Why is my commercial walk-in cooler or reach-in cooler warming up above 41°F?

Common root causes include a fouled condenser coil causing high-head-pressure cutout, an iced evaporator coil from a failed defrost timer or heater, a failed evaporator fan motor, a starved thermostatic expansion valve (TXV), or a refrigerant leak. JW HVACR LLC diagnoses and repairs commercial refrigeration within 60 miles of Knoxville with a 90-Day Repair Warranty.

Why is my walk-in freezer evaporator coil iced up into a solid block?

Solid ice buildup on a walk-in evaporator usually points to an open defrost heater element, a failed defrost termination/fan-delay switch (klixon), a stuck defrost timer, a clogged or unheated condensate drain line, or moisture infiltration through torn door gaskets (10 CFR § 431.306). Never chip coil ice with sharp tools; call (865) 214-7334.

Why is my commercial ice machine running but not dropping or harvesting ice?

When an ice machine freezes a slab on the evaporator plate but fails to harvest, the most likely causes are mineral scale bridging the harvest probe or nickel/stainless grid, a sticking hot-gas harvest valve coil, low water flow across the water curtain, or high condenser head pressure.

Why is my brewery glycol chiller locking out on a freeze or low-pressure alarm?

A glycol chiller freeze alarm is typically caused by diluted USP food-grade propylene glycol concentration below 25%–30% (21 CFR § 184.1666), a plugged hydronic Y-strainer reducing glycol flow across the brazed-plate heat exchanger, an air-locked circulation pump, or a misadjusted TXV/freeze stat.

What areas around Knoxville does JW HVACR LLC serve and what warranty is included?

Based at 823 Reed Dr, Powell, TN 37849, JW HVACR LLC serves commercial and industrial facilities within 60 miles of Knoxville (including Powell, Knoxville, Oak Ridge, Maryville, Alcoa, Farragut, Sevierville, Pigeon Forge, Gatlinburg, Morristown, and Lenoir City). Every repair is backed by our 90-Day Repair Warranty. Office hours are 8:00 AM–5:00 PM Mon–Fri, with 24/7 emergency service available after hours at (865) 214-7334.

JW HVACR LLC 10/20/26 JW HVACR LLC 10/20/26

Walk-in cooler not cooling? What to check before you call, and what to leave to a tech

Walk-in cooler running warm in the Knoxville area? Run these 5 safe 10-minute checks before you call a tech, see our symptom-to-cause diagnostic table, and know which sealed-system repairs to leave to an EPA-certified technician.