Blocked filters and dirty fan rollers can cause the following issues with split air conditioning systems:
Damp mouldy smell
Excessive water dripping from the unit
Noise indoor unit
Excessive mould growth
Mould inside your air conditioner:
The most dangerous type of mould is the kind that's hidden. Going unseen and undetected, it spreads rapidly throughout your room, exposing you and your family to countless health problems. If you do detect slight mould, at either mild to low moderate levels, you can remove it through thorough cleaning, exposure to sunlight, and through proper ventilation. However, detecting and removing mould is far trickier with air conditioning systems. Most people aren't even aware that mould can and probably is inside your air condition.
These prices are for air conditioners that are in working order and require cleaning. If the air conditioner has not been serviced for 4 or more years and is very dirty (i.e. visible mould growing inside the unit) then theses prices may increase.
Strip down and removal of casing indoor unit.
Coil clean the indoor evaporator
Clean and flush out water drip tray
Check outdoor unit for any debris blocking the condenser Temperature check