FAQs 

Here is a general listing of possible causes of oil failure trips:

• Low compressor oil level
• Refrigerant piping not designed or sized properly
• System has not been properly adjusted or balanced (Superheat)
• Improper refrigerant charge for low ambient operation
• Refrigerant migration
• Improper adjustment of system controls
• Electrical issues
• Internal compressor issues

To learn more, download Oil Pressure Problems in Refrigeration Systems

Superheat generally does not affect actual oil return to the compressor crankcase unless the superheat is set so high that it causes a starved condition resulting in low return gas velocity or evaporator icing. Low superheat at the compressor results in liquid refrigerant being present in the oil sump. The violent action of liquid refrigerant boiling in the crankcase will cause oil to be blown out into the system resulting in low oil levels. Liquid refrigerant in the compressor’s pressurized lubrication system will result in a loss of net oil pressure resulting in an oil failure trip, bearing damage due to the loss of lubrication to bearing surfaces and possible valve damage due to liquid slugging caused by the returning oil.

To learn more, download the Principles of Refrigeration Superheat.

These are typical symptoms of an improperly selected nozzle. Liquid temperature at the expansion valve not only affects nozzle selection but also affects the TEV selection since colder liquid has more capacity. Typically nozzles and expansion valves are selected based on the BTU capacity of the condensing unit divided by the number of evaporators, 95°F. ambient and 105°F. condensing with a 90°F to 95°F. degree liquid temperature. If the liquid temperature or the design condition change the selection may not be correct for the application. Consult an Application Engineer.

Maybe you missed air throw and air distribution. Evaporators are intended to be Non-ducted but airflow and throw is an important factor to consider. Usually unstable product temperatures are directly related to Evaporator coil selection, airflow restrictions and air throw.

My evaporator feeds okay for a while then the suction pressure drops to the point the low-pressure switch cycles the compressor off. For some reason the blockage clears on its own then repeats itself. I have changed the expansion valve but I still have the same problem. Is it possible to get two bad expansion valves in a row?

Chances are there was nothing wrong with the original valve. All indications point to a wet system. The expansion valve will feed until the saturated suction temperature reaches 32F the freezing point of water. The wet refrigerant and oil will block the TXV until the internal temperature reaches the melting point and the blockage clears. The remedy is good service and installation practices to ensure a clean dry system. Recover the refrigerant, replace the driers and oil if its POE, evacuate to 500 microns or less and recharge. This problem should go away provided the system is clean and dry.

1. Power board
2. Press Reset button until “DLY” is displayed
3. Unplug EEV from board
4. Power-down the board
5. Plug EEV back onto unpowered board after display decimals go dim

There could be many factors, but the most common is the transformer tap is not plugged into the spade that closest resembles the incoming voltage. Set the 208/240 tap on the transformer accordingly

All units sold by Heatcraft Refrigeration Products are covered under the standard catalog warranty. The basic terms of the standard catalog warranty is as follows:

• Products warranted for one year from date of original installation, or eighteen (18) months from date of original shipment, from Heatcraft Refrigeration Products, whichever occurs first.
• Replacement parts used on equipment past warranty terms are warranted for 1 year from date of installation.

To view all Warranty information, visit our Warranty page.

Whenever possible, replacement parts are to be obtained from a local authorized Heatcraft Refrigeration Products wholesaler. Replacement parts which are covered under the terms of our warranty statement will be reimbursed for total cost of the part only plus applicable taxes. The original invoice from the wholesale parts suppler must accompany all warranty claims for replacement parts reimbursement. Processing or handling fees assessed by parts wholesalers are not reimbursable under Heatcraft's warranty terms.

Contact your Heatcraft Refrigeration Sales Representative. If you need a contact, use our Find a Sales Rep

Send an e-mail with your name, company name, and phone number to [email protected] with the subject: Access2Answers Login Problem.

No. Our systems require only minor, well-documented modifications to switch from HFC-A1 to HFO-A2L. Single-refrigerant units, on the other hand, force full system replacements when HFCs phase out, or when you trigger “New” under today’s regulation. 

No. The design follows familiar refrigeration principles, and technicians can continue servicing units as they always have. The key difference is following A2L safety protocols when switching refrigerants. 

Our dual-refrigerant units are clearly labeled, ensuring contractors know when an A2L refrigerant requires an A2L mitigation control and sensor (RDS). 

Our R&D lab is UL-certified, and all dual-refrigerant systems undergo rigorous safety and compliance testing before release.

Heatcraft designed dual-refrigerant systems (HFC-A1 and HFO-A2L) to make refrigerant transitions easier for contractors, wholesalers and OEMs. This approach future-proofs customers against regulation changes while reducing inventory complexity and costs under today’s regulations. 

Waiting could lead to supply shortages, higher costs and rushed installations when HFCs phase out. Our dual-refrigerant approach allows customers to transition at their own pace without disruptions, and avoid having to buy a unit cooler or condensing unit, twice, when “New” is triggered after a repair. 

All manufacturers must comply with future standards. Our dual-refrigerant approach minimizes risk by reducing the need for multiple SKUs and ensuring flexibility as standards evolve. The dual-refrigerant design could be affected by future UL changes, positively or negatively, as is the case with all designs. 

The AIM Act was passed with bipartisan support, and HFC phasedown regulations are already in motion. Regardless of policy shifts, our dual-refrigerant units work with both A1 and A2L, keeping customers covered for the future. 

Our units support both A1 (HFC) and A2L (HFO) refrigerants. This allows customers to continue using familiar refrigerants while preparing for the industry shift to lower-GWP options. 

Distributors can reduce SKU complexity, optimize inventory, and offer a single system that meets multiple customer needs, rather than stocking separate A1 and A2L models. 

Change is coming, and waiting could lead to supply chain disruptions and higher costs. Heatcraft’s dual-refrigerant approach gives customers the flexibility to transition on their timeline without major financial risk. 

A2Ls are not new technology — they have been tested extensively and used globally. The industry is moving toward these refrigerants, and training resources are available to ensure a smooth transition. 

While timelines vary by application and state, the industry is shifting toward A2Ls. Major states like California are already mandating them, and EPA regulations under the AIM Act accelerate the transition.

The unit will still operate, but performance, efficiency and safety will be impacted. Proper labeling, training and handling procedures help prevent this mistake.