See Note Below. Secondary PCB found on Raypak 200, 280, 350, 430 gas heaters. It is used to control actuated valves and the Pool and Spa Modes. It also may stop the heater from functioning when it fails. Part may be labelled 96PE5003. Found on the lower right side of the main PCB.
New style PCB listed here. <-- Click
Important: As of 09/2020 the new style Raypak Heater does not allow controlling of the pump, valves, timers, etc.