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im having trouble starting my heater. please see issue below, any thoughts/ ideas appreciated. thx its a 6 year old in-ground pool, 10000 gals, sw pool, natural gas heater. when pump is on the standby light is on and heater looks happy. i press the mode switch to start heater and nothing...

when first powered up it shows around 5100, then display changes to 'HI'. last reading was around 2700 so i added a bag. its a 10,000 gal inground pool. one bag wouldnt raise this high. recently cleaned the gen, it looks brand new. any thoughts? also, what would be the symptoms of a bad cell...