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HomeRepair HelpBosch A/C RepairBosch Air conditioner coils freezing Repair
Bosch Air conditioner coils freezing
If your Bosch air conditioner coils are freezing, the problem usually starts with restricted airflow. A dirty or damaged air filter is the most likely cause because it limits air moving across the evaporator coil, letting frost build until the AC coils are frozen and airflow drops even more. If the ice is forming in just one area, a sealed system or refrigerant leak may be the issue, which requires a licensed technician. A dirty evaporator coil can also cause evaporator coil freezing, especially if the blower wheel is clogged or airflow through the unit is weak. On Bosch window air conditioners and stand-alone units, a failed dual shaft fan motor or fan motor can stop the fan blade or blower wheel from moving air properly, leading to a window air conditioner freezing up and possible compressor overheating. Clean or replace the air filter first, then check airflow components. Enter your Bosch air conditioner model number on RepairClinic.com to find the exact replacement air filter, fan motor, or other part that fits your unit.
01 - Dirty or Damaged Air Filter
If the air filter becomes clogged with dirt, it restricts airflow over the evaporator coils. If the airflow is reduced, the evaporator coils get too cold, which then causes the humidity in the room to condense on the coils and freeze. As frost accumulates on the coils, the frost restricts the airflow even more. Eventually, the entire evaporator coil assembly will frost over, causing the airflow to be completely restricted. Most air filters used in stand-alone air conditioners can be cleaned with soap and water. Only filters that are extremely clogged with debris or damaged will need to be replaced.
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02 - Sealed System Leak
If the air conditioner coils are freezing in only one area, there may be a sealed system (or refrigerant) leak. This is normally a very expensive repair. Repairs to the sealed system must only be performed by a licensed technician.
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03 - Dirty Evaporator Coil
Proper air flow is critical for the air conditioner to work properly. The evaporator needs sufficient air flow to keep the condensing water from freezing. If the evaporator coil, air filter or blower wheel gets clogged, air flow will be reduced and ice can start forming on the evaporator coils, eventually freezing them up. It is recommended to replace the air filter routinely. Refer to owner's manual for air filter replacement frequency recommendations and for evaporator coil cleaning instructions.
Highly Likely
04 - Bosch Air Conditioner Dual Shaft Fan Motor
An air conditioner dual shaft fan motor is the component that spins the fan blade and blower wheel to both draw air into the unit and force it through the front vent and out the rear condenser coil. If the fan motor is burned out, the air won't be circulated which can cause the coils to freeze and the condenser and compressor to overheat. You can use a multimeter to determine if power is reaching the fan motor. If power is reaching the motor, but it doesn't run, the component will need to be replaced.
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05 - Bosch Air Conditioner Air Filter
If the air filter is clogged, air cannot flow properly through the air conditioner. This greatly reduces the cooling capacity of the air conditioner. In addition, if the air filter is clogged, the evaporator coils will frost over. Most air filters used in stand-alone air conditioners can be cleaned with soap and water. Only filters that are extremely clogged with debris or damaged will need to be replaced.
Common
06 - Bosch Air Conditioner Fan Motor
An air conditioner fan motor is the component that spins the fan blade or blower wheel to circulate the air. If one of the fan motors is burned out, the air won't be circulated properly which can cause the coils to freeze. You can use a multimeter to determine if power is reaching the fan motor. If power is reaching the motor, but it doesn't run, the component will need to be replaced.
Common
Frequently Asked Questions
Why are my Bosch air conditioner coils freezing up?
Can a dirty air filter cause a window air conditioner freezing up problem?
What should I check if my Bosch AC has weak airflow and the evaporator coil is freezing?
Can a Bosch air conditioner fan motor not running make the coils freeze?
How do I find the right Bosch air conditioner air filter or fan motor replacement?
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