Hayward Heater H400FDN

Noticed today but had no time to troubleshoot that my heater was running and should not have been.
Tried to place the heater in standby but pressing the mode button but did nothing. The Spa, heating and service lights were lit up. Had to turn the breaker off.
Any ideas before I get started? I recently had one of boards changedout but not sure which one it was.
 
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