Written by
Clara Bennett Appliance Care EditorPublished September 3, 2026Updated October 20, 2026
Content status:
Verified
Error codeRELAY 4 BROKEN
ApplianceBlast Chiller
Quick answer
The electronic board of a U-Line blast chiller detected a failure on relay 4. The manual says to call service.
Model compatibility: U-Line reuses codes across series and model years, so RELAY 4 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 electronic board detected a failure on relay 4; call service.
What the alarm says
RELAY 4 BROKEN means the electronic board has detected a failure on relay 4. The manual says to call service.
Where it applies
Touch screen controller on the UCBF559 and UCBF659 as well as the UCBF432, UCBF532 and UCBF632. Current generation.
Next steps for the owner
Do not try to open the control compartment.
Check the ALARM tab so you can report every alarm shown.
Call service.
Compare with
RELAY 6 BROKEN: a neighbouring relay alarm with the same meaning for another relay
RELAY 2 BROKEN: same alarm family, different relay number
Los Angeles blast chiller repair
Call (310) 879-5776 for U-Line blast chiller help in Los Angeles. A short description helps: RELAY 4 BROKEN, the model, and any steps already taken. See also 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…
