Master-Bilt Controller Troubleshooting

Cause

Solution

1. Faulty transducer
2. Transducer out of range
3. Loose wire connection
4. Incorrect hook-up

1. Have pressure transducer replaced
2. Turn the power off for a few seconds, then turn it back on
3. Have connections tightened
4. Have wiring inspected

Cause

Solution

1. Damaged sensor
2. Loose wire connection
3. Overheated sensor
4. Sensor is out of range

1. Have sensor replaced
2. Have connections tightened
3. Take out sensor during brazing
4. Install sensor after brazing

Cause

Solution

1. Damaged sensor
2. Loose wire connection
3. Overheated sensor
4. Sensor is out of range

1. Have sensor replaced
2. Have connections tightened
3. Take out sensor during brazing
4. Install sensor after brazing

Cause

Solution

1. Superheat setting is set too low
2. TS2 in wrong locations
3. Loose sensors
4. Uneven feeding of coil circuits
5. Refrigerant is overcharged
6. Electric expansion valve (EEV) is defective
7. Compressor has stopped

1. Change the setpoint
2. Have the distributor inspected
3. Have sensors insulated with foam tape
4. Have refrigerant charged correctly
5. Have EEV wiring inspected
6. Have EEV replaced
7. Have compressor inspected

Cause

Solution

1. Insufficient refrigerant
2. Heat load is too large
3. Compressor failure OR high pressure cuts out
4. Evaporator fans aren’t running
5. Door has been open too long
6. Coil is iced up

1. Have refrigerant checked and replaced if necessary
2. Have compressor replaced
3. Have evaporator fan serviced
4. Make sure the door is closed during refrigeration
5. Check for air leaks through walls of cold room
6. Allow coil to defrost

Cause

Solution

1. Incorrect temperature setting
2. Improperly designed system

1. Change the temperature setting
2. Select a system that works better for your purposes

Cause

Solution

1. Mechanical damage
2. Loose wire connection
3. Overheating
4. Sensor is out of range

1. Have controller inspected by authorized service technician
2. Have connections tightened
3. Allow the sensor to cool down before next use
4. Have sensor replaced

Cause

Solution

1. Refrigerant is leaking
2. Faulty pressure transducer

1. Have leak fixed
2. Have transducer replaced

Cause

Solution

1. RJ-45 connection is loose
2. Communication port failure

1. Have connector replaced
2. Have controller board replaced

Cause

Solution

1. Faulty transducer
2. Transducer out of range
3. Loose wire connection
4. Incorrect hook-up

1. Have pressure transducer replaced
2. Turn the power off for a few seconds, then turn it back on
3. Have connections tightened
4. Have wiring inspected

Cause

Solution

1. Damaged sensor
2. Loose wire connection
3. Overheated sensor
4. Sensor is out of range

1. Have sensor replaced
2. Have connections tightened
3. Take out sensor during brazing
4. Install sensor after brazing

Cause

Solution

1. Damaged sensor
2. Loose wire connection
3. Overheated sensor
4. Sensor is out of range

1. Have sensor replaced
2. Have connections tightened
3. Take out sensor during brazing
4. Install sensor after brazing

Cause

Solution

1. Superheat setting is set too low
2. TS2 in wrong locations
3. Loose sensors
4. Uneven feeding of coil circuits
5. Refrigerant is overcharged
6. Electric expansion valve (EEV) is defective
7. Compressor has stopped

1. Change the setpoint
2. Have the distributor inspected
3. Have sensors insulated with foam tape
4. Have refrigerant charged correctly
5. Have EEV wiring inspected
6. Have EEV replaced
7. Have compressor inspected

Cause

Solution

1. Insufficient refrigerant
2. Heat load is too large
3. Compressor failure OR high pressure cuts out
4. Evaporator fans aren’t running
5. Door has been open too long
6. Coil is iced up

1. Have refrigerant checked and replaced if necessary
2. Have compressor replaced
3. Have evaporator fan serviced
4. Make sure the door is closed during refrigeration
5. Check for air leaks through walls of cold room

Cause

Solution

1. Incorrect temperature setting
2. Improperly designed system

1. Change the temperature setting
2. Select a system that works better for your purposes

Cause

Solution

1. Mechanical damage
2. Loose wire connection
3. Overheating
4. Sensor is out of range

1. Have controller inspected by authorized service technician
2. Have connections tightened
3. Allow the sensor to cool down before next use
4. Have sensor replaced

Cause

Solution

1. Refrigerant is leaking
2. Faulty pressure transducer

1. Have leak fixed
2. Have transducer replaced

Cause

Solution

1. RJ-45 connection is loose
2. Communication port failure

1. Have connector replaced
2. Have controller board replaced