Troubleshooting Guide

START

Is red LED status light on?

YES

Is there 115v at L1 and L2?		NO
Is there 115v at L1 and L2?

	YES
		NO

Is there 24v at SEC-1 and SEC-2?
Is there 24v at SEC-1 and SEC-2?

	YES

Replace control center.

Is door switch closed?		NO

	YES
		NO

Is there 115v going to switch?
Is there 115v going to switch?

YES

Replace door switch.

Replace transformer.

Close door switch and go to start.

Is circuit breaker closed?			NO
Is circuit breaker closed?

	YES

		Close circuit breaker and
		go back to start.

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Is red LED status light blinking rapidly without a pause?

Is red LED status light blinking ON/OFF slowly with a combination of short and long flashes?

YES

Determine status code. The status code is a 2 digit number with the first digit determined by the number of short flashes and the second digit by the number of long flashes.

YES

Check for correct line voltage polarity. If units are twinned, check for proper low-voltage (24v) transformer phasing.

Check for previous fault by momentarily shorting the TEST terminal and the C terminal until the LED goes out. LED will flash the status code of any previous fault or the code No. 11 (1 short and 1 long flash) if no previous fault. After the control repeats the code 3 times, the control will go through a brief component test sequence. The inducer will start and run for the entire component test. The HSI, blower motor heat speed, and blower motor cool speed will run for 10-15 sec each.

Was there a previous fault code other than No. 11?

YES

Does control respond to W, Y,		NO
or G 24-vac thermostat signals?

	YES

Check for continuity in wire from circuit breaker to furnace.

Check room thermostat or interconnecting cable.

Is 24 vac present at W, Y, or G terminals on the control?

YES

Go to section with status code determined.

Run system through a heating or

cooling cycle to check operation.

Status codes are erased after 48

hrs or whenever power (115v

or 24v) is interrupted.

Replace control if it does not respond to 24-vac signal at W, Y, or G screw terminals.

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393AAV specifications

The Bryant 393AAV is a high-efficiency gas furnace designed to deliver reliable heating performance for residential applications. Crafted for homeowners seeking both comfort and energy savings, this model combines advanced technology with robust features to ensure optimal indoor climate control.

One of the standout characteristics of the Bryant 393AAV is its variable-speed ECM blower motor. This innovative motor allows for smooth and quiet operation while also enhancing energy efficiency. By adjusting its speed based on the heating demands of the home, the unit promotes consistent temperatures and improved airflow, ensuring that every room is evenly heated.

The furnace has an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%, making it one of the most efficient options available. This high AFUE rating signifies that a significant portion of the fuel consumed is converted into usable heat, leading to reduced utility bills and a smaller carbon footprint. The 393AAV’s two-stage gas valve further contributes to its efficiency. By operating at a lower capacity during milder conditions and switching to a higher capacity when temperatures drop, this feature allows homeowners to enjoy a comfortable environment while minimizing energy consumption.

In terms of durability, the Bryant 393AAV is built to last. It features a corrosion-resistant heat exchanger constructed from premium materials to withstand the test of time. Additionally, the furnace is equipped with a reliable ignition system, ensuring safe and efficient startup with each heating cycle. The design includes an insulated cabinet that not only reduces noise levels but also improves energy efficiency by minimizing heat loss.

Installation and maintenance of the Bryant 393AAV are user-friendly. The unit has a compact design that makes it easier to fit into various spaces within the home. Regular maintenance is facilitated through access panels that allow technicians to reach key components with ease, promoting longevity and sustained performance.

In conclusion, the Bryant 393AAV is a modern gas furnace that excels in efficiency, comfort, and reliability. With features like a variable-speed blower motor, high AFUE ratings, and a robust design, homeowners can trust this unit to provide consistent heating while helping to reduce overall energy costs. This furnace is an excellent choice for those looking to invest in a heating solution that aligns with both comfort and sustainability goals.

Bryant 393AAV instruction manual Troubleshooting Guide

Models: 393AAV