If your True refrigerator isn’t holding temperature, the most common culprits are a failed evaporator fan, a worn door gasket, or a frost-blocked coil. Most of these are diagnosable quickly if you know where to look.
Why True Units Drift Off Temperature
True makes some of the most reliable reach-ins in the industry, but they’re not immune to wear. When a unit starts running warm, it’s almost never the compressor right away. What happens more often is something smaller and slower: a gasket that’s been compressing for years, a fan motor cycling on thermal overload, or frost accumulating on the evaporator until airflow chokes off.
The cabinet can look fine from the outside. The compressor runs. The unit just can’t pull down to temp.
Most Likely Cause: Evaporator Fan Motor
The evaporator is the coil inside the cabinet that absorbs heat. A small fan motor circulates air over it continuously. When that motor fails or the blade ices over, air stops moving and cabinet temperature rises even though refrigerant is still flowing.
Signs: the compressor is running and you can hear it, but the inside doesn’t feel cold near the vents. On True reach-ins, the evaporator compartment is typically behind a panel inside the cabinet, often at the top, depending on the model.
A tech will pull that panel, check whether the fan is spinning, test the motor windings, and look for ice buildup on the coil. If the coil is blocked with frost, the real cause is a defrost issue (see below). Accessing the motor and replacing it correctly involves disassembly and electrical work. It’s not something to wing.
Second Most Likely: Door Gasket
A leaking door gasket is the most common cause of temperature drift that operators miss because it’s gradual. The cabinet loses its seal, warm kitchen air gets in, and the unit runs constantly without ever getting cold enough.
One check you can do yourself: close the door on a piece of paper. If it pulls out without resistance, the gasket isn’t sealing. Test around the full perimeter, including the corners. True uses a magnetic gasket that fits into a channel on the door, and they do wear out on high-traffic units.
If the gasket is failing, a tech will remove the old one, seat the new gasket so every corner closes cleanly, and confirm the seal holds. If the door is also sagging, the hinges need adjustment first. A misfit gasket is just as bad as the old worn one.
Frost Buildup and Defrost Issues
True reach-in coolers (not freezers) typically use off-cycle defrost: the compressor shuts off on a thermostat, the fan keeps running, and frost melts naturally before the compressor restarts. There’s no heater element or defrost timer on most True cooler models.
That means frost buildup usually traces back to something letting extra humidity into the cabinet (a bad door gasket, a door left ajar, a damaged sweep) rather than a failed defrost component. When the coil frosts over enough to block airflow, cabinet temperature climbs even with the compressor running.
You may see ice around the fan housing or hear the fan straining. Diagnosis means pulling the evaporator panel and inspecting the coil directly.
True freezer models do use timed defrost with a heater element. If you have a freezer rather than a reach-in cooler, the diagnostic approach is different and requires a tech familiar with that control system.
Other Things a Tech Will Check
Condenser coils get dirty. On most True T-series reach-ins, the condenser is at the bottom front and designed for front-access cleaning. A clogged condenser means the refrigerant can’t reject heat efficiently and the whole system runs hot. Cleaning it every three months is standard preventive maintenance in a commercial kitchen. If it’s been neglected, a tech can clean it as part of a service visit and assess whether the system has been stressed by running hot.
Refrigerant leaks are less common but worth noting. If the unit has been slowly warming over months and nothing else explains it, low refrigerant is possible. That requires a licensed technician with recovery equipment.
Door heater strips (anti-sweat heaters) prevent condensation on door frames and mullions. If they fail, you’ll usually see excessive sweating on the door exterior before it becomes a temperature problem.
Call Us
If you’ve done the paper-pull test and the unit is still drifting, it’s time to have someone look at it in person. Evaporator fans, coil inspections, gasket replacement, and anything involving refrigerant all need hands-on diagnosis you can’t get from the outside.
Don’t wait. A unit that’s struggling is running its compressor harder than normal, and a small fan or seal problem left alone long enough can turn into a compressor job.
We cover True reach-in service across Alameda, Contra Costa, and Santa Clara counties. If your unit is drifting temp, contact us at bayarearefrigerationservice.com and we’ll get you on the schedule fast, often same or next day when we can.