Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.
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Factory Authorized Parts™ HK42FZ027 Circuit Board | Integrated Furnace Control | Single-Stage HSI OEM Logic Module
Factory Authorized Parts™ HK42FZ027 Circuit Board | Integrated Furnace Control | Single-Stage HSI OEM Logic Module
Low stock: 1 left
Factory Authorized Parts™ - HK42FZ027 Furnace Control Circuit Board
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Restore Reliable Heating: Eliminate intermittent furnace lockouts and "no-heat" calls with this factory-programmed control module.
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Simplified Diagnostics: The onboard LED status light provides real-time feedback on system health and helps identify failed components quickly.
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Enhanced Safety Protection: Microprocessor-based flame sensing ensures the gas valve only remains open when a safe combustion flame is present.
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Optimized Blower Timing: Precision fan-off delays maximize heat extraction from the heat exchanger, increasing overall home comfort.
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Direct OEM Replacement: Avoid the mounting and wiring headaches of universal boards by using the exact factory-authorized service part.
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Specifications
Specifications
Product Details
- Brand: Factory Authorized Parts™ (Carrier/Bryant/Payne)
- Manufacturer: Carrier Global Corporation
- Part #: HK42FZ027
- Weight: 0.85 lbs
- Voltage: 24 VAC (Control) / 120 VAC (Line)
- Ignition Type: Hot Surface Ignition (HSI)
- Blower Speeds: Supports Multi-Speed PSC Blower Motors
- Fuse Protection: 3A Automotive-style plug-in fuse
description
description
Factory Authorized Parts™ HK42FZ027 Circuit Board | Integrated Furnace Control | Single-Stage HSI OEM Logic Module
The Factory Authorized Parts™ HK42FZ027 serves as the primary "brain" of your heating system, meticulously managing every phase of the furnace’s operation. This OEM-focused integrated furnace control (IFC) is the specific hardware responsible for orchestrating the ignition sequence—from the initial inducer draft and Hot Surface Ignitor (HSI) warm-up to the final blower fan-off delay. Specifically engineered for Carrier, Bryant, and Payne single-stage furnace series, this board ensures the "body" of the furnace communicates perfectly with the thermostat. By replacing a malfunctioning or "blind" board with the HK42FZ027, you restore the system's ability to monitor safety limits and flame rectification, preventing dangerous gas buildup and ensuring peak heating efficiency.
Key Features
- Genuine OEM Logic Control: Specifically engineered to replace part number HK42FZ027, maintaining factory-spec timing for the inducer, ignitor, and blower motor.
- Integrated Safety Monitoring: Continuously scans the high-limit switches, rollout sensors, and pressure switches to ensure the system shuts down instantly if a fault is detected.
- Microprocessor Troubleshooting: Features an onboard diagnostic LED that flashes specific fault codes, allowing for rapid and accurate system troubleshooting.
- Relay & Noise Resolution: Includes heavy-duty onboard relays designed to fix issues with "clicking" controls or blowers that fail to engage after the heat cycle starts.
- Plug-and-Play Compatibility: Designed with exact-match multi-pin molex connectors and spade terminals to ensure a secure, error-free connection to the factory wiring harness.
Product Details
- Brand: Factory Authorized Parts™ (Carrier/Bryant/Payne)
- Manufacturer: Carrier Global Corporation
- Part #: HK42FZ027
- Weight: 0.85 lbs
- Voltage: 24 VAC (Control) / 120 VAC (Line)
- Ignition Type: Hot Surface Ignition (HSI)
- Blower Speeds: Supports Multi-Speed PSC Blower Motors
- Fuse Protection: 3A Automotive-style plug-in fuse
🛠️ HVAC Depot Pro Tip
Take a Picture First: Before disconnecting any wires from the old board, photograph the entire layout—specifically the individual wires on the "Park," "Heat," and "Cool" terminals. These are easily mixed up during the swap. Conduct a diagnostic check by verifying the 3A fuse on the new board is seated firmly; if the furnace has a low-voltage short in the thermostat wiring, this fuse will pop instantly to protect the new HK42FZ027 from permanent damage. Always handle the board by the edges to avoid static discharge to the sensitive microchips.
