Sub Zero Repair

Sub Zero Refrigerator Repair

Top quality repairs and service for all Sub Zero appliances

Here our technicians understand how to eliminate electrical component failures before assuming and sealed system failure.


In a refrigerator our technicians understand the following circuits

  • Refrigerator system circuits
  • Defrost system circuits
  • Mullion/Stile anti-sweat circuits
  • Ice maker circuits

We test the various loads that provide heat, lights or motion. We test switches that control flow & current on and off status.


Common loads
  • PTC relay
  • Compressor
  • Condenser fan motor
  • Evaporator fan moto
  • Defrost time motor
  • Defrost heater
  • Defrost control board
  • Main control board


Common Switches
  • Defrost timer
  • Thermostats
  • Overloads
  • PTC relays

In order to accomplish the above our technicians fully understand how a sub-zero refrigerator system works. Both parallel circuits and series circuits in each refrigerator system in various models.

In sub-zero refrigerators and many other common refrigeration systems we have found the following sealed system failure types.


Common points of refrigerator failure
  • Evaporator inlet temperature
  • Refrigerator storage temp
  • Condenser inlet temp
  • Condenser outlet temp
  • Suction line temp
  • Unusual refrigerator noises
  • Wattage variations
  • Amperage variations
  • Frost pattern
  • Low side pressures
  • High side pressures


  1. No failure at all
  2. Leak or low charge
  3. Partial Restrictions
  4. Complete restrictions
  5. Over charge

Maintenance tips:

  • Ensure adequate air flow to the system
  • Clean ststem regularly to ensure proper heat extraction
  • Ensure door closes all the way at all times
  • Check for leaks through door gaskets


yellow pages YP btn

Top Rated Local Appliance Repair in Ellicott City

We Service And Repair All Brands
Call Today (443) 295-4865Book A Repair