A330 flight crew reported a fuel issue during cruise that was solved by descending and speeding up.

Attributes
ACN	1701288
Time
Date	201911
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A330
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Fuel System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Fuel Issue

Narrative:

Approximately 39;000 ft.; I was called up to flight deck from my break for a fuel problem. The first officer (first officer) and relief pilot had the ECAM message 'fuel lo temperature'. They ran the checklist and after they turned on the outr tk xfr; the fuel in the left tip trim tank would not transfer and the 'outr to inr fault' message appeared. This is when I was called up; I instructed them to call maintenance and dispatch. When I arrived; maintenance did not have any solutions and dispatch had informed us that another aircraft had the same problem and descended to 34;000 ft. And was suspecting contaminated fuel. We increased speed and descended to 34;000 ft. This allowed us to transfer the fuel to the mains. We climbed back up to 37;000 ft. And continued on to ZZZ with no further issues.

Original NASA ASRS Text

Title: A330 flight crew reported a fuel issue during cruise that was solved by descending and speeding up.

Narrative: Approximately 39;000 ft.; I was called up to flight deck from my break for a fuel problem. The FO (First Officer) and Relief Pilot had the ECAM message 'FUEL LO TEMP'. They ran the checklist and after they turned on the OUTR TK XFR; the fuel in the left tip trim tank would not transfer and the 'OUTR TO INR FAULT' message appeared. This is when I was called up; I instructed them to call maintenance and dispatch. When I arrived; maintenance did not have any solutions and dispatch had informed us that another aircraft had the same problem and descended to 34;000 ft. and was suspecting contaminated fuel. We increased speed and descended to 34;000 ft. This allowed us to transfer the fuel to the mains. We climbed back up to 37;000 ft. and continued on to ZZZ with no further issues.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.