hot tub problems

I have 20 YEAR OLD COAST PARADISE SPA 220 W TWO PUMPS,,THE SPA PACK DIED AND I BIT ON THE REBUILD GUYS,,,THAT LASTED A MONTH AND FRIED,,I DETERMINED TO KEEP TUB AND I BOUGHT A NEW S CLASS HOOKED IT UP AND HAD A PUMP ONE START ISSUE WHICH I MAY OF HAD BEFORE WHEN THINGS STARTED GOING SOUTH
, SO I DETERMINED PROBABLE CAPACITOR AND BOUGHT A NEW PUMP,I REPLACED PUMP#1 AND HOOKED IT TWO THE NEW S CLASS SPA PACK THAT ONLY HAD A MONTHS USE BEFORE I GAVE UP FOR WINTER THE A REPLACEMENT S CLASS GECKO,
,MY WIFE WAS ALL EXCITED FOR A EVENING OF RED WINE ,HOWEVER THREE DOT ISSUE AROSE ,DRIVING ME NUTS.
PUMP ONE IS TWO SPEEDS CIRCULATE AND HIGH,,PUMP TWO IS SINGLE SPEED HIGH.
WHEN 3 DOTS COME ON ON AND ONLY PUMP#1 IS ON THE UNIT DOES NOT HEAT EITHER.
THREE RED FLO DOTS ONLY ON WHEN OPERATING ON PUMP31 IN EITHER MODE,,,WHEN I TURN THE SECOND PUMP ON 3 DOTS GO RIGHT AWAY AND IT HEATS WITH HIGH PUMP ON,
I BY PASSED PRESSURE SWITCH AND LIGHTS DID NOT GO OUT,,,I TOOK FILTER OUT NO CHANGE
(ALTHOUGH I DO NOT SEE A LOT OF WATER MOVEMENT IN FILTER HOUSING OF WATER BUT PLENTY WHEN PUMP TWO IS TURNED ON).
PRESSURE SWITCH ADJUST??,,THE NEW PUMP DOES SEEM TO MOVE THE WATER OKAY IN THE JETS AND CIRCULATE SEEMS OKAY SO I DOUBT THE IMPELLER IS BROKE ,I WOULD THINK A BAD GATE VALVE I WOULD HAVE NOTICED ANY THOUGHTS?
THANK YOU DENNIS S