We’re giving the HVAC School community a better place to talk shop.
Think of the useful parts of an old trade forum: a question you can find again, photos that help explain the job, people who will tell you what they know—and what they don’t.
This is for working HVACR and building performance people. Technicians, contractors, consultants, specialists, and instructors. Residential, commercial, refrigeration, controls, airflow, moisture, and the building around the equipment.
Start with what you’re seeing. Share a photo. Ask for a second set of eyes. Bring back something you learned at the symposium. When you find the answer, close the loop so the next person can learn from it.
Disagree with the diagnosis. Explain your reasoning. Treat the person with respect. No pile-ons, customer ridicule, or hidden sales pitches.
Your existing HVAC School account works here. Earlier posts remain in the searchable community archive. Pick a room, introduce the work you do, or bring a question from your day.
For techs. By techs.
Bryan Orr
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Bryan Orr
@bryanorrMitsubishi Bulletin 2336: Leak sensor placement on horizontal R-454B air handlers Mitsubishi Electric Trane HVAC US (METUS) sent out Bulletin 2336 on September 8 about refrigerant leak sensor failures on certain R-454B air handlers installed horizontal left or horizontal right. The issue: if the sensor stays in its factory shipping position, condensate from the indoor coil can drip onto it. METUS found water inside failed sensors. That can damage the sensor and disable refrigerant leak detection. The sensor needs to be moved during horizontal installation, following the unit’s installation manual. METUS is asking contractors to review affected horizontal installations and correct the sensor location where needed. A damaged sensor may need replacement. The affected-model list covers specific SVZ-AP, PVA-AA, PVFY-L, PVFY-M, TPVFYP, RVZ-AP, and RVZ-AP-M models. Check the exact model and code in the resolution PDF. Manufacturer PDFs: • Bulletin 2336: http://news.mehvac.com/bulletins/bulletin-2336.pdf • Resolution details and affected models: http://news.mehvac.com/bulletins/qar28_svz_pva_sensor_relocation.pdf Future production will include an added warning notice with a QR code for the relocation instructions. For units already in the field, use the installation manual for the correct sensor position. If you’ve been replacing these sensors on horizontal installs, this is worth a look before putting another sensor in the same spot.
Mitsubishi Bulletin 2336: Leak sensor placement on horizontal R-454B air handlers Mitsubishi Electric Trane HVAC US (METUS) sent out Bulletin 2336 on September 8 about refrigerant leak sensor failures on certain R-454B air handlers installed horizontal left or horizontal right. The issue: if the sensor stays in its factory shipping position, condensate from the indoor coil can drip onto it. METUS found water inside failed sensors. That can damage the sensor and disable refrigerant leak detection. The sensor needs to be moved during horizontal installation, following the unit’s installation manual. METUS is asking contractors to review affected horizontal installations and correct the sensor location where needed. A damaged sensor may need replacement. The affected-model list covers specific SVZ-AP, PVA-AA, PVFY-L, PVFY-M, TPVFYP, RVZ-AP, and RVZ-AP-M models. Check the exact model and code in the resolution PDF. Manufacturer PDFs: • Bulletin 2336: http://news.mehvac.com/bulletins/bulletin-2336.pdf • Resolution details and affected models: http://news.mehvac.com/bulletins/qar28_svz_pva_sensor_relocation.pdf Future production will include an added warning notice with a QR code for the relocation instructions. For units already in the field, use the installation manual for the correct sensor position. If you’ve been replacing these sensors on horizontal installs, this is worth a look before putting another sensor in the same spot.
Bryan Orr
@bryanorrWe’re giving the HVAC School community a better place to talk shop. Think of the useful parts of an old trade forum: a question you can find again, photos that help explain the job, people who will tell you what they know—and what they don’t. This is for working HVACR and building performance people. Technicians, contractors, consultants, specialists, and instructors. Residential, commercial, refrigeration, controls, airflow, moisture, and the building around the equipment. Start with what you’re seeing. Share a photo. Ask for a second set of eyes. Bring back something you learned at the symposium. When you find the answer, close the loop so the next person can learn from it. Disagree with the diagnosis. Explain your reasoning. Treat the person with respect. No pile-ons, customer ridicule, or hidden sales pitches. Your existing HVAC School account works here. Earlier posts remain in the searchable community archive. Pick a room, introduce the work you do, or bring a question from your day. For techs. By techs.
We’re giving the HVAC School community a better place to talk shop. Think of the useful parts of an old trade forum: a question you can find again, photos that help explain the job, people who will tell you what they know—and what they don’t. This is for working HVACR and building performance people. Technicians, contractors, consultants, specialists, and instructors. Residential, commercial, refrigeration, controls, airflow, moisture, and the building around the equipment. Start with what you’re seeing. Share a photo. Ask for a second set of eyes. Bring back something you learned at the symposium. When you find the answer, close the loop so the next person can learn from it. Disagree with the diagnosis. Explain your reasoning. Treat the person with respect. No pile-ons, customer ridicule, or hidden sales pitches. Your existing HVAC School account works here. Earlier posts remain in the searchable community archive. Pick a room, introduce the work you do, or bring a question from your day. For techs. By techs.
Bryan Orr
@bryanorrThe 8th Annual HVAC/R Training Symposium is January 13–14, 2027, at the Ocoee Lakeshore Center and Bill Breeze Park in Ocoee, Florida. The event brings tradespeople together for HVAC science, system and duct design, moisture management, commissioning, demonstrations, and conversations you can take back to work. Use this room to talk about what you want to learn and to continue useful conversations afterward. The official event page is the place for current ticket, schedule, streaming, and credit details: https://www.hvacrschool.com/events/8th-annual-hvac-r-training-symposium/ For account or ticket support, use the assistance information on the event page rather than posting private account details here.
The 8th Annual HVAC/R Training Symposium is January 13–14, 2027, at the Ocoee Lakeshore Center and Bill Breeze Park in Ocoee, Florida. The event brings tradespeople together for HVAC science, system and duct design, moisture management, commissioning, demonstrations, and conversations you can take back to work. Use this room to talk about what you want to learn and to continue useful conversations afterward. The official event page is the place for current ticket, schedule, streaming, and credit details: https://www.hvacrschool.com/events/8th-annual-hvac-r-training-symposium/ For account or ticket support, use the assistance information on the event page rather than posting private account details here.
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