Troubleshooting
FORM
TROUBLESHOOTING GUIDE
PROBLEM |
| POSSIBLE CAUSE | ACTION POSSIBLE CAUSE | ACTION | |
No display on panel - |
| Main supply to control system OFF. | Switch on main supply if safe to do so. |
| |
unit will not start |
|
|
| Check if control panel emergency stop switch | |
|
| Emergency stop device off. | and any remote emergency stop devices are in | ||
|
| the OFF position. Turn to ON position (1) if safe | |||
|
|
|
| ||
|
|
|
| to do so. |
|
|
| CB3 tripped. | Check CB3. |
| |
|
| No supply to - T2. | Check 115VAC to L & 2. |
| |
|
| No 24VAC supply to power board. | Check wiring from - T2 to powerboard and fuse. | ||
|
| No +12V output from powerboard. | Replace powerboard or isolate excessive load on | ||
|
| the board. |
| ||
|
|
|
|
| |
NO RUN PERM displayed |
| No liquid flow through the evaporator. | Ensure that liquid pumps are running. Valves are | ||
(No run permissive) |
| correctly set and flow is established. |
| ||
|
|
|
| ||
|
|
|
| Check that the flow switch is functional and is | |
|
| Flow switch or cycling contacts are |
| ||
|
|
| installed according to the manufacturer’s instructions. | ||
|
| Flow switch contacts are not made. |
| ||
|
| not made. |
| Check cycling contacts. |
|
|
|
|
|
| |
|
|
|
|
| |
|
|
|
|
|
|
SYS # HIGH OIL TEMP |
| Poor airflow through the condenser | Check for airflow restrictions caused by blockages on | ||
|
| coils. | intake faces of air coils. |
| |
|
| Measured temperature incorrect. | Check oil temp sensor and wiring. |
| |
Chiller FAULT: LOW |
| Ambient air temperature is lower | Use the ‘ambient temp.’ key to display the | ||
AMBIENT TEMP displayed |
| than the programmed operating | temperature and confirm that the displayed value is | ||
|
| limit. | approximately correct. The warning message should | ||
|
|
|
| clear when the ambient air temperature rises above | |
|
|
|
| the programmed operating limit. |
|
|
|
|
| Check the programmed settings are correct for the | |
|
|
|
| options fitted to the unit. |
|
|
| Measured temperature is incorrect. | Check ambient sensor and wiring. |
| |
Chiller FAULT: HIGH |
| Ambient air temperature is higher | Use the ‘ambient temp.’ key to display the | ||
AMBIENT TEMP displayed |
| than the programmed operating limit. | temperature and confirm that the displayed value is | ||
|
|
|
| approximately correct. The warning message should | |
|
|
|
| clear when the ambient air temperature falls below | |
|
|
|
| the programmed operating limit. |
|
|
|
|
| Check that the programmed settings are correct for | |
|
|
|
| the options fitted to the unit. |
|
|
| RecirculatedResid. heat airis notis affectingbeing dissipatedthe sensor. . | Check fans are operating correctly and the rotation is | ||
|
| correct. Check for airflow recirculation. |
| ||
|
|
|
|
| |
|
| Measured temperature is incorrect. | Check ambient sensor and wiring. |
| |
Chiller FAULT: LOW |
| Leaving liquid drops below the | Check for restrictions in the liquid flow line. | ||
WATER TEMP displayed |
| programmed low limit faster than the | Check that the liquid flow is stable. |
| |
|
| unit can unload. |
|
| |
|
| Unit is not unloading. | Check the voltage to the unloader valve solenoid. | ||
|
| Check that the compressor unloads correctly. | |||
|
|
|
| ||
|
| Measured temperature is incorrect. | Check water temp sensor and wiring. |
| |
Chiller FAULT: VAC |
|
|
| Check main supply is stable and within allowable | |
UNDERVOLTAGE |
| Poor main supply voltage. | limits. |
| |
displayed. |
|
|
| Check for voltage dip on compressor start. | |
200 | YORK INTERNATIONAL |
