It's 10 years old. I replaced the thermostat sensor 4 months ago when the temp was incorrect. It's been fine since. It won't fire at all. The service light is on
Check to see if you have a stack flue sensor or switch. A switch is only open or closed. A sensor checks actual stack temperature by measuring the resistance of the sensor and correlating it to temperature based on a known graph.
The sensor should be reading 3.8 Mega Ohms at 77 degrees Fahrenheit.
Check to make sure that the board is set for the correct sensor type.
It is a sensor not a switch. Unfortunately I can't test the ohms at 77 degrees due to low temps. I've changed nothing on the board and it's been working so I assume it's set correctly.
E06 means that the board is getting a reading of 0 ohms from the sensor. Check the resistance, if it's 0, you have a bad sensor. If it's high, you probably have a bad board.
You can remove the sensor and take it indoors to check at room temperature.
Good morning. Weird thing. I started up the heater this morning and instead of freezing with the E06 error, it's reading the temperature fine at 54° but will not start. So I flipped over the control board and the SFS is on. When I test the sensor holding one probe at the end and the other at the nut end it reads 0. Will a new sensor solve it?
Even weirder. When I turn the heater off and on at the breaker without the sensor attached it works fine heater comes on start heating up and the service light is off. I can even now turn it off using the buttons. I'm going to assume it's definitely the flu stacked sensor. Can I use the heater without it?
There is a water temperature sensor and a stack flue temperature sensor. The temperature displayed is the water temperature.
The SFS checks the exhaust gas temperature.
To check the stack flue temperature, press and hold the "Pool On" button for about 5 to 10 seconds.
If you remove the two halves of the heater cover, you can access the sfs. It's in the 90 of the exhaust flue. Take that out and measure resistance. It should be about 3.5 to 4 mega ohms. If it's zero, it's bad.
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