Tri county
New member
My reznor heater model # sft150 natural gas is throwing a code ,3 blinks,for pressure switch.all vents are clean,no water in either hose,no cracks in the lines,but while its throwing the code,if i remove one of the wires on the pressure switch and put it right back on it clears the code and the furnace fires right up and runs awesome.the second it shuts down and goes to fire again,it throws the pressure switch code again.im at a loss....please....anything will help