much appreciated.

Hi,
Here is a tip that I wrote that will help figure out why the burner spark keeps on clicking...

Gas Range Repair Burners Keep on Clicking
http://www.fixya.com/support/r4033033-gas_range_repair_burners_keep_clicking

heatman101

not a solution I'm afraid - I'm having the same problem. How did you manage to fix it?

IMMEDIATELY ISOLATE THE OVEN AND DO NOT USE. GET PLUMBER BACK - HE SHOULD BE ABLE TO CHECK THE APPLIANCE ITSELF FOR LEAKS BUT THE MOST LIKELY CAUSE IS THE JUNCTION OF THE CONNECTION HOSE WITH THE HOB

If you are in the USA most codes require a seperate circuit for the oven and the cooktop. Most cooktops require 30 amps and at least #10 wire.

trust you have set the clock as this turns the gas supply on to the ovens