Carrier Residential HVAC Systems

This alert indicates that Zone 7 is experiencing low indoor temperatures and the system is allowing auxiliary heating to engage to try and reach the setpoint. This could mean the primary heat source isn't keeping up.

This alert indicates that Zone 8 is experiencing low indoor temperatures and the system is allowing auxiliary heating to engage to try and reach the setpoint. This could mean the primary heat source isn't keeping up.

This fault indicates that the furnace blower motor detected it was running immediately after the system powered up. This could point to an issue with the blower control or its sensor.

This fault indicates that the low-pressure safety switch has opened, signaling that the refrigerant pressure in the system is too low. This can lead to system shutdown to protect the compressor.

This fault indicates that the high-pressure safety switch has opened, signifying excessively high refrigerant pressure within the system. This causes a shutdown to prevent damage to the compressor.

This fault indicates that the furnace has experienced a limit lockout. This typically happens when the internal temperature of the furnace exceeds a safe operating limit, causing the system to shut down for safety.

This fault indicates a problem with the outdoor air temperature sensor. The system cannot accurately read the outside temperature, which can affect heating and cooling operation.

This fault indicates a problem with the coil temperature sensor. The system cannot accurately monitor coil temperatures, which can impact defrost cycles or heating/cooling performance.

This fault indicates that the furnace has failed to ignite after multiple attempts and has entered a lockout state. This is a safety measure to prevent gas buildup.

This fault signifies a lockout condition related to the furnace's blower operation. The system has detected an issue that prevents the blower from functioning correctly and has shut down.

This code indicates a loss of communication between system components such as the Fan Coil, GeoHP, 18VS, 19VS/V-HP/AC, Greenspeed/Extreme, or Infinity/Evolution ODU units. The system cannot properly exchange information.

This fault indicates that the furnace has gone into a lockout mode specifically for its gas heating function. This usually occurs after multiple failed attempts to ignite or sustain a flame.

This fault indicates that the furnace's flame sensor is not detecting a flame after ignition, or it's detecting one when it shouldn't. This prevents the furnace from operating safely.

This fault on a furnace indicates that either the Low Pressure Switch (LPS) or High Pressure Switch (HPS) is closed when it shouldn't be. This suggests an issue with refrigerant pressure or sensor readings.

This fault indicates that the 24-volt AC fuse in your furnace's control board is open, meaning it has blown. This typically cuts power to the low-voltage control circuits.

This fault indicates that the system control board has detected an invalid model type or configuration. This can happen with various components like the Furnace, Fan Coil, GeoHP, Greenspeed/Extreme, or Infinity/Evolution ODU units.

This fault indicates that the Fan Coil unit's control system has detected an incorrect or incompatible heater size. This could prevent proper heating operation.

This fault indicates that the Fan Coil unit's control system has detected an incorrect or incompatible Air Conditioner (AC) or Heat Pump (HP) size. This can prevent the system from operating efficiently or at all.

This fault indicates that the high-pressure safety switch has opened, signifying excessively high refrigerant pressure within the system. This causes a shutdown to prevent damage to the compressor.

This fault indicates that the low-pressure safety switch has opened, signaling that the refrigerant pressure in the system is too low. This can lead to system shutdown to protect the compressor.

This fault on a furnace indicates that a safety limit switch has tripped, usually due to excessive temperature within the unit. This causes the furnace to shut down to prevent damage.

This fault indicates a general problem with the furnace's ignition system. The furnace is unable to light the gas burner to produce heat.

This fault indicates a communication problem with the furnace's modulating gas valve. The control system is unable to send commands or receive feedback from the gas valve, affecting heating control.

This fault indicates a general control problem within the Fan Coil unit, specifically affecting the heater function. The system may prevent the heater from operating.

This critical fault indicates that the Fan Coil unit's heater is stuck in an 'on' state. This is a safety concern that can lead to overheating.

This fault indicates a problem with the blower motor in either the Furnace or Fan Coil unit. The blower is responsible for circulating air throughout your home, so its failure will stop heating or cooling.

This fault indicates a problem with the inducer motor in the furnace. The inducer motor draws combustion byproducts out of the furnace and ensures safe operation.

This fault indicates an unusual and potentially dangerous state where the Furnace's Low Pressure Switch (LPS) is open, but the High Pressure Switch (HPS) is closed. This suggests conflicting or incorrect pressure readings.

