Carrier Error Code 18: Outdoor unit control box fault (G-Tr short circuit protection)
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Is your Carrier air conditioner showing up with Error Code 18 on the screen?
Outdoor unit control box fault (G-Tr short circuit protection)
Contact air conditioner technician.
You may find your Carrier air conditioning unit needs resetting if it starts to malfunction or isn’t responding to any input via your control panel or remote control. Resetting your air conditioner re-starts the internal computer and can often restore the unit to normal working order. The exact instructions will vary depending on your model of Carrier air conditioner.
Typically, this procedure will be:
During normal air conditioner operation, dust, dirt, moisture from humidity or condensation, and microbial growths can build up on internal components. Left unchecked, these issues can corrode components like the evaporator coil and condenser coil. Over time, those components can become less effective and lead to a loss of efficiency or worse, a shorter air conditioner lifespan.
Regular AC maintenance and tune-ups can minimize many of the issues caused by a build-up of dirt and debris. If they are performed by an HVAC technician, these inspections allow your contractor to check for longer-term issues and in some cases take proactive steps to prevent premature failure or inconvenient breakdowns during the cooling season.
Annual air conditioner preventative maintenance may also be a requirement to keep your warranty valid as well. Many manufacturers state on warranty documentation that installation and maintenance by a licensed HVAC service provider are a part of the warranty conditions.
One simple way to potentially save money and prolong the life of an AC system is to make sure the outdoor unit stays clean. During normal operation, a fan in the outdoor unit pulls air through the condenser coil. Airborne dust and dirt particles and debris from nearby foliage can get lodged in the coil fins, restricting airflow and affecting performance. Four air conditioner preventative maintenance tasks that can keep the outdoor unit clean:
One of the easiest air conditioner preventative maintenance tasks you can perform yourself is to clean or replace your system’s air filter. The air filter for your AC system will be located in or near your indoor unit. Whether it is a basic 1-inch filter, a larger, 4-inch media filter or a more sophisticated electronic air cleaner or purifier, the filter should be cleaned or replaced periodically. These air conditioner filters can help with indoor air quality by removing airborne particles and pollutants from your home. They can also help keep your system operating at its peak performance by reducing the buildup of dust, dirt and other particles from accumulating on internal components like the blower motor.
How often to change air filters depends on a number of factors:
It’s a good idea to check and inspect your filter at least once every 2-3 months. Some filters, such as the wider 4-inch media filters can last up to 1 year before replacing. Whenever possible, follow your manufacturer’s recommendations for filter maintenance. In general, to clean or replace your AC system filter, follow these steps: