8 kg automatic whirlpool washing machine

8 kg Weirpool washing machine. The drum drive pulley was replaced about 4 months ago. After that, it broke again due to the valve controlling hot and cold water inlet, which was replaced. However, currently only the hot water works, and I don't know why the cold water doesn't work. The warranty has expired. The authorized service agent for this brand is Al-Zaqzooq Company.