York Chiller Troubleshooting & Fault Codes
When it comes to HVAC, York is one of the top manufacturers in the industry, making a wide variety of chillers to cool down any large building with ease. If your unit is experiencing issues or displaying fault codes, knowing what is causing it can be tricky. Our guide below provides York chiller troubleshooting tips and breakdowns of fault codes for popular air-cooled screw liquid models.
Unit Won’t Start or Run
If there is no display on the control panel and the chiller isn’t starting or running, look for the following causes:
- No power supply to the panel – Switch on the main power supply.
- Wiring and electrical issues – Contact and authorized technician to repair and replace necessary wiring or electrical components.
- Defective control or display board – The control or display boards could be broken. Either component will need to be repaired or replaced by an authorized technician.
- Blow line fuse – The fuse will need to be repaired or replaced.
Chiller Fault: Low Ambient Temperature
- Ambient temperature too low – The ambient temperature could be below the programmed operating temperature.
- Broken ambient sensor – Have an authorized technician check if the ambient sensor is broken. A tech will compare the temperature reading on the display to a thermometer reading at the sensor. If the reading isn’t comparable, the sensor will need to be replaced.
Chiller Fault: High Ambient Temperature
- Ambient temperature too high – The ambient temperature could be above the maximum operating temperature.
- Broken ambient sensor – Have an authorized technician check if the ambient sensor is broken. A tech will compare the temperature reading on the display to a thermometer reading at the sensor. If the reading isn’t comparable, the sensor will need to be replaced.
Chiller Fault: Low Leaving Chilled Liquid
- Leaving chilled liquid temperature drops faster than unit can unload – There could be restricted flow or rapid flow changes, or the flow is below minimum for the unit. The water loop also might be too small.
- Broken chilled water sensor – There could intermittent operation with the sensor or shorts in the wiring. Contact an authorized technician to check and repair any issues.
System Fault: Control Voltage
If this fault appears, this means the system fuse has blown. Have an authorized technician check and repair the problem.
System Fault: High Oil Temperature
- Broken oil temperature sensor – An authorize technician will need to verify if the reading is reasonable.
- Condenser fans broken or running backwards – Have the fans checked, cleaned and repaired by an authorized technician.
- Dirty coils – Have the coils cleaned by an authorized technician.
System Fault: High Discharge Pressure
- Damaged or dirty coils – Contact an authorized technician to clean coils, comb fins and make any necessary repairs.
- Fans aren’t operating – If the unit’s fans aren’t operating, have the fan’s rotation, fuses and motor blades checked and remedied by an authorized technician.
- Overcharged system – An authorized technician will need to remove charge and check the subcooling.
System Fault: High Motor Temperature
This system fault occurs when there is high temperature input from one of the sensors. Look for the following causes:
- Broken discharge temperature sensor – Contact an authorized technician to check and repair the sensor.
- Condenser fans broken or running backwards – Have the fans checked, cleaned and repaired by an authorized technician.
- Dirty coils – An authorized technician will need to clean the coils.
- High superheat – An authorized technician will have to measure superheat to determine the cause.
System Fault: Low Suction Pressure
- Low flow or charge – There could be low flow or charge in the unit. For low charge, an authorized technician check and remedy the subcooling.
- Incorrect reading on transducer – The transducer could be broken.
- Inoperable/broken feed or drain valve – Have the feed and drain valve checked for an authorized technician.
System Fault: Discharge Pressure Limiting
- Broken discharge transducer – An authorized technician will need to check and repair.
- High ambient temperature – This can occur occasionally during normal operation.
- Inoperable fans – Check for an obstruction or damage.
System Fault: Motor Current Limiting
This is usually caused by different factors when the high-motor current anticipatory control activates current limiting. These factors include:
- High ambient temperature – This is a normal response from the controller when the ambient temperature is high.
- Remote or panel limiting in effect – This is a normal response when either the remote or panel limiting is in effect.
- Dirty condenser coils – The condenser will need to be cleaned.
- Inoperable fans – The fans are not operating properly and will need to be repaired by an authorized technician.
VSD Fault: High Baseplate Temperature
- Low level coolant – Coolant will need to be added to the unit by an authorized technician.
- Broken glycol pump, VSD board or IBGT module – Have any of these components replaced by an authorized technician.
VSD Fault: Low DC Bus Voltage
When there is Low DC bus voltage, either the SCR/diode module or SCR trigger board is broken. Both components would need to be repaired or replaced by an authorized service technician.