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6. Condensing unit operates for prolonged 1. Shortage Of Refrigerant - Fix Leak, Add Charge
periods or continuously. 2. Control Contacts Stock or Frozen Closed - Clean Contacts or
Replace Control
3. Excessive Heat Load Placed Into Cabinet - Allow Unit
Sufficient Time For Removal Of Latent Heat
4. Prolonged or Too Frequent Door Openings - Plan or
Organize Schedule To Correct Condition
5. Evaporator Coil Iced - Defrost
6. Restriction In Refrigeration System - Determine Locations &
Remove
7. Dirty Condenser - Clean Condenser
8. Filter Dirty - Clean or Replace
7. Start capacitor open or shorted or blown. 1. Relay Contacts Not Opening Properly - Clean Contacts or
Replace Relay If Necessary
2. Prolonged Operation On Start Cycle Due To:
a) Low Voltage To Unit - Determine Reason & Correct
b) Improper Relay - Replace
c) Starting Load Too High - Correct By Using Pump Down
Arrangement If Necessary
3. Excessive Short Cycling - Determine Reason For Short
Cycling (see #5 above) And Correct
4. Improper Capacitor - Determine Correct Size
8. Run capacitor open, shorted or blown. 1. Improper Capacitor - Determine Correct Size & Replace
2. Excessively High Line Voltage (110% of rated max) -
Determine Reason & Correct
9. Relay defective or burned out. 1. Incorrect Relay - Check & Replace
2. Incorrect Mounting Angle - Remount Relay In Correct
Position
3. Line Voltage Too High or Too Low - Determine Reason &
Correct
4. Excessive Short Cycling - Determine Reason (see #5 above)
& Correct
5. Relay Being Influenced By Loose Vibrating Mounting -
Remount Rigidly
6. Incorrect Run Capacitor - Replace With Proper Capacitor
10. Product zone temperature too high. 1. Control Setting Too High - Reset Control
2. Inadequate Air Circulation - Rearrange Product Load To
Improve Air Circulation
11. Suction line frosted or sweating. 1. Overcharge of refrigerant - Correct Charge
2. Evaporator Fan Not Running - Determine Reason & Correct
12. Liquid line frosted or sweating. 1. Restriction In Dehydrator or Strainer - Replace Part
2. Liquid Shut-Off (king valve) Partially Closed - Open Valve
Fully
13. Noisy condensing unit. 1. Loose Parts or Mounting - Find & Tighten
2. Tubing Rattle - Reform To Free Of Contact
3. Bent Fan Blade Causing Vibration - Replace Blade
4. Fan Motor Bearing Worn - Replace Motor
IX. TROUBLESHOOTING GUIDE (cont’d)
PROBLEM POSSIBLE CAUSE/REMEDY