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HomeRepair HelpBosch A/C RepairBosch Air conditioner has poor temperature control Repair
Bosch Air conditioner has poor temperature control
If your Bosch air conditioner has poor temperature control, the unit may shut off too soon, run too long, cool unevenly, or leave the room feeling damp. The most likely cause is a faulty temperature control thermostat, which senses room air temperature and powers the fan and compressor. If it loses continuity or opens too early, you can end up with an air conditioner thermostat problem and an AC not maintaining temperature. Next, check the air filter. A clogged or dirty air filter restricts airflow across the evaporator coil, reducing cooling and potentially causing frost buildup. If airflow is still restricted, clogged indoor or outdoor coils may be keeping the system from moving heat properly. A Bosch thermistor issue can also cause poor temperature readings if the sensor’s resistance does not change correctly with temperature. Dirty condenser coils are another possible cause, especially if the air conditioner is not removing humidity or the compressor runs continuously. Enter your model number on RepairClinic.com to find the exact Bosch replacement thermostat, air filter, thermistor, or coil-related part for your air conditioner.
01 - Bosch Air Conditioner Temperature Control Thermostat
The temperature control thermostat is a sensor which monitors the temperature of the air and activates a switch to provide power to the fan and compressor when the air temperature drops below a set point. If the thermostat isn’t working properly, the air conditioner may not stay running long enough to remove the moisture in the air and cool properly. To determine if the temperature control thermostat is defective, use a multimeter to test it for continuity. If the thermostat does not have continuity, or is shutting off too soon, replace it. (Note: Some thermostats may also control a heater and, as a result, will have three...
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Top Solution
02 - 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.
Highly Likely
03 - Dirty or Damaged Air Filter
If the air filter becomes clogged with dirt, it restricts air flow over the evaporator coils. If the air flow 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 air flow even more. Eventually, the entire evaporator coil assembly will frost over, causing the air flow 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.
Common
04 - Clogged or Restricted Coils
Both the indoor and outdoor coils need to be clean for the air conditioner to work efficiently. A clogged or restricted coil will reduce air flow causing the unit to run inefficiently and longer.
Common
05 - Bosch Air Conditioner Thermistor
The thermistor is a sensor connected to the control board that detects the temperature of the air. The resistance value of the thermistor changes in conjunction with the air temperature. If the air temperature rises, the resistance value will decrease. To determine if the thermistor is at fault, use a multimeter to test it for continuity. If the thermistor does not have continuity, or if the resistance of the thermistor does not change with a change in temperature, replace the thermistor. (To find specific temperature and resistance values, try checking your user’s manual.)
Less Common
06 - Condenser Coils are Dirty
The condenser coils dissipate the heat as the refrigerant passes through the coils. If the condenser coils are dirty, they won’t be able to dissipate the heat as effectively. As debris builds up on the coils, the air conditioner will become less efficient, causing the air conditioner to work harder to cool down. If the coils are significantly dirty, the air conditioner will not be able to remove the moisture from the air and maintain the proper temperature, resulting in the compressor running continuously in an attempt to cool the room. Check the condenser coils to determine if they are dirty. Refer to owner's manual for cleaning instructions.
Less Common
Frequently Asked Questions
Why is my Bosch air conditioner not maintaining temperature?
Can a dirty air filter cause my Bosch AC not cooling or not dehumidifying?
Why are my Bosch air conditioner coils freezing up?
Why does my Bosch air conditioner keep running but the room still feels warm or humid?
How do I find the right Bosch air conditioner thermostat, thermistor, or air filter?
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