Carrier 790-37021 Power Supply Board
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The Carrier 790‑37021 is a power supply board used in HVAC control units and furnace controllers to regulate DC output for relays, timers, and sensor interfaces. Common failures on this board include burnt or cracked capacitors, shorted voltage regulator ICs, and degraded MOSFETs that cause over‑voltage spikes or loss of power to downstream modules. Start diagnostics by verifying the 24 VAC input to the board, measuring the regulated DC rail for proper voltage and ripple, and inspecting for visible component damage or solder bridges; then check I/O signals to the control logic and review any fault codes from the HVAC system’s diagnostic display.[oss-gpt-20b] |
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We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.
- ⚙️ Fast Diagnostics – Same-day evaluation available
- 🔁 Reliable Turnaround – Most jobs ship within 5–10 business days
- 🧰 Expert Technicians – Decades of board-level experience
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- 🔧 Board-level diagnostics (shorts, VRM, memory, fan, thermals)
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- ✅ 1-Year warranty on completed repairs
Free Estimates • Industrial-grade testing • 1-Year Warranty • Nationwide Service
Other Repaired Units by Carrier
Carrier CEPL130349-01 Control BoardCarrier 790-37021 Power Supply BoardCarrier CEPL130349-01 Control BoardContact Us
🚑Shop Location🛠️
Industrial Electronic Repair
145 Rockwell Place Ct
Tobaccoville, NC 27050
🚑 Rush repair shipments only — no walk-ins.
📞Phone
📦Mailing Address🚛
Industrial Electronic Repair
931-E S. Main St #204
Kernersville, NC 27284
📦 Mailing Address (for invoices or shipped repairs)
No walk-ins accepted.