Cross-Reference
- Superseded / Legacy: HK42FZ011, HK42FZ014, HK42FZ017, HK42FZ021
- Drawing / OEM Equivalents: 1012-920, 1012-83-9201, 1191-83-9201A
- White-Rodgers/Emerson Equivalents: 50A55-843 (Universal equivalent)
- Brand Equivalents: Carrier, Bryant, Payne, Day & Night, Totaline
Model Compatibility
- Carrier 58 Series (Suffixes: 58STA, 58STX, 58WAV, 58PAV, 58MXA, 58MXB)
- Bryant 300 Series (Suffixes: 310AAV, 310JAV, 311AAV, 311JAV, 340MAV, 350MAV)
- Payne PG8/PG9 Series (Suffixes: PG8MAA, PG8JAA, PG9MAA, PG9MAB)
- Standard Units (Suffixes: 395CAV, 373LAV, 376CAV, 383KAV)
Specification
Specification
Refund policy
Refund policy
Our refund and returns policy lasts 30 days. If 30 days have passed since your purchase, we can’t offer you a full refund or exchange. Please note there will be a 20% Re-stocking fee of product price.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Model and serial number must match what is on the invoice and correct box information.
Exclusions:
• Part with obvious signs of use of installation.
• Original box was destroyed or could not be located by purchaser.
• Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
• Any item that is returned more than 30 days after delivery
Part installation
HVAC Parts and Equipment Depot recommend this parts will be installed by a licensed professional contractor. HVAC Parts and Equipment Depot assumes no liability for any injuries or damages arising from the user information or products.
Sale items
Only regular priced items may be refunded. Sale items cannot be refunded. Special Order items cannot be refunded.
Exchanges
We only replace items if they are defective or damaged from Manufactory. If you need to exchange it for the same item, send us an email at hvacpartsstore@gmail.com and send your item to: HVAC Parts & Equipment Depot 1135 E Plano Parkway Suite 8 Plano Tx 75189.
Refunds
To complete your return, we require a receipt or proof of purchase within 30 days or less.
Once your return is received and inspected by management team, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7-14 Business days. HVAC Parts and Equipment Depot or its employees are not responsible for damaged items from manufactory.
Shipping returns
To return your product, you should mail your product to:
HVAC Parts & Equipment Depot
1135 E Plano Parkway Suite 8 Plano Tx 75074.
Customer will be responsible for paying for shipping. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you may vary.
If you are returning more expensive items, you may consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item without a valid tracking number provided by your choice of delivery method.
Late or missing refunds
If you haven’t received a refund yet, first check your bank account again. This process takes approximately 7-14 business days depending on your Bank.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at hvacpartsstore@gmail.com
Special Orders
Special orders should be picked up within 30 Days of purchase day. Your items will be considered abandoned and will be returned to manufacturer. There will be a 100% Re-stocking fee for abandoned items.
Need help?
Contact us via email hvacpartsstore@gmail.com or Phone 214-734-5222 for questions related to refunds and returns.
Thank you for choosing HVAC Parts & Equipment Depot.
Our refund and returns policy lasts 30 days. If 30 days have passed since your purchase, we can’t offer you a full refund or exchange. Please note there will be a 20% Re-stocking fee of product price.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Model and serial number must match what is on the invoice and correct box information.
Exclusions:
• Part with obvious signs of use of installation.
• Original box was destroyed or could not be located by purchaser.
• Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
• Any item that is returned more than 30 days after delivery
Part installation
HVAC Parts and Equipment Depot recommend this parts will be installed by a licensed professional contractor. HVAC Parts and Equipment Depot assumes no liability for any injuries or damages arising from the user information or products.
Sale items
Only regular priced items may be refunded. Sale items cannot be refunded. Special Order items cannot be refunded.
Exchanges
We only replace items if they are defective or damaged from Manufactory. If you need to exchange it for the same item, send us an email at hvacpartsstore@gmail.com and send your item to: HVAC Parts & Equipment Depot 1135 E Plano Parkway Suite 8 Plano Tx 75189.
Refunds
To complete your return, we require a receipt or proof of purchase within 30 days or less.
Once your return is received and inspected by management team, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7-14 Business days. HVAC Parts and Equipment Depot or its employees are not responsible for damaged items from manufactory.
Shipping returns
To return your product, you should mail your product to:
HVAC Parts & Equipment Depot
1135 E Plano Parkway Suite 8 Plano Tx 75074.
Customer will be responsible for paying for shipping. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you may vary.
