sensor failure

I just had a pool installed this past summer and have not had to use the new Raypak electric pool heater. When we turned power on and it shows Sensor Open for all sensors as they blink one at a time. There appears to be 3 sensors that it states are open. Any ideas?

I have a Raypak 407A. Left the heater set at 84 for an evening and woke up to an error on screed reasing sensor error. The temperature reading is all over the place. When I attempt to turn it on, the screen says “no demand”, then “ignite” (I hear the attempt at ignition), then “sensor...