Heat pump 13 stuck check valve

Heat pump with a stuck check valve.
Indoor vs outdoor, stuck open vs stuck closed.
From taking a test to diagnosing a live systems lets explore a variety of stuck bypass check valves in a heat pump application.
Some of these will be be more applicable than others but the idea is to get you thinking about the heat pump cycle.
Outdoor check valve stuck open in AC mode
Outdoor check valve stuck open in Heat Pump mode
Outdoor check valve stuck closed in Heat Pump mode
Outdoor check valve stuck closed in AC mode.
Indoor check valve stuck closed in AC mode
Indoor check valve stuck closed in Heat Pump mode
Indoor check valve stuck open in Heat pump mode
Indoor check valve stuck open in AC mode
Special thanks to JD Kelly student of HVAC for the awesome graphics!