Repair guides
Pick a type, an appliance or a brand. Every guide lists the tools, the safety call-outs, the steps and the reading you should expect.
Diagnostic · 374
Symptom → most likely cause, step by step
Component tests · 69
How to test a specific part, with expected readings
Installation · 33
Install, replace and hook up appliances correctly
Fundamentals · 24
Core skills every appliance tech uses
Appliance
Brand-specific guides
8 guides · Refrigerators
Component tests · 8
Component test · RefrigeratorHow to check an ECM / brushless DC fan motor (what you can test safely)
Many modern refrigerator fans are brushless DC motors with their electronics inside the motor. An ohmmeter cannot judge them reliably. The safe test is to confirm the supply voltage and control/feedback signals at the connector, then swap the motor if the signals are right.
Component test · RefrigeratorHow to test a refrigerator air damper (damper motor or damper control)
The damper opens and closes the cold-air path from the freezer to the fresh-food section. Older ones are mechanical (bellows), newer ones use a small motor driven by the board. Ice in the duct is a frequent cause.
Component test · RefrigeratorHow to test a refrigerator bi-metal defrost thermostat
The bi-metal (defrost termination thermostat) is wired in series with the defrost heater. It is closed only when the evaporator is cold and opens once the coil warms during defrost. Testing it at room temperature gives a false "bad" result: it must be cold.
Component test · RefrigeratorHow to test a refrigerator compressor start relay (PTC) and overload (electrical only)
The start device (PTC or current relay) and the overload plug onto the compressor terminals. Test them off the compressor. Electrical tests only: any compressor replacement, refrigerant work or brazing is a sealed-system job for an EPA 608-certified technician.
Component test · RefrigeratorHow to test a refrigerator defrost heater
The defrost heater (glass tube, metal sheath or foil type) melts frost off the evaporator a few times a day. A good heater reads in the low tens of ohms; use the wattage math to check the exact value.
Component test · RefrigeratorHow to test a refrigerator mechanical defrost timer
Older refrigerators use a motor-driven timer that switches between cooling and defrost. Turning the advance screw lets you force defrost and test the contacts; terminal numbering varies, so use the diagram on the timer or tech sheet.
Component test · RefrigeratorHow to test an ice dispenser auger motor
The auger motor turns the auger in the ice bucket to push ice to the chute. A clump of frozen ice is the most common cause; test the motor only after the bucket is clear.
Component test · RefrigeratorRefrigerator inverter compressor board: what is safe to check
Inverter boards make variable-frequency 3-phase power for the compressor. Electrical checks of the board and compressor terminals are allowed; anything that opens the sealed refrigerant system is EPA 608 work and blocked. Boards fail more often than compressors.