Bryant 310AAV instruction manual Troubleshooting Guide

START

Is LED status light on?

YES

NO			NO
	Is there 115V at L1 and L2?			Is door switch closed?
		YES			YES
			NO
	Is there 24V at SEC-1 and SEC-2?			Is there 115V going to switch?
		YES			YES
	Replace furnace control.			Replace door switch.

NO

NO

Is door switch closed?

Is circuit breaker closed?

YES

Check for continuity in wire from circuit breaker to furnace.

NO

49

Fig. 49 ---Troubleshooting Guide

Is LED status light blinking rapidly without a pause?

NO

Is 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?

Go to section below for the status code that was flashed.

YES	Check for correct line voltage polarity. If units		Replace transformer.
	are twinned, check for proper low-voltage
	(24V) transformer phasing.
NO	To recall status code briefly remove and reconnect one RED wire from the draft
	safeguard switch to display stored status code. On RED LED control do not
	remove power or blower access panel before initiating status code recall. You
	can also recall the previous status code by momentarily shorting the TEST/TWIN
	terminal to Com24V terminal until the LED goes out. LED will flash the status
	code of the previous fault or status code #11 (1 short and 1 long flash) if there
	was no previous fault. After the control repeats the code 4 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 FAN speed (AMBER LED
	boards only) HEAT speed, and COOL speed will run for 10 – 15 seconds each.
	Gas valve and humidifier will not be turned on.
YES			Does the control respond to W, Y1 (if present),
	Was there a previous status code	NO
	other than #11?		Y/Y2, and G (24V) thermostat signals?

YES

Run system through a heating or cooling cycle to check operation. Status codes are erased after 72 hours. On RED LED boards stored status codes can also be erased whenever (115V or 24V) is interrupted.

Replace furnace control.

Close circuit breaker and go back to START.

	Check room thermostat or
	interconnecting cable.
		NO
NO
	Is 24V present at W, Y1 (if present), Y/Y2 or
	G thermostat terminals on the furnace control?

YES

Disconnect all the thermostat wires from the furnace control.

YES	Does the problem repeat when using
	a jumper wire?
		NO

The thermostat is not compatible with the furnace control. Either install a ballast resistor, connect the Com24V thermostat terminal to the thermostat, or replace the thermostat.

A02106a

310AAV