When I came around the corner to my heater this morning I could hear the electronic ignition trying to start every few seconds. Pump was not running because I had it turned off. The display was alternating “no demand” and “water sw open”.
I unplugged the heater
When I plugged the heater back in, “water sw open” was gone. I turned pump on circulate but made sure heat was off On my controller. The heater kicked into “spark” and fired up even know my controller was not calling for heat. I powered heater off and disconnected the 2 wire connection to the controller. Again, when I powered heater on, it fired up.
I switched heater from “remote” to “manual” and the heater functions as it should. In my opinion when Heater is on “remote” mode, the heater is always acting like there is a call for heat.
alw22. I am 99% sure you solved the problem. The 2 wire from my controller was too short in 2018 when I installed it so I spliced it. I cut the wire before the splice and the problem of it wanting to fire up had stopped. My multimeter is at work but I suspect that splice is bad and maybe a strand is poking thru. Thanks so much. Will follow up when I repair and test. Raining here now.