Common Appliance Failure Patterns Reference
Why this matters
Major appliances fail in predictable patterns. Knowing the most common failure modes per appliance type lets you diagnose quickly + recommend repair vs replacement decisions. This is the field card.
Refrigerator failures
Most common:
Compressor not running:
- Starter relay failed
- Capacitor failed
- Thermostat failed
- Compressor seized
- Try relay / capacitor first (cheap)
Not cooling but compressor runs:
- Refrigerant low (rare in sealed system)
- Defrost system issue
- Fan motor failed (interior)
- Thermistor failed
Defrost system failure:
- Defrost timer failed
- Defrost heater failed
- Defrost thermostat failed
- Ice buildup on coils
Water leak:
- Drain pan cracked
- Drain line clogged (defrost water)
- Water filter housing leak
- Ice maker line
Ice maker failure:
- Water inlet valve
- Module failure
- Sometimes whole assembly
Noisy:
- Fan motor (compartment OR compressor)
- Compressor (bearing failing)
- Defrost cycle (normal vs loud)
Typical refrigerator lifespan
- 10-15 years average
- 17-25 years possible with care
- After 15: repair vs replace decision
- New efficient models often justify
Dishwasher failures
Most common:
Not cleaning well:
- Spray arm clogged
- Inlet screen clogged
- Detergent dispenser failed
- Water temperature too low
- Wash motor failing
Won't drain:
- Drain hose kinked
- Drain pump failed
- Air gap blocked
- Disposal not knocked out
Leaking:
- Door seal worn
- Tub-pump connection
- Inlet valve
- Pump seal
Won't start:
- Door switch
- Control board
- Touchpad
Loud:
- Bearing failure
- Worn pump
- Foreign object
Typical dishwasher lifespan
- 9-12 years average
- Mid-tier models 10 years typical
- Premium: 12-15 years
- Repair vs replace at 8-10 years
Washer failures
Most common:
Won't drain:
- Drain pump
- Drain hose clogged
Won't agitate / spin:
- Belt (top-load)
- Direct drive coupler
- Motor coupling
- Lid switch
Leaking:
- Hoses (most common at home; supply line failure catastrophic)
- Pump seal
- Tub seal
- Door seal (front-load)
Bouncing / walking:
- Out of balance
- Shocks failed (front-load)
- Suspension (top-load)
- Loose mounting
Won't fill:
- Inlet valve
- Water supply
Won't start:
- Lid switch
- Control
- Door lock (front-load)
Typical washer lifespan
- 10-13 years average
- Top-load: more reliable
- Front-load: more issues
- Repair vs replace at 8-12 years
Dryer failures
Most common:
No heat (gas):
- Pilot OR igniter
- Gas valve
- Flame sensor
- Thermal fuse
No heat (electric):
- Heating element
- Thermostat
- Thermal fuse
Won't tumble:
- Belt
- Motor
- Door switch
- Drum bearing
Loud:
- Drum bearing (most common loud noise)
- Idler pulley
- Motor
Takes too long:
- Vent restricted (most common!)
- Lint screen clogged
- Heating element weak
- Thermostat issue
Stops mid-cycle:
- Overheating (vent issue)
- Thermal fuse blew
Typical dryer lifespan
- 10-13 years average
- Cheap with vent maintenance
- Belt + motor common replacements
Range / oven failures
Most common:
Burner won't ignite (gas):
- Igniter
- Gas valve
- Ignition switch
- Sometimes clogged orifice
Burner won't heat (electric):
- Element
- Switch
- Wire connection
Oven won't heat (gas):
- Igniter (most common)
- Gas valve
- Thermostat
Oven won't heat (electric):
- Bake OR broil element
- Thermal fuse
- Control board
Inaccurate temperature:
- Thermostat
- Sensor
- Sometimes calibration
Self-clean broken:
- Door latch
- Thermal fuse
- Control board
Typical range / oven lifespan
- 13-15 years average
- Gas more reliable than electric
- Premium 15-20 years
Microwave failures
Most common:
Won't heat:
- Magnetron (replace cost = new microwave often)
- Capacitor
- Diode
- High-voltage transformer
- Door switch (often!)
Won't start:
- Door switch (most common)
- Control board
Sparks:
- Wave guide cover damaged
- Damaged interior
Loud:
- Magnetron failing
- Fan motor
Microwave lifespan + repair
- 8-10 years average
- Often cheaper to replace than repair
- Magnetron expensive
- Door switch easy
Garbage disposal failures
Most common:
Won't turn on:
- Tripped reset (push red button)
- Switch failed
- Motor failed
Hums but won't turn:
- Jammed (use disposal wrench)
- Motor seized
Leaking:
- Sink flange (top)
- Discharge pipe (bottom)
- Body crack (rare; replace)
Loud / grinding:
- Foreign object
- Worn impellers
Garbage disposal lifespan
- 10-15 years
- Light-use longer
- Heavy-use shorter
- Replace cost reasonable
Water heater failures
Tank type, common:
No hot water (gas):
- Pilot out / thermocouple
- Gas valve
- Burner failure
No hot water (electric):
- Element (often)
- Thermostat
- Reset tripped
Not enough hot water:
- Tank too small
- Sediment buildup
- Element failure (electric; lower element common)
Leaking:
- Tank failure (often replace)
- T+P relief
- Drain valve
Rust / discoloration:
- Anode rod consumed
- Tank corroding
Water heater lifespan
- 10-15 years average
- 8-12 with hard water
- Annual flushing extends
- Plan replacement at 12+ years
Replace vs repair decision
Repair when:
- Less than half of new equipment cost
- Equipment under 50% of expected lifespan
- Single component failure
- Customer's preference
Replace when:
- Multiple major failures
- Past expected lifespan
- Major component failure (compressor, magnetron, motor)
- Repair cost > 50% of replacement
- Old + inefficient
Common diagnostic approach
For any appliance:
- Customer's specific complaint
- Reproduce the problem
- Check power + connections
- Verify safety devices (overload, fuse, switch)
- Check most-common failure for that complaint
- Test components
- Identify failed part
- Repair OR recommend replacement
Customer education
Maintenance prevents failures:
- Dryer vent cleaning (fire prevention)
- Refrigerator coils cleaning
- Garbage disposal use (don't put hard items)
- Washer hose replacement (every 5-7 years)
- Water heater flushing (annual)
Use right detergent / product:
- Wrong detergent damages dishwasher / washer
- Hard water reduces equipment life
Don't ignore symptoms:
- Weird sounds
- Different operation
- Catch early; cheaper repair
Parts inventory
Common parts to stock:
Refrigerator: relay, capacitor, water inlet valve, defrost timer
Dishwasher: door switch, drain pump, inlet valve, gasket
Washer: lid switch, drain pump, belt (top-load), pump seal
Dryer: belt, idler pulley, thermal fuse, heating element
Range / oven: igniter (most common), bake element
Water heater: thermocouple, element, T+P valve, drain valve
Pricing service
References
- Manufacturer service manuals
- Manufacturer technical training
- Major appliance industry data
- Manuall internal: Refrigerator Service Reference, Dryer Service Reference, Dishwasher Service Reference