Sta Rite Sta-Rite Max-E-Therm High Effiency - Propane Heater - 333,000 BTU "need user manual model 110" Questions

...Model SR400NA. When the heater turns on, the display shows a pool temperature of 109-110, which means I cannot get the heater to blow. The water temp is actually 75 degrees so the unit is ...

need a multimeter for this. If it is connected to an outlet, check to see if there is a gfci and it has not been tripped. You should be getting 110-120 vac at the outlet all the way to the transformer