If you are returning more expensive items, you may consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item without a valid tracking number provided by your choice of delivery method.
Late or missing refunds
If you haven’t received a refund yet, first check your bank account again. This process takes approximately 7-14 business days depending on your Bank.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at hvacpartsstore@gmail.com
Special Orders
Special orders should be picked up within 30 Days of purchase day. Your items will be considered abandoned and will be returned to manufacturer. There will be a 100% Re-stocking fee for abandoned items.
Need help?
Contact us via email hvacpartsstore@gmail.com or Phone 214-734-5222 for questions related to refunds and returns.
Thank you for choosing HVAC Parts & Equipment Depot.
Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.

Happy Shouts From Our Thrilled Customers
William Bartlett
Cecil really saved me with troubleshooting tips over the phone. Thought I was going to have to replace the blower motor and ended up only needing a motor run capcitor. Thank you and God bless!
Riley Connolly
Cecil and Fidel were absolutely amazing and so helpful. We were happy they were open on Sunday, but was impressed with their knowledge and willingness to make sure we had everything we needed. If you need parts or service or install, I would recommend.
Cole Meger
Our AC went out during the hottest stretch of summer, and with a one-year-old at home, we were desperate for a quick fix. These guys came through big time — not only did they source the part faster than anyone else in the area, they also walked me through DIY troubleshooting while I waited. Trustworthy, knowledgeable, and run by a solid local family. As someone who owns rental properties nearby, I’ll be sourcing all my HVAC parts from them moving forward. Highly recommend!
Carl T. Droste
Had a power outage last night and during the 100 degree heat today noticed that the AC was not blowing any cold air. Pulled the capacitors to have them checked and also took video of the relay making noise even with the breaker was off. The proprietor and her staff were very friendly and helpful. She had the video analyzed and confirmed something was wrong. She checked one of the capacitors was a little low. Capacitor replacement is the biggest ticket item for HVAC repair. It is hundreds of dollars with the a capacitor only about $20.
Fuzzy Wuzzy
Cecil and his family have been a life saver. I walked in with very little knowledge on parts let alone how to repair my unit. All I had was my brother in FL who knows more than I do and Cecil at HVAC Depot. With 2 young kids at home I couldn't afford to wait for a HVAC tech. Cecil walked me through what I needed to know, even after hours when the shop closed. I successfully repaired the fan motor and replaced the capacitor. Thank you HVAC team for being totally awesome. Prices were amazing and I'm forever going to support this small family business. You and your family are what Texas is all about!!!
Linda Robinson
I called HVAC Depot and was absolutely blown away by the fast, courteous and exceptional service. They were very knowledgeable about explaining what they were doing and what had happened to the ac system. If you ever need a HVAC team they are best and they won’t hesitate by coming out and they won’t leave until you are happy with the service. Thank you so much for your excellent service. Kudos to you Michelle for your amazing customer service.
Paul Hamer
My AC went out in our home on Friday night. I went out and got the capacitor details and took them here first thing Saturday morning. Lady at the counter was friendly and had the capacitor I needed! When I got home, I installed the capacitor and AC is all good!!
Jeff Ledesma
Awesome support and had everything I needed for an older unit! Then helped me out with the DIY!! Air conditioning back up and running at 100%!!
Thanks for everything
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HVAC Parts and Equipment Depot
Frequently Asked Questions
Questions? We’ve got you covered
We are open to the public! Homeowners, landlords, and DIYers are all welcome—no license required.
We carry blower motors, fan motors, capacitors, control boards, contactors, thermostats, filters, copper lines, refrigerants, and more.
Yes, we stock OEM and compatible replacement parts for major brands including Trane, Goodman, Lennox, Carrier, Rheem, and others.
Absolutely! Bring in the part, model number, or a picture, and our team will help match you with the correct replacement.
Yes, we accept returns or exchanges within a set time period—just make sure the item is unused and in original packaging. Ask for specific terms at the counter.
While we don't install, we can answer basic questions and refer you to trusted local HVAC technicians if needed.
We sell certain refrigerants, but EPA regulations require certification for purchase of products like R-410A or R-22.
We offer both! You can shop in person or call to arrange shipping if you're out of town.