Uploaded July 2025 | Updated September 2026, 3 weeks ago
Struggling with TXV (Thermostatic Expansion Valve) diagnosis? This comprehensive video breaks down the essential techniques every HVAC technician needs to master for accurate system troubleshooting.
What You'll Learn:
Key Diagnostic Rules:
When subcool readings allow TXV diagnosis
The critical superheat thresholds (normal vs. problematic)
How to use split temperatures to confirm your diagnosis
Troubleshooting:
How to test if a TXV is actually stuck vs. slightly restricted
The hand-on-bulb test technique for verification
Distinguishing between TXV failure and compressor slipping
Open TXV scenarios and what they reveal
Real-World Applications:
Compressor slipping vs. TXV overfeed diagnosis
Airflow issues that mimic TXV problems
When adding refrigerant helps vs. when it doesn't
Tips Covered:
Why superheat alone isn't enough for diagnosis
Using subcool readings as your diagnostic gateway
The importance of split temperature verification
Heat pump mode testing for stuck TXVs
This isn't just theory - we break down real scenarios you'll encounter in the field and give you the systematic approach to get it right every time.
HVAC school playlist with all our TXV videos: youtube.com/playlist?list=PLjmMtP2_3aVvWs-zk_pSh1SrJcqt5rpLS
HVAC school podcasts on TXV:
hvacrschool.com/podcasts/txv-troubleshooting-w-trevor
hvacrschool.com/podcasts/txv-power-element-power-head-short-110-2
hvacrschool.com/podcasts/txv-bulb-placement-short-109-2
hvacrschool.com/podcasts/how-a-txv-works-and-why-i-call-it-a-csv
#HVAC #TXV #Superheat #Subcool #HVACDiagnosis #HVACTraining #HVACTech #troubleshooting
Read all the tech tips, take the quizzes, and find our handy calculators at hvacrschool.com or the HVAC School Mobile App on the Google Play Store (hvacrschool.com/play-store) or App Store (hvacrschool.com/app-store).
Struggling with TXV (Thermostatic Expansion Valve) diagnosis? This comprehensive video breaks down the essential techniques every HVAC technician needs to master for accurate system troubleshooting.
What You'll Learn:
Key Diagnostic Rules:
When subcool readings allow TXV diagnosis
The critical superheat thresholds (normal vs. problematic)
How to use split temperatures to confirm your diagnosis
Troubleshooting:
How to test if a TXV is actually stuck vs. slightly restricted
The hand-on-bulb test technique for verification
Distinguishing between TXV failure and compressor slipping
Open TXV scenarios and what they reveal
Real-World Applications:
Compressor slipping vs. TXV overfeed diagnosis
Airflow issues that mimic TXV problems
When adding refrigerant helps vs. when it doesn't
Tips Covered:
Why superheat alone isn't enough for diagnosis
Using subcool readings as your diagnostic gateway
The importance of split temperature verification
Heat pump mode testing for stuck TXVs
This isn't just theory - we break down real scenarios you'll encounter in the field and give you the systematic approach to get it right every time.
HVAC school playlist with all our TXV videos: youtube.com/playlist?list=PLjmMtP2_3aVvWs-zk_pSh1SrJcqt5rpLS
HVAC school podcasts on TXV:
hvacrschool.com/podcasts/txv-troubleshooting-w-trevor
hvacrschool.com/podcasts/txv-power-element-power-head-short-110-2
hvacrschool.com/podcasts/txv-bulb-placement-short-109-2
hvacrschool.com/podcasts/how-a-txv-works-and-why-i-call-it-a-csv
#HVAC #TXV #Superheat #Subcool #HVACDiagnosis #HVACTraining #HVACTech #troubleshooting
Read all the tech tips, take the quizzes, and find our handy calculators at hvacrschool.com or the HVAC School Mobile App on the Google Play Store (hvacrschool.com/play-store) or App Store (hvacrschool.com/app-store).
