TROUBLESHOOTING

I. UNIT TROUBLESHOOTING

Refer to Tables 32-36.

Table 32 — LED Error Code Service Analysis

SYMPTOM

CAUSE

REMEDY

Hardware Failure

Loss of power to control module (IGC).

Check 5 amp fuse on IGC, power to unit, 24-v circuit breaker, and

(LED OFF)

 

transformer. Units without a 24-v circuit breaker have an internal

 

 

overload in the 24-v transformer. If the overload trips, allow

 

 

10 minutes for automatic reset.

Fan ON/OFF Delay Modified

High limit switch opens during heat

IGC board has modified either blower on delay time or blower off

(LED/FLASH)

exchanger warm-up period before fan-on

delay time.

 

delay expires.

 

 

Limit switch opens within three minutes

 

 

after blower-off delay timing in Heating mode.

 

Limit Switch Fault

High temperature limit switch is open.

Check the operation of the indoor (evaporator) fan motor.

(LED 2 Flashes)

 

Ensure that the supply-air temperature rise is in accordance with

 

 

the range on the unit nameplate.

Flame Sense Fault

The IGC sensed flame that should not be

Reset unit. If problem persists, replace control board.

(LED 3 Flashes)

present.

 

4 Consecutive Limit

Inadequate airflow to unit.

Check operation of indoor (evaporator) fan motor and that supply-air

Switch Faults

 

temperature rise agrees with range on unit nameplate information.

(LED 4 Flashes)

 

 

Ignition Lockout

Unit unsuccessfully attempted ignition for

Check ignitor and flame sensor electrode spacing, gaps, etc.

(LED 5 Flashes)

15 minutes.

Ensure that flame sense and ignition wires are properly routed

 

 

and terminated. Verify that unit is obtaining proper amount of gas.

Induced-Draft Motor Fault

IGC does not sense that induced-draft

Check for proper voltage. If motor is operating, check the

(LED 6 Flashes)

motor is operating.

speed sensor plug/IGC Terminal J2 connection. Proper

 

 

connection: PIN 1— White, PIN 2 — Red, PIN 3 — Black.

Rollout Switch Fault

Rollout switch has opened.

Rollout switch will automatically reset, but IGC will continue to

(LED 7 Flashes)

 

lock out unit. Check gas valve operation. Ensure that induced-

 

 

draft blower wheel is properly secured to motor shaft.

 

 

Reset unit at unit disconnect.

Internal Control Fault

Microprocessor has sensed an error in the

If error code is not cleared by resetting unit power, replace the IGC.

(LED 8 Flashes)

software or hardware.

 

Temporary Software

Electrical interference is impeding the IGC

Reset 24-v to control board or turn thermostat off and then on.

Lockout

software.

Fault will automatically reset itself in one hour.

(LED 9 Flashes)

 

 

CAUTION: If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that may be present before handling new control board. The IGC is sensitive to static electricity and may be damaged if the necessary pre- cautions are not taken.

IMPORTANT: Refer to heating troubleshooting for additional heating section troubleshooting information.

LEGEND

IGC — Integrated Gas Unit Controller

LED — Light-Emitting Diode

—45—

Page 44 Page 46
Page 45
Image 45
Bryant 581B Troubleshooting Unit Troubleshooting, LED Error Code Service Analysis, Symptom Cause Remedy, Led Off
Page 44 Page 46

581B specifications

The Bryant 581B is an innovative and highly efficient gas furnace that stands out in the HVAC market for its remarkable performance, reliability, and advanced features. Designed to provide optimal heating comfort, the Bryant 581B is perfect for homeowners seeking both quality and energy efficiency.

One of the main features of the Bryant 581B is its impressive Annual Fuel Utilization Efficiency (AFUE) rating. With an AFUE rating of up to 80%, this gas furnace maximizes energy usage, ensuring that a significant portion of the fuel is converted into heat for your home. This efficiency not only translates into lower energy bills but also reduces the carbon footprint, making it an environmentally friendly choice.

The furnace is equipped with a multi-speed blower motor that enhances comfort by providing consistent airflow throughout the home. This technology adjusts to different heating demands, ensuring that every room reaches the desired temperature without the discomfort of hot or cold spots. The quiet operation of the blower motor also adds to the overall comfort, creating a peaceful home environment.

Another notable characteristic of the Bryant 581B is its durable construction. It features a robust heat exchanger built from high-quality materials, designed to withstand the rigors of daily use. The compact design of the furnace allows it to fit seamlessly into various spaces, making it an ideal choice for both new installations and replacement projects.

The Bryant 581B also comes with advanced safety features, including a self-diagnostic control board that monitors the system's performance. This feature allows for easy troubleshooting and maintenance, prolonging the life of the furnace. Additionally, the furnace is equipped with an induced draft blower that enhances venting efficiency and safety by ensuring that combustion gases are safely expelled from the home.

For homeowners looking for enhanced control, the Bryant 581B is compatible with a range of smart thermostats, providing the ability to monitor and adjust heating settings remotely. This integration with smart technology ensures that homeowners can maintain their desired comfort levels while maximizing efficiency.

In conclusion, the Bryant 581B gas furnace is a top-tier option that combines efficiency, durability, and modern technology. With its high AFUE rating, multi-speed blower, and advanced safety features, it promises to deliver unparalleled comfort and peace of mind for years to come. Whether for a new build or an upgrade, the Bryant 581B is an investment that pays off in both comfort and savings.
Top Page Image Contents