Only hot water out of tub

[ttw4454]

I have a Moen Posi-Temp Pressure Balancing Valve. New construction. I can only get hot water out of the tub spout and shower head. I know I have cold water to the bathroom as I have it at the sinks. Could the cartridge perhaps be plugged? Any advice on how to proceed? Thanks,

 

[Dubldare]

Balancing spool may be siezed. Remove cartridge and shake (longitudinally)until pressure balancing slug moves freely. Reinstall.