Bryant Comfort Alert Diagnostic

Air or non-condensable gases in the refrigerant system can increase system pressure and cause inefficient operation, leading to excessive head pressure.

The control power supplied to the CADM is too low (below 19-28VAC), indicating a potential issue with the control transformer or its wiring.

This indicates a potential misreporting of the 'Welded Contactor' code. Confirm the Y terminal connection and voltage.

The system's discharge pressure is out of limits, or the compressor has overloaded. This is a LOCKOUT condition.

The compressor is running only for very brief periods. This is a LOCKOUT condition.

This indicates a potential misreporting of the 'Short Cycling' code. Verify the conditions related to compressor cycling and contactor wiring.

The compressor's rotor is locked, preventing it from starting or running. This is a LOCKOUT condition.

An open circuit has been detected in the system, preventing proper operation. This could be due to power supply issues or component failure.

This suggests a potential misreporting of 'Open Circuit' or 'Missing Phase' codes. Re-check sensor wiring and contactor connections.

One of the electrical phases required for compressor operation is missing. This is a LOCKOUT condition.

The electrical supply phases are reversed, causing the compressor to attempt to run backward. This is a LOCKOUT condition.

The compressor contactor has failed in the closed position, meaning the compressor will always run when power is supplied, regardless of the thermostat demand.

The control circuit voltage is below 18VAC, which is insufficient for proper operation of the module and system controls.

This indicates a short circuit or an over-current condition on the PROT terminal. The load on this circuit should not exceed 1 Amp.

The outdoor coil is blocked by debris, or the indoor air filter is dirty. This restricts airflow, causing the system to operate inefficiently and cycle improperly.

The compressor motor itself has failed (burned out or seized), or its internal overload protector has tripped, preventing it from starting even though the outdoor fan is operational.

The compressor motor is spinning in the reverse direction. This is common on 3-phase units and can cause loud, abnormal noises and inefficient operation.

The scroll plates within the compressor are damaged or worn. This can lead to inefficient compression and abnormally high suction pressure.

The flow of air over the outdoor coil is restricted, or the air is being recirculated. This prevents proper heat transfer and causes high head pressure.

The compressor itself is failing or has internal issues, causing it to cycle improperly instead of running normally to meet the thermostat's demand.

A component critical for the compressor's operation, such as a capacitor, overload protector, or start relay, is faulty, leading to incorrect cycling.

A component essential for starting the compressor, such as the start capacitor, run capacitor, overload protector, or start relay, has failed.

A critical control or starting component within the unit has failed, preventing the compressor and fan from operating.

The thermostat is not functioning correctly, sending inaccurate signals or failing to maintain set temperatures, causing the compressor to cycle improperly.

A clogged air filter restricts airflow through the indoor unit. This forces the system to run longer to try and reach the set temperature, leading to continuous operation.

The outdoor coil is dirty, preventing efficient heat rejection. This causes the refrigerant pressure and temperature to rise excessively, resulting in high head pressure.

A dirty outdoor coil or indoor return air filter is restricting airflow. This causes system pressure to build up excessively, leading to high head pressure.

A fault or shutdown condition in the indoor fan unit is preventing the necessary signals from reaching the outdoor unit (575J), which stops the compressor and fan from starting.

The motor or its associated capacitor for either the outdoor fan (in cooling mode) or indoor fan (in heating mode) is faulty, impacting the system's ability to maintain temperature and causing improper cycling.

The outdoor fan runs, but the compressor does not start due to faulty wiring or loose connections specifically within the compressor's electrical circuit.

The freeze-up protection thermostat has activated, sensing that the indoor coil is too cold and may be freezing over. This shuts down the compressor to prevent damage.

The safety devices designed to protect the unit's electrical system have activated, stopping the compressor and fan. This indicates an electrical issue that needs to be resolved.

The amount of heat the system is trying to remove (in cooling) or generate (in heating) is very high. This causes suction pressure to rise.

The system's high-pressure safety switch has activated due to excessive pressure in the refrigerant lines, stopping the compressor and fan to prevent damage.

The electrical connections to the unit are incorrect or have developed a fault, disrupting the control signals and power flow.

The voltage supplied to the unit is too low, causing the compressor to struggle and cycle incorrectly. This can lead to inefficient operation and potential damage.

The system's low-pressure safety switch has activated due to insufficient pressure in the refrigerant lines, stopping the compressor and fan. This often indicates a loss of refrigerant.

The system has insufficient refrigerant, often due to a leak. This results in lower than normal operating pressures, including low head pressure.

On a 3-phase unit, one of the three power supply lines is not receiving power, preventing the compressor from starting correctly.

The outdoor coil is dirty or its airflow is restricted. This prevents heat from being released effectively (in cooling) or absorbed efficiently (in heating), causing the unit to run continuously.

The unit is not receiving power, preventing the compressor and outdoor fan from starting. This could be due to an external power issue.

This indicates that the Comfort Alert Diagnostic Module (CADM) is receiving the necessary control power to operate.

The module is not receiving a constant power supply, causing it to power on and off intermittently. This often relates to how the 'Y' terminal is wired.

The module is not receiving power, which prevents it from monitoring the system or controlling the compressor.

The amount of refrigerant in the system is too high or too low. This disrupts normal operation, causing the compressor to cycle on and off erratically.

An overcharge of refrigerant increases system pressures, including suction pressure, beyond normal operating limits.

A Variable Frequency Drive (VFD) used in the 524J***H model has an address fault. This is preventing the system from starting correctly.

There is a blockage in the liquid refrigerant line, preventing proper flow. This can cause pressure drops and affect overall system performance.

There is a blockage within the refrigerant lines, such as in the filter drier or metering device. This prevents proper refrigerant flow, causing the compressor to cycle abnormally.

The thermostat's cooling setpoint is set very low, creating a high demand that requires the unit to run continuously to try and achieve it.

The thermostat is set to a temperature higher than the current indoor temperature, so it does not call for cooling. The compressor and fan will not start in this mode.

The module's built-in 3-minute anti-short cycle timer is active, preventing the compressor from restarting immediately to protect it from frequent cycling.

The TRIP LED is illuminated, but initial checks indicate the system and compressor appear to be functioning normally. This may point to a wiring or configuration issue.

The thermostat is calling for cooling (Y signal is present), but the compressor is not running. This indicates a protection mechanism has engaged or there's a power issue to the compressor.

The heating or cooling capacity of the unit is insufficient for the size of the area it is intended to condition. It must run constantly to try and meet the demand.