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HomeRepair HelpMars Central A/C RepairMars Central air conditioner has poor temperature control Repair
Mars Central air conditioner has poor temperature control
When your Mars central air conditioner has poor temperature control, uneven cooling, or an AC temperature that is not accurate or holding steady, start with the air filter, the most likely cause. A clogged air filter restricts airflow through the furnace or air handler, reduces cooling capacity, and can cause the evaporator coil to frost over. Next, check the wall thermostat. Failed thermostat contacts can make the condensing unit or air handler operate intermittently; a multimeter continuity test can confirm whether the thermostat needs replacement. Blocked or leaking vents are another possible cause because they prevent cooled air from reaching rooms evenly. An oversized air conditioner may also cool quickly and shut off before air circulates throughout the home, causing temperature swings. Replace the air filter, inspect accessible vents, and use your model number to find the exact replacement thermostat or other part for your Mars central air conditioner. Thermostat testing is generally low-voltage work, but shut off power before servicing. Do not open the disconnect box, furnace, air handler, or condensing unit for 240-volt repairs unless qualified; hire a licensed HVAC technician for line-voltage or sealed-system work.
01 - Mars Central Air Conditioner Air Filter
Check and replace the air filter at least twice a year, more often in dusty/dirty environments or if there is a pet in the home. A clogged air filter will greatly reduce the air flow of the furnace or air handler which can result in poor temperature control when trying to heat or cool the home.
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Highly Likely
02 - Mars Central Air Conditioner Wall Thermostat
The wall thermostat has electrical contacts that control the power supply to the furnace or air handler and condensing unit. If the contacts in the thermostat fail, certain components of the cooling system may not work or may only work intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the wall thermostat does not show proper continuity, replace it.
Common
03 - Mars Central Air Conditioner Wifi Thermostat
The WiFi thermostat has electrical contacts that control the power supply to the furnace or air handler and condensing unit . If the contacts in the thermostat fail, certain components of the cooling system may not work or may only work intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the WiFi thermostat does not show proper continuity, replace it.
Common
04 - Clogged Air Filter
If the air filter is clogged, air cannot flow properly through the home's venting system. This greatly reduces the cooling capacity of the air conditioner. In addition, if the air filter is clogged, the evaporator coils will frost over and not be able to remove moisture from the air. The air filter should be checked and replaced at least twice a year, more often in dusty/dirty environments. Refer to owner's manual for guidance.
Less Common
05 - Blocked or leaking vents
The furnace or air handler must have good airflow to work properly. A blocked or leaking vent can prevent good air flow and cause inconsistent room temperatures.
Less Common
06 - Oversized air conditioner
An oversized furnace or air handler will quickly heat or cool the home and shut off. This causes acceptable temperatures in certain areas but not in others. The circulated air needs time to distribute evenly throughout the home; the air recirculating through the furnace or air handler for longer periods of time will produce better results.
Less Common
Frequently Asked Questions
Why is my Mars central air conditioner not holding temperature?
Can a thermostat cause poor temperature control or uneven cooling?
Can a dirty air filter make my central air conditioner not cool properly?
What should I check if my AC temperature is uneven from room to room?
How do I find the correct Mars central air conditioner replacement part?
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