If it cannot be moved
A master bedroom in the fire corner is read as heat where rest should be — the tradition associates it with disturbed sleep and short temper. The standard remedies are cool colours, no electronics near the bed, and the bed itself moved to the room’s south-west.
What the ಆಗ್ನೇಯ governs
The south-east — Agneya — is the fire corner, and it is where fire belongs. The kitchen, the boiler, the electrical load: the tradition puts heat here because heat placed elsewhere is held to disturb the zone it lands in.
Where the ಮುಖ್ಯ ಶಯನಕಕ್ಷ belongs
The master bedroom is meant to sit in the heaviest, most settled part of the house, on the theory that the person carrying the household should sleep where the building is most grounded. It is a placement about stability rather than energy.