Consider the following statements,
High condenser pressure in a refrigeration system can occur because
1. The water flow rate is lower than the desired value.
2. Non-condensable gases are present in the system.
3. of accumulation of lubricating oil in condenser.
4. of low charge of refrigerant in the system.
Of these statements:

Correct option is C

(1) Low cooling-water flow — true. If the condenser cooling water flow is less than required the condenser cannot reject heat effectively, condenser surface temperature and pressure rise.
(2) Non-condensable gases — true. Air or other non-condensable gases in the condenser reduce the effective heat transfer area and raise the partial pressure of the gas space, increasing the condenser pressure.
(3) Accumulation of lubricating oil in the condenser — true. Oil films on heat transfer surfaces greatly reduce heat transfer coefficient, causing higher condenser temperature/pressure.
(4) Low refrigerant charge — false. Low refrigerant charge typically reduces circulating refrigerant mass flow and tends to reduce refrigeration capacity and suction pressure; it does not normally cause high condenser pressure (overcharge or insufficient cooling, fouling, non-condensables are the usual causes of high head pressure).