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Tech Tips:

When I started in the field, I was a 17-year-old helper with one year of tech school under my belt. In other words, I knew nothing. As I've mentioned before, a few experienced techs took me under their wings at different stages, but the most influential was a guy named Dave Barefoot. For whatever reason, […]

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Podcasts:

LIVE From the ACCA Conference 2024

This episode was recorded live on location at the 2024 ACCA conference in Orlando. Bryan starts by interviewing Marissa Reddy, a co-founder of Conduit Tech, a software company providing load calculation and sales tools for HVAC contractors. Marissa shares insights into what it takes for contractors to successfully adopt new technology in their businesses. […]

HVAC Business Best Practices Series (Podcast)

The week of 3/5/2017 was “Business week” on the HVAC school podcast and we talked about a full range of business topics. Here are our business-related episodes. As always, if you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Why Maintenance Agreements Matter and How to […]

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How to Evacuate an AC system, Full Vacuum Procedure

Our latest Podcast

HVAC School – For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

In this short podcast, Roman Baugh takes over with his new series, “The Deep End,” where he shares tech support conversations. This time, Roman is on the other end of a live tech support call about a grounded compressor with an existing Mitsubishi mini-split (Mr. Slim heat pump). The unit in this case had an unclear service history due to the homeowner moving in recently.

In this issue, the compressor kicked on and kicked off immediately. After the technician in this scenario told tech support that he had no continuity from the compressor to ground, tech support asked him to check the resistance (which was 43 ohms from black to ground and 43 from white to ground). Tech support concluded that the compressor was grounded, and it needed to be replaced (along with the PCB). However, the resistance disappeared mid-call, and intermittent resistance readings don’t always indicate a failed winding; it’s worth noting that cool ambient temperatures that enable liquid refrigerant to migrate into the compressor could potentially skew electrical readings.

Roman recommended shutting the system down and trying to get the system to run. His rationale was that if the unit ran and didn’t keep stopping, the system may have been overcharged or lacking a crankcase heater. However, that did not show any improvement in operation; the compressor rattled for about a second and shut off. A resistance test confirmed that the compressor was grounded, pointing to a mechanical issue with the compressor and not just a one-off instance of refrigerant migration. This type of failure can happen when there are repeated instances of liquid refrigerant in the crankcase over time.

Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.

Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.

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Search Episodes

The Deep End with Roman Baugh: Live Call, Grounded Compressor, Mitsubishi Mini-Split

06/02/2026

Bryan Orr

Add Duct Renovations to Your Product Offerings

05/28/2026

Bryan Orr