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HVAC Express Parts
SKU: 4300040021
SHF-4-10L4 / 4300040021 Magnet Coil
Free Shipping In Stock$44.99 -
HVAC Express Parts
SKU: 17400516000851
YK-4.4/3.2-500-1 RoHS / 17400516000851 Pressure switch
Free Shipping In Stock$69.99 -
HVAC Express Parts
SKU: 17400306000053
R20035(AL) RoHS / 17400306000053 Reactor
Free Shipping In Stock$44.99 -
HVAC Express Parts
SKU: 11001010000063
YKB-2-2-6 RoHS / 11001010000063 Water pump
Free Shipping In Stock$69.99
Reversing Valves • Sensors • Switches • OEM Matched
Mini-Split Reversing Valves, Sensors & Switches
OEM-coded mini split reversing valves (4-way valves), solenoid coils, pressure switches, discharge temperature sensors, PFC reactors, and condensate pumps. All parts matched by OEM code for exact compatibility. In stock, ships same day.
- In Stock
- Same-Day Dispatch
- OEM Code Matched
- Source Unlisted Parts
Parts Available in This Category
- 4-way reversing valve — switches refrigerant flow direction between heating and cooling mode. Failure signs: unit stuck in one mode, refrigerant hiss bypassing the valve.
- Reversing valve solenoid coil — electrical actuator for the 4-way valve. Test the coil before replacing the valve body — the coil is significantly less expensive.
- High/low pressure switch — cuts compressor power on over-pressure or loss-of-charge. Stuck-open = continuous protection trips; stuck-closed = runs with low refrigerant.
- Discharge temperature sensor — monitors compressor discharge line. A faulty sensor triggers compressor over-temperature protection codes.
- PFC reactor (line choke) — power factor correction coil on the main board power supply. Failure can cause EMI issues or board shutdown.
- Condensate pump — removes drain water when gravity drain is not possible on wall-mounted indoor units.
Also see: Compressors · Control Boards · Fan Motors · Fan Blowers
FAQ: Mini-Split Reversing Valves & Sensors
How do I know if my mini split reversing valve is bad?⌄
Test the solenoid coil first — it's less expensive than the valve body.
Measure coil resistance (typically 100–400 Ω) and check for signal at the coil terminals when switching modes.
No signal = control board fault. Signal present but valve doesn't switch = coil or valve body.
Confirm a bad valve body by measuring suction and discharge pressures in both heating and cooling modes —
the pressures should swap when the mode changes.
My part isn't listed — can you source it?⌄
Yes — we regularly source unlisted OEM parts for HVAC contractors.
Contact us with the OEM part number and your unit model.