Prologic won't auto-start/stop Heater

[BoxfordPool]

Started pool this season and everything working just fine except heater. It fires-up just fine when manually selecting Mode=Pool, but the Prologic is not auto-starting the heater when the Pool Temp is below the set temp. Pool heater settings all look normal on prologic, set to auto-control, temp readings are accurate, heater set to on. Any thoughts?

 

[ajw22]

What model heater? Please put details of your pool in your signature. See What we need to know to answer your questions

Most pool heaters are controlled by the firemans switch. That is a simple 24V 2 wire connection between the automation and the heater.

when manually selecting Mode=Pool,

Is this on the heater control panel or Prologic panel?

 

[BoxfordPool]

Thanks for asking, I have a Hayward H400FDN heater, natural gas. The control Panel is Hayward Aqua Plus 16V.

 

[BoxfordPool]

The Mode button (Standby, Spa, Pool) is on the heater control panel.

 

[tstex]

when you want to auto start the heater, two ques:

1. How long has the filter pump been running?
2 What constant RPM's is the filter pump set to and for how long?

The heater will not fire-up if the filter pump is not at 2950RPM's or greater...I am not sure of the exact minimum RPM's, but I know there is one and I know it's high.

 

[ajw22]

See pages 24-26 in https://www.haywardflowcontrol.com/...s/prologic-consumer-troubleshooting-guide.pdf

I would check the low voltage 2 or 3 wire line used to control the heater that runs between the heater and Prologic panel.

See page 28 in https://hayward-pool-assets.com/ass...-series-installations-manual.pdf?fromCDN=true for the remote control connection to the heater.