Haas boss Guenther Steiner says the team must get to the bottom of the teething electrical issues that disrupted the US outfit's third day of running in Barcelona.
The team's VF-19 was halted three times over the course of Wednesday's session with Pietro Fittipaldi left stranded out on the track in the morning and Romain Grosjean stopping twice in the afternoon.
"It’s annoying more than frustrating, the car has good potential, the drivers like it, we just need to sort out these little gremlins," said Steiner.
"We just need to find what causes it. We still have time to find it, therefore I am not too desperate.
"I’m not liking it, to be honest, I could do without it, but still it is nothing to be desperate about, we will fix it."
Despite the setbacks, Fittipaldi and Grosjean still managed to achieve a combined 117 laps on Day 3, and the Frenchman offered his positive feedback on the team's VF-19.
"A few electronics issues to work out, but that shouldn't be too complicated," he said. "t's not a bad day to be fair.
"Yes, we came back a couple of times in the 4x4 and had to stop the car on track. But that's part of testing and we're finding our limitations and what we can do better on the car.
"The main thing here is the car is really good, a good step has been made from Monday. I was already happy on Monday, but I'm more happy now.
"I think we're getting better and better, and really improving the car and working in a good direction. So [I’m] very much looking forward to working more tomorrow."
Grosjean will resume his workload on Thursday morning before Kevin Magnussen takes over testing duties in the afternoon.
The Dane's day of work came to a premature end on Tuesday because of a headrest issue. However, Steiner said the specific problem had been solved.
"We just had to modify the headrest and the seat. Nothing big, it’s an adaption," said the Italian.
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