How much does reversing valve replacement cost?
$1,200–$2,200 installed in San Antonio. The part is $300–$600 and the labor is intense — 4–6 hours of refrigerant work. On older heat pumps we always quote replacement as an alternative.
San Antonio · Heat Pump Reversing Valve Replacement Repair · Family-Owned Since 1996
Heat Pump Won't Switch Between Heat And Cool? The Reversing Valve Is Stuck.
The reversing valve is what makes a heat pump a heat pump — it flips refrigerant flow to switch between cooling and heating. When it fails, you're stuck in one mode (or worse, mid-mode).
Typical price
$1,200–$2,200
Time to fix
4–6 hours
Urgency
High — system is stuck in wrong mode
In plain English — what's going on with your heat pump reversing valve replacement
A heat pump is just an air conditioner that can run in reverse to heat your house. The component that makes that reversal possible is the reversing valve — a big brass valve in the outdoor unit with a solenoid coil that slides an internal piston back and forth to change which way refrigerant flows.
When the valve sticks, you lose one mode entirely — usually heat (the solenoid is energized for cooling, de-energized for heating, so a failed solenoid leaves you stuck in heat mode). Or the valve sticks halfway and you get neither cooling nor heating, just refrigerant going in circles.
Replacement is $1,200–$2,200 — the valve itself is $300–$600, plus 4–6 hours to recover refrigerant, braze in the new valve under nitrogen purge, vacuum, and recharge. On older heat pumps (12+ years), we'll give you straight numbers on repair vs. system replacement.
What it costs in San Antonio
$1,200–$2,200 — Includes valve, brazing labor, nitrogen purge, vacuum, and refrigerant recharge. We'll quote replacement on older systems too. Our $59 diagnostic is waived when you approve the repair, so you only pay for the fix itself.
Symptoms you'll notice at home
If two or more of these sound familiar, it's probably your heat pump reversing valve replacement.
Heat pump won't switch from cool to heat (or vice versa)
Outdoor unit makes a loud 'whoosh' when changeover should happen
Heating works but with very weak output
Auxiliary heat strips running constantly because heat pump can't heat
Loud chattering or clicking from the reversing valve solenoid
Refrigerant pressures don't match either cool or heat mode
Why heat pump reversing valve replacements fail in San Antonio
- Solenoid coil failure (most common, easiest part to replace if just the coil).
- Internal valve seat wear from years of cycling.
- Debris in refrigerant from a prior compressor failure clogging the valve.
- Voltage spike or surge damage to the solenoid.
- Manufacturing defect (some brands had bad batches in specific years).
How we diagnose and replace it
Here's exactly what a Carnes and Sons tech does at your house — no mystery, no upselling.
- 1
Check solenoid first
Many 'reversing valve failures' are just the solenoid coil. We test the coil with a meter — if it's bad, $189 to replace just the coil instead of the whole valve.
- 2
Measure refrigerant pressures in both modes
Cool mode and heat mode have different pressure signatures. A stuck reversing valve has a unique fingerprint — wrong pressures for the called mode.
- 3
Recover refrigerant and replace valve
Full refrigerant recovery, cut out old valve, braze new one in under nitrogen purge to prevent oxidation. Slow, careful work — anything else damages the new valve.
- 4
Vacuum, recharge, and verify both modes
Pull deep vacuum, weigh in refrigerant to factory spec. Run system in BOTH cool and heat modes, verify proper changeover, document pressures.
What Your Neighbors Are Saying
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Heat Pump Reversing Valve Replacement questions San Antonio homeowners actually ask
Is it just the solenoid or the whole valve?
We check the solenoid first — it's a $189 fix if that's all that's wrong. If the valve body itself has failed, then it's the bigger job. We always start with the cheaper diagnostic.
Should I just replace the heat pump?
Depends on age and condition. Under 8 years old with otherwise good components — repair makes sense. Over 12 years old with other issues looming — replacement at $7,000–$10,000 is often the smarter long-term play. We'll show you the math.
Will it be covered by warranty?
If the system is under 10 years old and you have proof of regular maintenance, usually yes for parts. Labor is rarely covered. We always check before quoting.
How long does a reversing valve last?
15–25 years typically. Failures before 10 years usually point to a manufacturing defect or refrigerant contamination from a prior repair.
Why is the labor so expensive?
Brazing a reversing valve correctly requires nitrogen purge through the lines (otherwise oxide flakes contaminate everything downstream), proper torch technique on multiple joints in tight spaces, and a deep vacuum afterward to remove moisture. Rushing any step destroys the new valve within a year.
Can heat pumps still heat in San Antonio winters?
Yes — heat pumps work great in our mild winters. They struggle below 30°F (where auxiliary heat strips kick in), but San Antonio rarely sees that. A working heat pump is the cheapest heat you can run.
What if my heat pump won't heat at all?
Could be reversing valve, defrost board, low refrigerant, or compressor. We diagnose properly before condemning anything — too many techs just say 'reversing valve' without testing.
Serving heat pump reversing valve replacement repairs across the greater San Antonio area
We're based in Stone Oak and roll trucks across San Antonio and the surrounding Hill Country every day.
Carnes and Sons Air Conditioning
License TACLB29435E · Family-Owned Since 1996
401 E Sonterra Blvd Suite 375
San Antonio, TX 78258(210) 600-5091
San Antonio, TX 78258(210) 600-5091
Mon–Sat: 7AM – 8PM · Emergency same-day service
Cities & neighborhoods we serve
San Antonio · Stone Oak · Alamo Heights · Hollywood Park · Hill Country Village · Shavano Park · Castle Hills · Leon Valley · Helotes · Boerne · Fair Oaks Ranch · Bulverde · Timberwood Park · Garden Ridge · Schertz · Cibolo · Selma · Universal City · Live Oak · Converse · Windcrest · New Braunfels
Talk to a real person about your heat pump reversing valve replacement
No call center. The owner or one of his sons picks up.
(210) 600-5091