52 Probe Error MP4000

Description 

Probe Error 

• Occurs during pretrip (PTI) test or probe test in Chilled mode. 
• Temperature difference between supply and return air is above 1,5C and the system is not capable of pinpointing which probe is failing. 
• Temperature difference between supply and return air and evaporator coil is above 1,5C and the system is not capable of pinpointing which probe is failing. 
• Indicates: 
• Sensor error. 
• Sensor misplacement. 

Corrective Action 

• Using MANUAL FUNCTION TEST, ventilate with evaporator fan high speed and evaluate the readings. 
• Check sensor connections. 
• Replace sensor. 
• Check sensor.