Introduction
This manual provides essential information for the installation, operation, and maintenance of the ERP LH680014 Furnace Flame Sensor. This component is designed as an aftermarket replacement part for various furnace systems. Proper installation and handling are crucial for safe and efficient operation.
Compatibility: This sensor is an aftermarket replacement compatible with various models, including but not limited to ERLH680014, LH680534, LH33WZ517, LH680012, LH680014, LH33WZ511, LH33WZ515, LH33WZ521, and 10-681.
Safety Information
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Always disconnect power to the furnace before attempting any installation, maintenance, or repair. Failure to do so can result in electric shock, property damage, or serious injury. It is recommended that installation and service be performed by a qualified technician.
Wear appropriate personal protective equipment (PPE) such as gloves and eye protection during installation and handling.
Product Overview
The ERP LH680014 is a furnace flame sensor, a critical safety device in gas-fired heating systems. Its primary function is to detect the presence of a flame in the combustion chamber. If a flame is not detected when the gas valve is open, the sensor signals the control board to shut off the gas supply, preventing the accumulation of unburnt gas.
Figure 1: The ERP LH680014 Furnace Flame Sensor. This image displays the ceramic insulator, the metal rod that extends into the flame, and the wire connector for electrical connection to the furnace control board.
Setup and Installation
- Power Disconnection: Turn off all electrical power to the furnace at the main circuit breaker or fuse box. Verify power is off using a voltage tester.
- Locate Existing Sensor: Identify the current flame sensor in your furnace. It is typically located in the path of the burner flame, often near the igniter.
- Disconnect Wiring: Carefully disconnect the wire connected to the existing flame sensor. Note its orientation for reinstallation.
- Remove Old Sensor: Unscrew or unclip the old flame sensor from its mounting bracket.
- Install New Sensor: Mount the new ERP LH680014 flame sensor in the same position and orientation as the old one. Ensure it is securely fastened.
- Connect Wiring: Reconnect the wire to the new flame sensor. Ensure a snug and secure electrical connection.
- Restore Power: Once installation is complete and all connections are secure, restore power to the furnace.
- Test Operation: Initiate a heating cycle to verify proper furnace operation and flame sensor functionality. Observe the ignition sequence to ensure the flame is detected and maintained.
If you are unsure about any step, consult a qualified HVAC technician.
Operating Principles
The flame sensor operates on the principle of flame rectification. When the flame is present, it completes an electrical circuit between the sensor rod and the grounded burner assembly. The flame acts as a conductor, allowing a small electrical current to flow. The furnace control board monitors this current. If the current is detected, the board knows the flame is lit and keeps the gas valve open. If the current is not detected within a specified time, the control board assumes there is no flame and shuts off the gas supply for safety.
Maintenance
Regular maintenance of your furnace, including the flame sensor, can help ensure reliable operation and extend the life of the component. It is recommended to have your furnace inspected annually by a qualified technician.
- Cleaning: Over time, the flame sensor rod can accumulate carbon deposits, which can interfere with its ability to detect the flame. If the sensor appears dirty, carefully remove it (following the power disconnection steps in the installation section) and gently clean the ceramic insulator and metal rod with fine-grit sandpaper or steel wool. Avoid bending the rod.
- Inspection: Periodically inspect the sensor for any signs of damage, such as cracks in the ceramic or corrosion on the metal rod. Ensure the wiring connection is secure and free from corrosion.
- Professional Service: For comprehensive maintenance and safety checks, schedule professional furnace servicing.
Troubleshooting
If your furnace is experiencing issues related to flame detection, the flame sensor may be a contributing factor. Common symptoms include:
- Furnace ignites, runs for a short period, then shuts off (short cycling).
- Furnace attempts to ignite but fails, then locks out.
- Error codes on the furnace control board related to flame sensing.
Troubleshooting Steps:
- Check for Power: Ensure the furnace has power and the thermostat is calling for heat.
- Inspect and Clean Sensor: Follow the cleaning instructions in the Maintenance section. A dirty sensor is a common cause of flame detection issues.
- Verify Wiring: Ensure the wire connected to the flame sensor is secure and not damaged.
- Check Grounding: Ensure the burner assembly and furnace chassis have proper grounding.
- Consult Technician: If issues persist after basic troubleshooting, contact a qualified HVAC technician for diagnosis and repair. The problem may lie with other components such as the igniter, gas valve, or control board.
Specifications
| Manufacturer | ERP |
| Part Number | LH680014 |
| Item Weight | 0.494 ounces |
| Package Dimensions | 7 x 7 x 5 inches |
| Item Package Quantity | 1 |
| Batteries Required | No |
| ASIN | B0746PY985 |
| Date First Available | October 30, 2012 |
Warranty and Support
For information regarding warranty coverage or technical support for the ERP LH680014 Furnace Flame Sensor, please refer to the original purchase documentation or contact the retailer/manufacturer directly. Keep your proof of purchase for warranty claims.
