Traulsen G-Series Running Warm? The Evaporator-Fan Motor Is a Common Culprit
What I Found On This Traulsen Service Call
I got out to a chef-driven restaurant in Costa Mesa late in the morning. The kitchen manager had a Traulsen G-Series RIH two-door reach-in on the cook line that had drifted up to 44 degrees overnight even though the digital display kept showing 38. The TempAssure alarm hadn’t even triggered. The first they knew about it was when a line cook reached in for proteins during morning prep and found everything noticeably warmer than it should be.
The Traulsen G-Series uses TempAssure logic — a digital control system that monitors compartment temperature and triggers alarms when readings drift out of range. When the display shows 38 but the actual food zone is at 44, there’s a disconnect between the temperature the controller thinks the box is at and the temperature it actually is. That disconnect usually comes down to airflow. On the Traulsen G-Series RIH evaporator-fan motor / TempAssure board pairing, if the evaporator fan is weak or stopped, the cold air pools at the coil and never reaches the sensor mounted in the airflow path. The controller sees correct air-flow temperatures from a small slice near the coil and reports the box as cold, while the rest of the cabinet creeps warm.
I opened the upper section first. Compressor was running fine, condenser was clean, evaporator coil was frost-free. Pulled the back panel inside the cabinet to look at the evap fan.
How I Narrowed It Down
The evap fan was running but spinning visibly slower than its mate in the lower section. I put a clamp meter on its lead and the current draw was lower than it should be — the motor was struggling on its windings. Spun the blade by hand with the power off and felt grit in the bearing. Not seized, but on the way out. The motor was producing maybe 60% of normal airflow, which was just barely enough to keep the cold air near the coil moving but not enough to reach the back corners of the cabinet.
I also checked the TempAssure board diagnostics to make sure the sensor itself was reading correctly. The sensor was honest — it was reporting the air-flow temperature near the coil accurately, around 36-37 degrees. The problem was that nothing else in the cabinet was being reached by that cold air. So replacing the sensor wouldn’t have done a thing. The fan motor was the actual fault.
I should also mention — on these G-Series RIH units, the TempAssure board itself is a known potential failure point on older units. I always run the diagnostics menu to check board health before condemning any other component. The board on this one was healthy and current — no need to touch it.
The Fix and What It Took
The evaporator fan motor on the Traulsen G-Series is a brand-specific part. I had a compatible motor on the truck for this generation. Swap took about thirty minutes — pull the back panel, disconnect the old motor, mount the new one, reconnect, button up the panel. Powered the unit back up and watched the new motor spin up to proper RPM immediately. Current draw was right where it should be on the meter.
Box started recovering within twenty minutes. By the time I left, the cabinet temperature was 39 and dropping toward 38. The kitchen manager moved his product around as a precaution and lost nothing.
Total time on site was a little over an hour. The restaurant paid the flat parts-and-labor price. Diagnostic fee was waived because they moved forward with the repair. Parts and labor are backed by our 3-month warranty.
A note for restaurant operators. If your Traulsen G-Series display reads correctly but the box feels warm, that’s almost always an airflow problem from a weak or stopped evaporator fan. If the display itself is showing wildly wrong numbers or going dark, that’s a TempAssure board issue and a different repair entirely.
If you’re running a restaurant, hotel, or catering kitchen in Costa Mesa, Newport Beach, or anywhere in Orange County and your Traulsen reach-in is running warm, give us a call. We’re an independent commercial-refrigeration shop with experienced technicians on Traulsen G-Series equipment, and we can usually get out the same or next day during business hours. $65 diagnostic, waived with repair.