Written by
Clara Bennett Appliance Care EditorPublished September 3, 2026Updated October 20, 2026
Content status:
Verified
Error codeTRIAC BROKEN
ApplianceBlast Chiller
Quick answer
The electronic board of a U-Line blast chiller detected a failure on the PWM output for the variable-speed evaporator fan.
Model compatibility: U-Line reuses codes across series and model years, so TRIAC BROKEN may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
The board detected a failure on the PWM output for the variable-speed evaporator fan; call service.
TRIAC BROKEN is an alarm from the electronic board of a U-Line blast chiller. It reports a failure on the PWM output that drives the variable-speed evaporator fan, and the manual says to call service.
Models
The touch screen controller on the UCBF432, UCBF532, UCBF632, UCBF559 and UCBF659 lists this alarm. It belongs to the current generation.
What to do
View the ALARM tab to confirm the alarm, write it down and call. The fault is on the board, so the work is for a technician.
Related alarms
RELAY 1 BROKEN: another failure detected by the electronic board.
Los Angeles owners can call (310) 879-5776 about a U-Line blast chiller showing TRIAC BROKEN. Have the model number ready and mention whether other alarms appeared. See refrigerator repair.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your U-Line appliance?
Book a specialist visit for a clear estimate and approval before any repair.
U-Line products are compact, built-in, and often visually similar across generations. Effective repair starts with the exact model, the symptom you can…
