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@ajw22 I installed the new board and 6 button pad and it worked like a charm🥳 Thank you so much for your help.

@ajw22 I’ve checked again that all connections are correct and that the voltages are correct. Also, I’ve received the updated board and 6 button membrane with FC connector. I will be installing them today and post the results. Thank you!

@ajw22 this morning I reinstalled the original board and new fuse. I followed the step by step process of plugging in each J connector and checking the fuse. I was able to plug in all the connectors and the fuse is still good. I check voltages to the FS and they’re 24VAC but the display on the...

@ajw22 the troubleshooting guide from the manual is what I followed. So you mentioned a 24v safety sensor which I had no idea about. How does that work? I ordered more fuses because I depleted the 10 I had so I’m planning on testing the original board again. I will return the board I ordered...

At this point I don’t know if the old board is bad. The last test I did with the original board I was able to connect all the connectors and membrane pad and the fuse didn’t blow. However, the heater was not displaying anything and none of the LEDs worked. I tried removing the membrane pad and...

@ajw22 the fuse doesn’t blow with just J7 connected to my original board but there's nothing on the display and the heater doesn’t start. When I plug in the new board just to J7 the fuse blows.

Here’s my fireman switch removed for inspection

This is my original board

@awj22 I checked the fireman switch and it’s in perfect condition. I also checked the wires to the FS and they do not have conductivity to ground so I guess the issue is with the control board? I actually ordered 2 control boards from amazon. They are the same model as the original one but look...

@ajw22 yes the fuse blew with just j7 connected

@ajw22 I tried the process you suggested and I found that the fuse blown with all the connectors to the ICM unplugged. All the connectors to the main board were plugged in and the FS jumper was on. I’m using 1 am fuses from Home Depot which could be the issue. I just ordered 1.25 amp fuses from...

Thank you AJW22 I appreciate your help. I’d like to think that I can use the multimeter instead of a bunch of fuses. The breaker to the heater is at the other end of the house so it’s very time consuming to walk there and turn it off and on for the test procedure you’re suggesting. It makes...

I checked the transformer and it has 24 VAC out

Helllo! Good morning! I just did a round of testing (again) on the wiring for my heater. I measured the ohms between ground and the ends of the cables in J1 and there was none except for the GND wire which makes sense. I made a video that hopefully explains the issue I see better. Should there...

Thank you so much for your response. I will try this process today. I guess I will need to buy a new J1 harness since it seems to me that’s the problem. I will post what I find out. Thank you!

Thank you so much for your response!

The fuse doesn’t blow with J7 on. It does blow only with the J1 connection on. The problem is that the ICM is brand new so I don’t know if I got a dud or if the problem is with the wiring. Is there a way to test the ICM? You say “the only connection at the ICM that should have zero or near zero...

Hello! This is my first post ever but I’ve been searching and reading the forum for a while about all sorts of issues with my pool. I use TFP app to track and balance my pool chemistry and I love it. However, I’ve been having a problem with my heater. It’s a natural gas Pentair Mastertemp 250...