3.5 to 4K If you want to bypass the sensor just jump a 1 dollar resistor in between the two wires. If you want to put another sensor just use a standard gas heater flute sensor(2dollars) and put in line with the resistor
Are you getting E05 error? I can't give you the value, but it is possible to bypass the switch. Unhook the sensor connection wires and jump them together. Hold off switch until a code comes up - press down arrow once to change last value from 1 to 0, press off again and do the same thing with the next value and change it from 1 to 0, press off again. Unit should work now until you get a new sensor and then just change the settings back.
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Error pertains to stack flue sensor setting.
There are two modes for low level programming and default is a (0) Zero but for outdoor spas this must be reset to a one ( 1 )
Just hold the off button down for 30 seconds let up, press down again, use arrow buttons on key pad to set from 0 to 1...press off again....play with it and see for yourself...I don't now why Sta-rite buries this information and makes us guess.
Again, on mine, this all pertains to the Stack Flue Sensor setting.... you can look at your heater and see what they look like...outside toward bottom the SF must be a 1 and not Zero or you get the quick flash 128-R8 notice...also, the Stack flue senor is finicky and connections must be good...use steal wool to re-seat but be careful as connector break off easily thus requiring a new stack flue sensor...
I accidentally discovered this when I turned the board upside down and spotted the LED red light on indicating a fault with the SFS**
I wish some one would tell us how to by-pass the stack flue sensor to make the heater work.
Good luck...hopefully the power button is close by and your board is working....
I am not sure if you have received an answer to the issue, or not, but just in case! An EO5 error code is an open stack flue sensor, or switch, There are two forms of the stack flue sensor, so you will need to know which one you have on the heater.
What this error code means is that the sensor "read" the flue temp to be over 500 degrees. Usually, it is just gone bad and reading the wrong temp.