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Gas Hob Problem

Looking for someone who is expert with problem gas hobs. The hobs (shown) wouldn't ignite so got Gas & Plumbing HQ Ltd in to repair Aug 17 but hobs played up again soon after. As they charged over $900 and were going to charge more to return - got in another excellent guy who fixed problem who no longer lives in ChCh. We are now finding they are not igniting again - knobs not 'clicking'. Can only be used if small right hand front hob is turned on slightly then others will ignite. Due to the costs to date we are reluctant to spend more on this beast unless we find someone who is confident they know what the problem is and will not charge excessively without prior consultation e.g. Plumbing & Gas - copy of inv outlining work done. Your help is appreciated.