Bryant GB1AAV, Service And Maintenance Instructions

Is circuit breaker closed? 

Close door switch and go to start.

Is red LED status light on?

Is door switch closed?

Is red LED status light blinking

rapidly without a pause?

Is there 115v going to switch?

Replace door switch.

Replace control center.

Replace transformer.

Is red LED status light blinking

ON/OFF slowly with a

combination of short and long

flashes?    

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.

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.

Once status code is determined,

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?

Does control respond to W, Y,

or G 24-vac thermostat signals?

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.

Go to section with status code

determined.

Is there 115v at L1 and L2?

Close circuit breaker and

go back to start.

Check for continuity in wire from circuit

breaker to furnace.

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

NO

YES

YES

YES

START

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

NO

Is 24 vac present at W, Y, or G

terminals on the control?

Replace control if it does not

respond to 24-vac signal at W, Y,

or G screw terminals.

Check room thermostat or

interconnecting cable.

YES

NO

NO

TROUBLESHOOTING GUIDE

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