CONTROL DIAGNOSTICS

Troubleshooting

Make the following visual checks before troubleshooting:

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 31).

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 13

Fault Code History Button

The control stores the last five fault codes in memory. A pushbutton switch is located on the control (see Figure 40 on page 38). 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 A80UH2V and 80G1UH2V models, a green LED is provided on the control board to indicate high heat state (see Table 14).

CFM LED

On A80UH2V and 80G1UH2V models equipped with a variable speed motor, 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).

Failure Codes - Red LED

 

LED Status

Fault Description

 

 

 

 

 

 

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, rollout, or aux

 

 

limit switch open

 

 

 

 

 

 

 

 

 

4 Flashes

High limit 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 13

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 14

Page 36 of 41

Issue 1034

506471-01

Page 36
Image 36
Allied Air Enterprises A80UH2V Troubleshooting, Failure Codes Red LED, High Heat State Green LED, Led, Description Status

80G1UH2V, A80UH2V specifications

Allied Air Enterprises has made a significant mark in the HVAC industry with its innovative and high-performance heating and cooling solutions. Among its impressive lineup, the Allied Air Enterprises 80G1UH2V and A80UH2V models stand out for their efficiency, reliability, and advanced features.

The 80G1UH2V is a two-stage gas furnace that operates on natural gas or propane. With an efficiency rating of up to 80%, it provides excellent heating performance while contributing to cost savings on utility bills. Its durable cabinet design ensures long-lasting performance and protection from harsh weather conditions, making it ideal for a variety of home environments.

One of the key features of the 80G1UH2V is its two-stage heating capability. This technology allows the furnace to operate at a lower capacity to maintain consistent temperatures during milder weather, reducing energy consumption and noise. When the temperature drops significantly, the furnace automatically shifts to high capacity, delivering the required heat promptly. This flexibility not only creates a more comfortable living space but also enhances energy efficiency.

The A80UH2V model shares similar traits with the 80G1UH2V but offers some additional features. It includes a variable-speed blower motor that optimizes airflow throughout the home. This innovation not only increases comfort levels but also facilitates quieter operation. The A80UH2V's advanced control system provides precise temperature management and can be integrated easily with smart home systems for enhanced automation.

Both models are designed to operate quietly, with noise levels minimized through improved insulation and sound-dampening technologies. This makes them suitable for residential applications, where comfort and peace are a priority. Additionally, they come equipped with a self-diagnostic control board that makes troubleshooting and maintenance simpler and more efficient.

Durability is another critical characteristic of both the 80G1UH2V and A80UH2V. They feature a robust heat exchanger made from high-quality materials, enhancing longevity and reliability. With these models, homeowners can expect reliable performance for years with minimal upkeep.

In summary, the Allied Air Enterprises 80G1UH2V and A80UH2V models deliver exceptional heating solutions through advanced technology, efficiency, and reliability. Their innovative features cater to the modern homeowner's need for comfort, control, and energy savings, making them excellent choices for residential heating needs.