went to service this today,did a gas rate on high and was getting no were near what it should be, i turned it down to low and the flames did not change,so i was gas rating on low which was correct, my problem is it will not turn up to high, i have 20mb at inlet to fire,it did how ever drop to about 17mb when fire was on, 1 m from meter ? it is one of those big hole little hole tapered affairs,with thermo eletric valve incorporated any ideas on why its not turning up to high flame,help me to help you .
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