This fault indicates that the Fan Coil unit's control system is unable to establish communication with its blower component. This prevents proper air circulation.

This general fault code indicates an internal control board malfunction or error affecting various Carrier products like Furnace, Fan coil, GeoHP, Greenspeed/Extreme, and Infinity/Evolution ODU units. The system's main brain is experiencing an issue.

This fault indicates that the system experienced a brownout event, meaning a temporary drop in incoming 230V power. This can affect Infinity/Evolution ODU Two Capacity, 18VS,19VS/V-HP/AC, GeoHP, and Greenspeed/Extreme units.

This fault indicates that the Infinity/Evolution ODU Two Capacity or GeoHP unit is not receiving the required 230 volts of power. This will prevent the unit from operating.

This fault indicates a loss of communication with the inverter, primarily affecting Greenspeed/Extreme and 18VS,19VS/V-HP/AC systems. The inverter controls the variable speed compressor and fan.

This fault indicates that the compressor in an 18VS, 19VS/V-HP/AC unit has drawn excessive current, causing a safety shutdown. This protects the compressor from damage.

This fault indicates a problem with the outdoor air temperature sensor, affecting various systems including Furnace, Fan Coil, 18VS, 19VS/V-HP/AC, Greenspeed/Extreme, and Infinity/Evolution ODU units. The system cannot accurately read the outside temperature.

This fault indicates a problem with the suction temperature sensor, affecting Greenspeed/Extreme and 18VS,19VS/V-HP/AC systems. The system relies on this sensor for proper refrigerant cycle control.

This fault indicates a problem with the coil temperature sensor, affecting Infinity/Evolution ODU Two Capacity, 18VS,19VS/V-HP/AC, Greenspeed/Extreme, and Infinity/Evolution ODU Single Capacity units. The system cannot accurately monitor coil temperatures.

This fault indicates that a temperature sensor (OAT-OCT Thermistor for 18VS,19VS/V-HP/AC, Greenspeed/Extreme, or a general temp sensor for Infinity/Evolution ODU units) is reporting values outside its normal operating range. This means an invalid reading.

This fault specifically for GeoHP (Two Capacity) units indicates a problem with the freeze sensor. This sensor is critical for preventing the coil from freezing, especially in water-source heat pumps.

This fault specifically for Greenspeed/Extreme units indicates that the suction thermistor is reporting a temperature value outside its expected operating range. This could mean an inaccurate reading or a sensor malfunction.

This fault for 18VS,19VS/V-HP/AC units indicates that the discharge temperature sensor has detected a temperature outside its normal operating range. This protects the compressor from overheating.

This fault for 18VS,19VS/V-HP/AC units indicates an issue with the outdoor fan inverter. The inverter controls the speed and operation of the outdoor fan motor.

This fault for 18VS,19VS/V-HP/AC units indicates that the outdoor fan inverter has detected an excessively high internal temperature. This is a safety shutdown to prevent damage.

This fault for 18VS,19VS/V-HP/AC units indicates that the outdoor fan inverter has detected an excessive current draw by the fan motor. This is a safety shutdown.

This fault indicates that an auxiliary sensor connected to the SAM (System Access Module) has triggered an alert. This means the sensor has detected a condition outside its normal parameters.

This fault for 18VS,19VS/V-HP/AC units indicates that the system is operating at a reduced capacity due to low DC voltage. This limits the speed of components like the compressor or fans.

This fault specifically for 18VS,19VS/V-HP/AC units indicates that the outdoor fan has stopped operating or 'dropped out' unexpectedly. This can lead to overheating and system shutdown.

This fault for 18VS,19VS/V-HP/AC units indicates a problem with the stator heater. This heater is often used to keep the compressor windings warm, especially in cold weather, to prevent liquid refrigerant slugging.

This status indicates that the compressor sump heater on a Greenspeed/Extreme unit is actively engaged. This is normal operation in cooler temperatures to prevent liquid refrigerant from accumulating in the compressor oil.

This fault indicates an internal issue with the inverter or compressor in Greenspeed/Extreme or 18VS,19VS/V-HP/AC units. This is a critical failure that prevents the system from running.

This fault indicates that the Infinity/Evolution Outdoor Unit (ODU) has experienced a thermal cutout while operating in its low capacity stage. This is a safety measure to prevent overheating.