When you're working long hours in the field, cabin comfort isn't a luxury — it's a necessity. Whether you're harvesting under the hot sun or planting on chilly mornings, your tractor’s HVAC system needs to work reliably. So when the HVAC control board fails, it affects more than just comfort — it affects productivity.
At UpFix, we repair HVAC control boards for tractors, combines, and other agricultural equipment to ensure your cab stays climate-controlled in all seasons — without the need for costly replacement parts.
🧊 Common Symptoms of HVAC Control Board Failure
These modules control fans, temperature settings, compressor signals, and blend doors. When they go bad, you might notice:
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No fan or blower operation
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AC compressor not turning on
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Incorrect temperature output (too hot or too cold)
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Unresponsive buttons or knobs
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Fan stuck at one speed or not adjusting
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No power to the HVAC system at all
These symptoms can seem like sensor or wiring problems — but they’re often traced back to a failing HVAC control board.
🛑 Common Error Codes / Messages:
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CAB HVAC ERR 01 – No comm with HVAC controller
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TEMP SENSOR FAIL
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FAN CONTROL ERROR
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SPN 520211 FMI 7 – HVAC output failure
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“HVAC System Offline”
🔧 Common Symptoms:
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No fan/blower operation
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AC not blowing cold / no heat
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Fan stuck on one speed
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Temperature settings not responding
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Cabin too hot or cold despite setting
🔍 What Causes HVAC Module Failure?
HVAC boards operate under a tough environment — vibration, moisture, and heat all contribute to failure over time. Common causes include:
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🔥 Burned relays from switching high current
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💧 Corroded circuits due to condensation or cab leaks
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⚡ Blown resistors or capacitors
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🌡️ Faulty temperature sensor feedback
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🔌 Cracked solder joints from years of vibration
Fortunately, most of these issues are fully repairable — and we fix them every day at UpFix.
🛠️ How We Repair HVAC Control Boards
When your HVAC board arrives at our facility, here’s what happens:
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We diagnose the board using specialized equipment
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Replace damaged relays, resistors, capacitors, or ICs
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Resolder or repair cracked joints or burned traces
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Clean corrosion and seal vulnerable areas
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Perform simulated testing to ensure full function
You get back a reliable, plug-and-play board — no need for reprogramming or calibration in most cases.
🚜 Equipment & Brands We Support
We repair HVAC boards from all major ag brands, including:
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John Deere
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Case IH
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New Holland
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Kubota
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Massey Ferguson
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Fendt, AGCO, Challenger, and others
If you don’t see your part on our website, we likely still support it.
👉 Submit a Custom Repair Request
✅ Why UpFix?
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Save up to 80% vs. replacing the HVAC board
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Fast turnaround — usually 2–5 business days
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No hidden fees — if we can’t fix it, you only pay for return shipping
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Tested & guaranteed to restore in-cab climate control
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Trusted since 2006 by farmers, dealers, and equipment operators nationwide
📦 Ready to Repair?
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Ship your HVAC control board to us using the provided label
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We diagnose, repair, and test it
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You reinstall it and get back to work — cool in summer, warm in winter
📞 Have a Question?
Text or call us at 888-979-9343
Or contact us online anytime:
👉 Contact Us
💡 Don’t Sweat It (or Freeze) — Let UpFix Fix Your HVAC
Field work is hard enough without battling heat or cold in the cab. Let UpFix restore your HVAC system to factory function and keep you comfortable, no matter the weather.