Newly installed heater isn't working

I just installed a new Balboa M7 heater and it doesn't work. It's and exact replacement of the previous heater (4.0w). The pump works and I have 240v coming into the control board. Each terminal on the heater (multimeter one lead on the terminal and the other on ground) has 120v but when I put a lead on each terminal I get 0v (I thought it was supposed to be 240v?).

The panel is acting funny as well. The temp continually flashes 104 or cycles F1-F8 on a loop. The lights don't work. I can get the pump to turn on if I press and hold the jet switch (first time low, second time high, and third time off).

Nordic Escape SE
Balboa NORVS300 240v Spa Pack (part #55887-04)

I replaced the heater because it was causing my GCFI to trip. There was corrosion on one of the terminal posts and a small leak in that area.

Any and all help is much appreciated!!
Chris

 

Welcome to the forums.

That 4.0 KW = 4000 watts.
Yes that is acting funny. Could it have gotten wet ?

Your water temp should be no where near 104° with the heater out of commission.
If it thinks the water is that hot the heater probably wouldn't turn on.

Many times one leg of the 240v power is connected to the heater and the other leg is switched. Most spa packs are switching both legs now due to destructive element shorts. I need to look up your spa pak for more info.

 

Pete

The board got water on it when I pulled the old heater out. I ran a blower on it for a while and let it sit before applying power. I didn't see visible water on the board (famous last words I'm sure!). I think it must be an older spa pack (I acquired it when I bought the house 2 years ago) the previous owner purchased around 2012-2015 or so.

The power is currently shut off the to whole system.

Thanks

 

Now I'm reading 240v on the two heater leads and the control panel is normal. Its reading the correct water temperature (67F) which is slowly increasing. I think you were correct in your suspicion of a wet control board?