Sub-Zero freezer repair

• Freezer is running but not freezing

  Start relay, thermostat, or a defrost system that has iced the evaporator solid.

• Heavy frost build-up on the walls

  A door seal letting humid air in, or the defrost heater no longer clearing the coil.

• Compressor runs constantly

  A seal that no longer closes, a thermostat stuck closed, or a condenser coil packed with dust.

• Clicking every few minutes then silence

  The start relay is trying and failing to start the compressor. Left alone, this can cook the compressor windings.

• Water pooling underneath

  A blocked defrost drain, the same fault refrigerators get, or melt water from a unit that stopped freezing overnight.

• Alarm sounding on a modern freezer

  Temperature alarm, usually triggered by a door left ajar or by an evaporator that has iced up.

• Acton, MA
• Andover, MA
• Arlington, MA
• Bedford, MA
• Belmont, MA
• Beverly, MA
• Billerica, MA
• Boston, MA
• Braintree, MA
• Brockton, MA
• Brookline, MA
• Brookline, NH
• Burlington, MA
• Cambridge, MA
• Chelmsford, MA
• Chelsea, MA
• Clinton, MA
• Concord, MA
• Danvers, MA
• Dedham, MA
• Derry, NH
• Dracut, MA
• Everett, MA
• Framingham, MA
• Gloucester, MA
• Haverhill, MA
• Hingham, MA
• Hudson, MA

• Thank you so much! Great customer service. Came and fixed our washer, looks good as new! Hire him

• Tim was very professional and did his job correctly but was sent a defective part. Ramin came and replaced the defective part and my stove works again. After an initial problem that wasn't their fault, masterfix did an excellent job. I would not hesitate to use them again. Thanks Tim and Ramin!

• My dryer was fixed immediately and the contractor gave me filter change recommendations. However, it was not cheap.

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What goes wrong with Sub-Zero freezers?

Dual compressor and evaporator faults is the fault we attend most on this combination. Sub-Zero built the market for built-in refrigeration, and a well-maintained unit lasts twenty years or more. They are worth repairing at ages where a mass-market fridge would be replaced.

How long will food stay frozen while I wait for a technician?

A full chest freezer that stays shut holds safely for about 48 hours, an upright for around 24. Keep the door closed and do not check on it.

There is ice on the back wall. Should I defrost it manually?

You can, and it will run again for a while, but the ice will return within weeks. The defrost system is the actual fault and it is worth fixing properly.

Do you service garage and basement freezers?

Yes. Note that many freezers are not rated for unheated spaces below about 40°F, and a garage freezer in a Massachusetts winter can stop cycling for that reason alone.

Do you carry Sub-Zero parts for this?

We stock the common failures listed on this page. Anything model specific is ordered after the diagnosis, and we tell you the wait before you commit. Every part carries 90 days of warranty.