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Air Conditioner

10 Most Common Problems

Diagnosis &
Repair Cost

(U.S. dollars w/o tax)
1. Outdoor unit does not come on 
 a. No AC power to unit  
 
- Defective breaker
 $95 - 144
 
- Wire burned at disconnect
 $68 - 90
 
- Transfer to electrician
 $43 - 58
 b. Defective contactor $114 - 271
 c. Defective thermostat $122 - 162
 d. Defective transformer $99 - 132
 e. Dog chewed through low voltage wires $68 - 90
 f. Wire burned off at contactor $68 - 90

2. Circuit breaker trips when unit turned on
  
 a. Weak breaker $95 - 144
 b. Grounded compressor $700 - 1100
 c. Condenser fan motor shorted to ground $248 - 337
 d. Defective contactor $114 - 271

3. Unit hums but fan does not run
  
 a. Defective fan motor $248 - 337
 b. Burned wire $68 - 90
 c. Defective capacitor $123 - 164

4. Unit fan runs but compressor does not
  
 a. Burned wire at compressor $68 - 90
 b. Compressor out on overload protector  
 
- Adjust refrigerant charge
 $48 + 24 per lb.
 
- Clean condenser coil
 $94 - 125
 
- Defective run capacitor
 $123 - 164
 
- Replace compressor if won't reset
 $700 - 1100
 c. Defective compressor $700 - 1100
 d. Defective start capacitor $132 - 176
 e. Add hard start relay $157 - 209

5. Outdoor unit runs, no fan inside
  
 a. Defective blower motor $275 - 385
 b. Defective capacitor $88 - 118
 c. Evaporator coil dirty $103 - 140
 d. Dirty filter $43 - 58
 e. Wire burned off $68 - 90
 f. Defective fan center $179 - 239

6. AC leaking water inside house
  
 a. Drain stopped up $77 - 102
 b. Evaporator coil pan rusted out $800 - 1200
 c. Unit frozen up  

7. Ice on lines at u/s unit and at condenser
  
 a. Evaporator extremely dirty $103 - 140
 b. Dirty filter $43 - 58
 c. Low on refrigerant $48 + 24 per lb.
 d. Defective blower motor $275 - 385
 e. Defective blower motor capacitor $88 - 118

8. Thermostat not holding temperature that is set for
  
 a. Thermostat not calibrated $43 - 58
 b. Defective thermostat $122 - 162

9. Several rooms in home warmer than others
  
 a. No dampers installed in duct system Time & Materials
 b. Air not balanced in system  
 
- balance system w/dampers
 $90 - 120

10. Unit runs constantly
  
 a. Low on refrigerant $48 + 24 per lb.
 b. Returns pulling attic air Time & Materials
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