Master-Bilt Freezer and Refrigerator Troubleshooting

/ Commercial Freezers, Commercial Refrigeration, Troubleshooting / March 1

Master-Bilt Freezer and Refrigerator Troubleshooting

When it comes to freezing or cooling ingredients, Master-Bilt is one of the best in business. They manufacture a large line of commercial reach-in freezers, refrigerators and merchandisers used everywhere from restaurants to grocery stores.

Have an issue that’s popped up recently? Don’t sweat it. We have Master-Bilt freezer and refrigeration troubleshooting tips for popular models, including BLG/TLG Display Cases, BMG/TMG Glass Door Refrigerators, MBGFP Glass Door Freezers, IHC Flash Freezers and HOAM/VOAM Open Air Merchandisers.

Click Issues Below for More Info:


Warm Cabinet

When the pressure is normal but the cabinet is warm, check for the issues below:

Master-Bilt IHC-27 Freezer-Master-Bilt Freezer and Refrigerator Troubleshooting

                         IHC-27 Freezer



  • Coil frosted over – The evaporator coil might be blocked with frost. See potential causes and resolutions below.

  • Control set too warm – The temperature control might have been set too high. Check the operation’s manual for the correct setting.

  • Undercharged refrigerant – The refrigerant in the unit could be undercharged. Have an authorized technician handle the issue.

High Head & Back Pressure

When there is high head and back pressure on the unit, look for the following:


  • Obstructed condenser coil – Check if the condenser coil is restricted or clogged with dust or grime. Cleaning the condenser coil at least every three months can help avoid this issue.

  • Faulty fan motor – A defective condenser fan motor could be causing high head and back pressure. Have an authorized technician replace the motor.

  • Air in the refrigeration system – There could be air present in the system that is effecting pressure. Have an authorized technician handle the issue.

  • Overcharged refrigerant – The refrigerant can be overcharged on the unit. Have an authorized technician handle the issue.

Low Head & Back Pressure

If there is low head and back pressure on the unit, check for the following:


  • Restricted system – Check for an obstruction or restriction in the refrigeration system. Look for restrictions in the expansion valve or capillary tube.

  • Leak in the system – A refrigerant leak could be causing pressure problems. Have an authorized technician handle the issue.

  • Undercharged refrigerant – The refrigerant in the unit could be undercharged. Have an authorized technician handle the issue.

Not Cycling & Coil Covered with Ice

If the unit isn’t cycling and the coil is blocked with frost, see if the following issues are present:


  • Temperature control broken or incorrectly set – The temperature control could be broken or the settings are incorrect. Have an authorized technician handle the issue if broken.

  • Obstructed condenser – Check if the condenser is restricted or clogged with dust or grime. Cleaning the condenser coil at least every three months can help avoid this issue.

  • Faulty fan motor – A defective condenser fan motor could be causing high head and back pressure. Have an authorized technician replace the motor.

  • Open door or broken gasket – Air could be escaping the unit if the door is open or the gasket is broken. Make sure to shut the door or have the gasket repaired.

  • Broken defrost heater (freezer only) – The defrost heater could be broken. Have it replaced or repaired by an authorized technician.

  • Location is too warm – The ambient temperature could be too hot (higher than 75 degrees), or the unit is positioned in direct sunlight. Try to lower the temperature or move the unit to a cooler spot.
    Master-Bilt BMG-48 Merchandiser-Master-Bilt Freezer and Refrigerator Troubleshooting

                        BMG-48 Merchandiser


  • Overcharged refrigerant – The refrigerant can be overcharged on the unit. Have an authorized technician handle the issue.

Compressor Won’t Start

When the compressor hums but cycles on overload, look for the potential causes below:


  • Low voltage – There could be a low voltage of power supplied to the unit.

  • Faulty components – See if the relay, overload protector or capacitor are broken. Have an authorized technician repair or replace any of these parts.

  • High head pressure – High head pressure will cause the compressor not to start. See potential causes and resolutions above.

  • Dropped 3 phase – Have an authorized technician repair the issue.

Compressor Cycles on Overload

If the compressor start and runs but ends up cycling on overload, check for the following:


  • Low voltage – There could be a low voltage of power supplied to the unit.

  • Faulty components – See if the relay, overload protector or start capacitor are broken. Have an authorized technician repair or replace any of these parts.

  • High head pressure – High head pressure will cause the compressor not to start. See potential causes and resolutions above.

Check out our selection of Master-Bilt manuals for additional troubleshooting and maintenance help.

Please contact a local authorized service agent who can help with these specific units and all your commercial kitchen equipment needs.


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