Written by
Elena Vasquez Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeRELAY 4 BROKEN
ApplianceBlast Chiller
A blast chiller that displays RELAY 4 BROKEN is reporting a fault the electronic board registered on relay 4. U-Line’s manual gives one instruction: call service.
Before you phone
Leave the control compartment closed.
Open the ALARM tab and read through everything listed there.
Pass every alarm shown on to the person you call.
Chillers that list this alarm
It is part of the touch screen controller alarm list for the UCBF432, UCBF532, UCBF632, UCBF559 and UCBF659. This is the current generation.
Other relay alarms to compare
RELAY 6 BROKEN: same wording, but the fault sits on relay 6
RELAY 2 BROKEN: another numbered relay fault from the same board
Blast chiller service in San Francisco
For a U-Line blast chiller in San Francisco or elsewhere in the Bay Area, (415) 329-7078 is the number to use. Have the alarm name, the model number and a list of anything already tried in front of you. Background on the work is under U-Line freezer repair.
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 control board registered a fault on relay 4, and the manual says to call service.
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.
Frozen food gives you little time. See how U-Line freezers, refrigerator/freezer combinations and commercial blast chillers are diagnosed, and what to do…
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
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