Water pressure sensor wiring after replacing heater header

Pool Clown

In The Industry
Sep 5, 2008
2,011
Silicon Valley, CA
The temp limits may, or may not be wired in series and are simple switches NC and open when subject to higher temps. The water sensor is a thermistor. The connection to the board for the switches may say hi temp, or limit, HL1 and HL2, hi limit, or may just say 1 and 2. The temp sensor may say sensor or temp and may be a three wire connection.

Sorry, i'm not much help with Hayward heaters.