1. Introduction
This manual provides essential information for the safe and correct installation, operation, and maintenance of the Carrier HK42FZ035 OEM Replacement Furnace Control Board. This board is designed as a direct replacement for specific Carrier furnace models. Please read this manual thoroughly before proceeding with any installation or service to ensure proper function and safety.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Consult a qualified installer, service agency, or the gas supplier for information or assistance.
- Always disconnect electrical power to the furnace before installing or servicing the control board. Failure to do so can result in electrical shock or death.
- Ensure all wiring connections are secure and comply with local and national electrical codes.
- Do not operate the furnace with damaged wiring or components.
- This control board contains sensitive electronic components. Handle with care to avoid damage from electrostatic discharge.
3. Setup and Installation
Before beginning installation, ensure the replacement board is compatible with your furnace model. Refer to your furnace's original documentation for specific compatibility requirements.
3.1 Pre-Installation Steps
- Turn off all electrical power to the furnace at the main service panel.
- Turn off the gas supply to the furnace.
- Carefully disconnect all wires from the existing control board, noting their positions for correct re-connection. It is recommended to take a photograph of the existing wiring configuration.
- Remove the old control board from the furnace.
3.2 Installing the New Control Board
Figure 1: Carrier HK42FZ035 OEM Replacement Furnace Control Board. This image displays the green circuit board with various electronic components, relays, and terminal blocks for wiring connections.
- Mount the new HK42FZ035 control board in the same location as the old board, ensuring it is securely fastened.
- Reconnect all wires to the new control board according to the notes or photographs taken during removal. Pay close attention to terminal labels such as 'COM 24VAC', 'EAC-1', 'EAC-2', and various relay connections.
- Verify all connections are tight and correctly seated.
- Ensure no wires are pinched or obstructing moving parts.
4. Operating Instructions
After installation, restore power and gas to the furnace. The control board will initiate a self-check sequence. Observe the status indicator light (if present) for any error codes.
4.1 Initial Power-Up
- Restore gas supply to the furnace.
- Restore electrical power to the furnace at the main service panel.
- The furnace control board will perform a diagnostic check.
- Set the thermostat to call for heat to test the furnace operation.
4.2 DIP Switch Settings
The HK42FZ035 board may feature DIP switches for configuring specific furnace parameters, such as blower speeds or timing sequences. Refer to your furnace's original wiring diagram and specifications for the correct DIP switch settings for your particular system. Incorrect settings can lead to improper furnace operation or damage.
5. Maintenance
The HK42FZ035 control board is designed for reliable operation and generally requires minimal maintenance. However, periodic inspection is recommended.
- Annual Inspection: During routine furnace maintenance, have a qualified technician inspect the control board for any signs of overheating, corrosion, or loose connections.
- Cleaning: Ensure the area around the control board is free from dust and debris. Do not use liquid cleaners directly on the board.
6. Troubleshooting
If the furnace is not operating correctly after control board replacement, consider the following common issues:
| Symptom | Possible Cause | Solution |
|---|---|---|
| Furnace does not power on | No electrical power; loose wiring; blown fuse | Check circuit breaker; verify wiring connections; inspect furnace fuses. |
| Burners do not ignite | No gas supply; faulty igniter; incorrect thermostat setting | Ensure gas valve is open; check igniter for damage; verify thermostat is calling for heat. |
| Blower motor not running | Incorrect DIP switch settings; faulty motor; wiring issue | Review DIP switch settings; check blower motor wiring. |
| Status light indicates error | Specific fault detected by the board | Consult your furnace's service manual for specific error code interpretations and troubleshooting steps. |
If troubleshooting steps do not resolve the issue, contact a qualified HVAC technician.
7. Specifications
- Model: HK42FZ035
- Manufacturer: Carrier (OEM Replacement)
- Product Dimensions: Approximately 6 x 6 x 6 inches
- Product Weight: Approximately 2 Pounds
- ASIN: B00FPP5J4W
- Date First Available: October 8, 2013
8. Warranty Information
This HK42FZ035 control board is an OEM replacement part. Warranty coverage for OEM replacement parts typically varies by seller and manufacturer. Please refer to the specific warranty terms provided by your point of purchase or the original equipment manufacturer for details regarding coverage, duration, and claims procedures.
9. Technical Support
For technical assistance or further inquiries regarding the Carrier HK42FZ035 OEM Replacement Furnace Control Board, please contact the supplier or a qualified HVAC professional. Always provide the model number (HK42FZ035) when seeking support.