How to Reset a Fenwal Ignition Module: Simple Steps

If your HVAC system is experiencing ignition issues, the Fenwal ignition module could be the culprit. This essential component controls the ignition sequence in your furnace or heating system, ensuring proper burner operation. When it malfunctions, it can prevent the system from starting or cause shutdowns. Thankfully, many issues can be resolved with a simple reset. In this guide, we’ll walk you through six easy steps to reset your Fenwal ignition module, whether manually or automatically, helping you restore your system’s functionality quickly and effectively.

6 Simple Steps to Reset a Fenwal Ignition Module for HVAC Systems

Here are 6 simple steps to reset your Fenwal ignition module for HVAC systems and get your heating back on track quickly.

Step 1: Turn Off Power to the HVAC System

• Turn off the power switch on your HVAC unit. This is typically found on the furnace or air handler.

• Alternatively, flip the circuit breaker that controls power to the HVAC system.

Step 2: Locate the Fenwal Ignition Module

Next, you need to find the Fenwal ignition module within your HVAC system. It’s often located near the burner assembly or control board. The module is typically a rectangular or square box with multiple wire connections. Check your unit’s manual if you're unsure of its exact location.

Step 3: Observe the LED Indicator for Error Codes

The LED light in Fenwal ignition modules flashes in various patterns to show different types of problems. If your module has an LED, look for the flash pattern, as it can help you identify the problem.

• Flashing error codes: A flashing LED could mean that the appliance has not ignited, there is an issue with the gas, or a sensor issue.

• Solid or steady light: A steady light is normal, but if the light does not change, it may mean there is a more serious problem.

Before doing a reset, consult the user manual to figure out the flash codes and identify the issue.

Step 4: Manual Reset Procedure

If you're ready to proceed with a manual reset, follow these steps:

1. Wait for a few minutes: After turning off the power, leave it off for about 3-5 minutes to allow any stored charge in the ignition module to dissipate.

2. Flip the power switch back on: After waiting, turn the HVAC power switch back on or restore power by flipping the circuit breaker.

3. Press the reset button: Some Fenwal models feature a reset button. Find this button, which is usually located near the LED, and press it. This will reset the module, and the LED should stop blinking or turn steady to show that the module is working fine.

If your module doesn’t have a reset button, simply cycling the power (turning it off and on) should reset the system.

Step 5: Automatic Reset (If Applicable)

Some Fenwal ignition modules are equipped with an automatic reset feature. This feature attempts to reset the system automatically after a certain period if the thermostat continues to call for heat. If your module has this feature, it will automatically reset after a set duration, such as 1 hour or 5 minutes.

Once the module resets, it will try to ignite the burner again without requiring manual intervention.

Step 6: Lockout Recovery

In some cases, the Fenwal ignition module may enter a non-volatile lockout state. This means the lockout is retained even after the power is removed, and the system will not automatically reset. To recover from a lockout:

• Use an external reset input, if available on your model. Some Fenwal modules have a dedicated terminal for this purpose.

• A reset will cause the lockout indicator to go out and the LED to gradually illuminate, indicating that the system is prepared for a fresh call for heat.

Troubleshooting Additional Issues

Here are some additional troubleshooting tips if your Fenwal ignition module does not reset or if you have other problems:

• Check the flame sensor: if it is unclean or faulty, no ignition will take place. If it is worn out, clean it or replace it.

• Check the gas supply: Make sure that the gas valve is open and there is no blockage in the gas line.

• Check the burner: The burner may be clogged or dirty, which hinders ignition. Clear away any debris that might be obstructing the burner.

• Check for loose or damaged wiring: The wiring that is connected to the ignition module should be checked for any signs of damage or separation.

Resetting your Fenwal ignition module can quickly resolve many HVAC ignition issues. Following the steps will help restore your system’s functionality. It is advisable to perform periodical maintenance to avoid such issues; if such problems occur, consult with a professional specialist.

Written by Allen Rode for PartsHnC, your trusted source for high-quality HVAC parts, including water heater components, air conditioner parts, and heat pump solutions