Hi,

I'm just doing the electrical and physical installation of some units to a 2013 system that is controlled via an AG-150.

The NEW units are 2019 with an E3 suffix.

When testing (no gas) the controller seems to send the signal (fan turns green) then 10-20 seconds later after nothing has happened, go back to grey.

I'm assuming the E3 indoor units are not compatible with an older E system? Would upgrading the controller to AE200 fix this? Could I put an E pcb into the E3 unit?
Thanks
Alan