HS210 rapidly and continuously switching on and off as soon as power is applied
I have tried installing two HS210 switches to replace two "dumb" 3-way switches controlling the same ceiling light. As per the subject the HS210's start rapidly switching on and off as soon as power is applied on the circuit breaker.
I have read in another thread that this may indicate contact issues with the neutral wire, but I've double checked them and all contacts seem firmly connected.
I understand certain types of 3-way switch circuit wiring may be incompatible with smart switches and may require a circuit change; is this the case here?
Would anyone have any suggestion for me to troubleshoot/fix this?
Below is the wiring on my old 3-way switches. I have labeled the wires as instructed in the HS210 install manual.
3-way switch closer to the circuit breaker:
3-way switch closer to the ceiling light:
Any help would be greatly appreciated.