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Thanks again.
No I have never replaced the thermister. Been a while since I checked, but it seems that it was a $100.00 part. Probably more these days. A bit expensive to replace on a guess. Not that I won't if it seems like a good idea by someone who knows more than I do.
Yes the Sensor Fail Led that can be seen in the photo. It is mentioned in the diagnostic flow chart. That can also be seen in the photo. Of course the suggested "fix" is replace the board.
I have 5 of them. I'm tempted to start removing parts and testing them. Sadly I don't know how to test...
Thanks guys for the help.
The pool temp is 68*F as measured by the pool thermometer.
My readings are SR-COM=12.73K ohms
ST-COM= 11.87K ohms
Seems within the 10% differential. But I am not sure how to test the rest of the board. Still seems odd that I have had...
The existing thermister is a single unit.
I may not have explained what I am trying to accomplish with the test thermister idea. The board has a potentiameter that adjusts the temp setpoint. I have checked and the resistance does vary with the turning of the knob on the pot. I am pretty sure...
Sorry about the backside photo. I should have orented it as the frontside is. The thermister connection in the second photo is the three solder joints at the bottom of the photo.
Is this correct thermister as suggested in post 4...
This is one of the boards that I have replaced. Part of what makes me question the thermister is that, if I unplug the connector while the unit is powered on I can hear the relay click and the gas valve click open and close quickly. In the past I have been able to get the unit working if I tried...
Thanks guys for the replies. I have taken photos of the board. I will post as soon as I can figure out how to get them from my phone to my computer. Always a PITA for me. Seems like it should be simple.
I will also take a reading between ST-SR. But unsure what it will read, the water temp is...
I have a pool heater that I have to replace the electronic control board often. I have now replaced the board 5 times. Each board shows the same issue when it needs replaced. I have tested all of the control switches all test good. The thermister is one item that is not basically an open or...
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