Pentair MasterTemp 200 Error code E05

[tgray]

I have a Pentair Master Temp 200
I keep getting error code E05
I have replaced the Flue sensor and still get the error.
I replaced the Temp regulator in the water side.
I have good Flow thru the heater
I ohm the leads from the flue sensor to where the wires connect to the control board and get 3.8 ohms
When I press and hold the pool on button to see the flue temp, I get 80 and flashes 40
Any help would be great .
Thanks

 

[kimkats]

I don't know the answer but am giving you a bump so maybe some one who does will see it.

 

[RedBluePool]

You have a bad stack flu sensor. That's what the E05 error code ussally means. The stack flu sensor is located on the side of the vent. The job of the stack flu sensor is to sense the temperature coming out of the vents. If you replace the stack flu sensor and you still have the error. Then you're going to have to replace the control board located the lid of the heater.