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What happens if the controller or Advanced Pilot Valve (APV) malfunctions? Could the pressure go dangerously high or could the flow into the DMA be cut off?

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What happens if the controller or Advanced Pilot Valve (APV) malfunctions? Could the pressure go dangerously high or could the flow into the DMA be cut off?

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A watchdog continuously monitors the health of the controller and the correct operation of the APV. If it detects a malfunction in either the controller or APV, it puts the whole system into safe mode which means that P2 is maintained at a safe predetermined pressure. The controller also sends out an alarm so that the fault can be investigated.

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