If the fridge part of your Bosch fridge/freezer is frosting up on the back panel and then turning to water quickly, there may be a few potential reasons for this issue:
Frost build-up due to a malfunctioning defrost system: Refrigerators have a defrost system that helps prevent excessive frost build-up on the evaporator coils. If this system is not functioning properly, it can lead to excess frost forming on the back panel of the fridge compartment. When the fridge goes through its defrost cycle, the frost melts into water, which then pools at the bottom and may leak out. Common causes of a malfunctioning defrost system include a faulty defrost timer, defrost heater, or defrost thermostat.
Poor door seal or gasket: If the door seal or gasket of the fridge is not sealing properly, warm air from the surroundings can enter the fridge compartment. This warm air can condense on the cold back panel and freeze, leading to frost formation. When the fridge is not in the cooling cycle, the frost will melt into water.
Overloading or obstructing the airflow: If the fridge is overloaded with items or if the air vents inside the fridge are blocked by food items, the proper airflow may be restricted. This can cause uneven cooling and lead to frost formation on the back panel.
Thermostat or temperature control issues: A malfunctioning thermostat or temperature control can cause the fridge to become too cold, leading to excessive frost build-up.
Coolant leakage or low refrigerant levels: If there is a coolant leakage or the refrigerant levels are low, the cooling efficiency of the fridge can be affected, resulting in frost formation on the back panel.
It's essential to have a professional technician inspect and diagnose the specific problem with your fridge. They will be able to identify the underlying issue and perform any necessary repairs or part replacements. In the meantime, you can try to ensure the door seals properly, avoid overloading the fridge, and keep the air vents unobstructed to help mitigate the frost buildup.