Allied Air Enterprises Upflow Troubleshooting, Fault Code History Button, High Heat State LED

TROUBLE SHOOTING With LED Indicator Assistance

Troubleshooting

Make the following visual checks before toubleshooting:

1.Check to see that the power to the furnace and the integrated ignition/blower control board is ON.

2.The manual shutoff valves in the gas line to the furnace must be open

3.Make sure all wiring connections are secure.

4.Review the Sequence of Operation (see page 23).

Start the system by setting thermostat above room temperature. Observe system response. Then use the information provided in this section to check the system operation.

The furnace has a built-in, self-diagnostic capability. If a system problem occurs, a fault code is shown by a red LED on the control board. The control continuously monitors its own operation and the operation of the system. If a failure occurs, the LED will indicate the failure code. The flash codes are presented in Table 9.

Fault Code History Button

The control stores the last five fault codes in memory. A pushbutton switch (fault code history switch) is located on the control (see Page 5). When the pushbutton switch is pressed and released, the control flashes the stored fault codes. The most recent fault code is flashed first; the oldest fault code is flashed last. To clear the fault code history, press and hold the pushbutton switch in for more than 5 seconds before releasing.

High Heat State LED

On these models, a green LED is provided on the control board to indicate high heat state (see Table 10).

CFM LED

An amber LED is provided on the control board to display CFM. To determine what CFM the motor is delivering at any time, count the number of times the amber LED flashes. Each flash signifies 100 CFM; count the flashes and multiply by 100 to determine the actual CFM delivered (for example: 10 flashes x 100 = 1000 CFM).

Table 9

Failure Codes - Red LED

LED	Fault Description
Status
LED Off	No power to control or control hardware fault
	detected
LED On	Normal operation
1 Flash	Flame present with gas valve off
2 Flashes	Pressure switch closed with inducer off
3 Flashes	Low-fire pressure, or IBS switch open
4 Flashes	High limit switch or rollout switch open
5 Flashes	Not used
6 Flashes	Pressure switch cycle lockout
7 Flashes	Lockout due to no ignition
8 Flashes	Lockout due to too many flame dropouts
9 Flashes	Incorrect polarity and phasing

Table 10

High Heat State - Green LED

LED	Description
Status
LED Off	No demand for high heat
LED On	High heat demand, operating normally
LED Flashing	High heat demand, high pressure switch not
	closed

20571201 Issue 0527 Page 26 of 28