E05 and E06 is the error codes for a faulty stack flue sensor. try changing the sensor first is the cheapest. if that doesn't work check for corrosion on control board in which case will have to change out board.
Review the trouble shooting guides in your owner manual. You will find it says to look at the LEDs on the back of your main control board. They are difficult to see with the board installed, if you can't identify which LED is lit just remove the 4 small screws at the corners of the board,remove it a see which sensor LED is lit. You can bet it will lead you to an area to investigate, ie temp sensors, air flow sensors, water temp sensor etc. Hope this helps. I'm in the middle of the same troubleshooting process.
I had an E06 error on my Pentair Mastertemp 400. SFS LED on, so assumed to be the stack flute sensor. Took it out and measured the resistance between the contacts which was around 5 Megaohms. This was high, so I assumed it bad but when I got a replacement it was also about 5MOhm. Looked closer at the board and saw some corrosion on one of the ICs close to the SFS LED. After cleaning this with some alcohol and a toothbrush it sprang back to life. On power up you should see both the row of coloured LEDs and the column of red LEDs light up (startup self-check), then just the red PS stayed on for me an a few of the coloured ones. You hear the relay click. Display shows 128 then r14 which is the software revision. All fine now.
First picture is fault, second is startup, third is all working.
Answers & Comments
E05 and E06 is the error codes for a faulty stack flue sensor. try changing the sensor first is the cheapest. if that doesn't work check for corrosion on control board in which case will have to change out board.
Review the trouble shooting guides in your owner manual. You will find it says to look at the LEDs on the back of your main control board. They are difficult to see with the board installed, if you can't identify which LED is lit just remove the 4 small screws at the corners of the board,remove it a see which sensor LED is lit. You can bet it will lead you to an area to investigate, ie temp sensors, air flow sensors, water temp sensor etc. Hope this helps. I'm in the middle of the same troubleshooting process.
I had an E06 error on my Pentair Mastertemp 400. SFS LED on, so assumed to be the stack flute sensor. Took it out and measured the resistance between the contacts which was around 5 Megaohms. This was high, so I assumed it bad but when I got a replacement it was also about 5MOhm. Looked closer at the board and saw some corrosion on one of the ICs close to the SFS LED. After cleaning this with some alcohol and a toothbrush it sprang back to life. On power up you should see both the row of coloured LEDs and the column of red LEDs light up (startup self-check), then just the red PS stayed on for me an a few of the coloured ones. You hear the relay click. Display shows 128 then r14 which is the software revision. All fine now.
First picture is fault, second is startup, third is all working.
Jeremy