Christian Horner admits Red Bull has hit "numerous" issues during the first test at Jerez after ending its running for the week.

Red Bull managed just 21 laps in total over the four days of testing, with Sebastian Vettel completing 11 and Daniel Ricciardo 10. With the team having been unable to resolve its problems at the circuit it called an end to its running early on Friday and Horner admits there is not one single problem which needs resolving.

"It's been a very difficult test," Horner said. "We have had numerous Renault issues as well as chassis cooling issues, which have affected our progress.

"However, despite the lack of mileage, what we have managed to learn shows that the problems should be solvable for the next test in Bahrain. Part of the purpose of this early test was to learn about any issues ahead of the start of the season and there will now be a lot of focus on the dyno over the next few weeks."

Race engineering co-ordinator Andy Damerum hinted that Friday's running was curtailed by a new problem to the ones which have restricted mileage on previous days.

"We did seven laps and every time Daniel went out we made improvements to the control of the engine," Damerum said. "We were also making fixes to the issues that have arisen from our side and we have made progress there.

"However, we then discovered a mechanical issue with the car and after investigation it became clear we would not be able to fix this in time to run in the afternoon, so the decision was taken to retire early, take the data we have amassed and work towards the next test in Bahrain. Two weeks is a long time in Formula One and we and I'm sure Renault will work flat out now to solve the problems we've been having."

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