Chiller/Heater Troubleshooting
66 ARTC-SVX005A-EN
Load higher than capacity of chiller/heater Refer to chiller/heater design specifications
Low refrigeration charge Conduct leak check on refrigeration system
Temperature sensor not properly installed Check that sensor is properly installed in well
Fouled evaporator Reverse flush evaporator; check strainer for debris
Excessive flow through evaporator Reverse flush evaporator; check strainer for debris; check pump, valves
12. Compressor thermal protector switch open (overloading)
Possible Causes Potential Solutions
Electrical malfunction
Check contactors for damage; check wiring for loose connections;
replace compressors
Operating beyond design conditions Allocate chiller/heater for use within operating capacity. Add equipment
Discharge valve partially shut Open valve
Liquid floodback Adjust electronic expansion valve, increase flow, or raise set point
Compressors overamping Correct refrigerant charge; check electrical connections
13. Symptom: No low voltage (24 Vac)
Possible Causes Potential Solutions
Control circuit fuse open Check fuse prong contact points; replace fuse
Phase monitor opened or tripped Replace transformer, T1 or T2
primary or secondary fuse blown
No primary voltage on T1 or T2 Check breakers, fuses; check power supply specifications
14. Symptom: Flow switch open
Possible Causes Potential Solutions
Insufficient water flow Check strainer for debris; clean strainer
Switch defective Replace flow switch
15. Symptom: Electronic expansion valve superheat too high
Possible Causes Potential Solutions
Water/glycol temperature too warm Low refrigerant level; adjust chiller/heater refrigerant charge as required
Obstructed filter dryer Replace filter dryer
Low refrigerant charge Adjust refrigerant as per data plate
Improperly set superheat valve setting Reset valve settings to factory specifications
16. Electronic expansion valve superheat too low
Possible Causes Potential Solutions
Suction temperature sensor not properly located
Check if secured to pipe or insulated; check sensor position on pipe at 4-
8-10-2 o’clock positions
Improperly set superheat valve setting Reset valve settings to factory specifications
Low flow Increase flow or clean strainer
17. Symptom: Contactor/relay inoperative
Possible Causes Potential Solutions
Coil shorted or open Replace contactor
Mechanical parts broken or jammed Replace assembly
Coil shorted or open Replace contactor
Contacts broken or jammed Replace contactor
Contacts pitted or burned Replace contactor
No 24 Vac to coil Check for loose wiring. Replace secondary fuse to T2 transformer
Bad relay on microprocessor controller Replace microprocessor controller
11. Symptom: High chilled water temperature (continued)
Possible Causes Potential Solutions
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