Replace a Reversing-Valve Solenoid Coil (Heat Pump)

Coil-only job — the solenoid coil slides off the valve stem, so NO recovery and NO brazing. Confirm the coil (not the valve) is the fault, match the coil voltage (24 V) and position, slide the new coil on, and verify the valve audibly shifts on a call.

Approx. 30 min

Before you start

•Coil confirmed as the fault: open/shorted coil on ohms, or it gets 24 V on a call but the pilot solenoid won't move the valve — while the valve body itself is mechanically fine.
•Replacement solenoid COIL that matches the voltage (almost always 24 V) and fits the valve stem; this is a coil swap, not a valve change — no refrigerant work.
•Power can be killed at the disconnect and a meter is available.

Tools & materials

Multimeter (coil ohms, 24 V at the coil) · Nut driver for the coil retainer nut/clip · Replacement 24 V solenoid coil

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Isolate & remove

Kill power, verify 0 V
Pull the disconnect and verify 0 V at the coil leads before removing it. No refrigerant recovery is needed — you are not opening the sealed system.
Tools: Multimeter
⚠ Verify 0 V at the coil leads; no system opening, so no recovery/brazing.
Slide the old coil off the stem
Remove the retainer nut/clip at the top of the valve stem and slide the coil straight off the pilot-solenoid stem. The valve body stays sealed and charged.
Target: Coil slides off the stem — valve body untouched, system stays sealed

Match & install

Match the coil voltage and orientation
Confirm the new coil is the correct voltage (24 V) and fits the stem. Slide it on in the same orientation and secure the retainer nut/clip — snug, so it doesn't buzz or walk off.
Target: 24 V coil, correct fit/orientation, retainer secure

Verify the valve shifts

Confirm the valve audibly shifts on a call
Restore power and command the mode that energizes the valve (cooling or defrost on an O-energized system). Confirm 24 V at the coil and listen/feel for the valve to thunk over and the pipe temperatures to swap (hot gas line changes). No shift with good voltage = a stuck valve, not the coil.
Tools: Multimeter
Target: 24 V at coil; valve audibly shifts; suction/discharge sides swap with mode