First Officer reported a Flashing HYD PRESS with a Master Caution after flap retraction. The flight crew continued to landing at a diversion airport.

Narrative

After positive rate; gear up; a Flashing HYD PRESS with a Master Caution after Flap Retraction came on. We had the following conditions. HYD PRESS; Nose Gear Unlock Light; and a STAB MIS COMP. We ran HYD PRESS QRH. Pulled and reset HYD Control CB as per the QRH. We maintained 200 kts. and FL 310 as per the QRH. HYD PRESS remained illuminated for 30 min just prior to landing. And HYD PRESS light extinguished. The STAB MIS COMP Stayed on and we still had a Nose Gear Unlock Light. prior to commencing our approach we put down gear and flaps. We had normal indications. We had three green for gear and STAB MIS COMP extinguished. In our decision making; after running the QRH with the HYD PRESS on; we decided to divert to an airport with a longer runway Initially we were going from ZZZ to ZZZ1 and decided to use ZZZ2 with its 10;000 ft. runway verses ZZZ1 5;700 ft. runway. Taking into consideration any further HYD complications; loss of flaps and gear. We made the decision to [request priority handling] with TRACON; as we could not comply with speeds on the ZZZZZ arrival as we were restricted at 200 kts. in the descent; also the potential to not have flaps and possible alternate gear extension. We got delaying vectors prior to commencing the approach; to put down gear and flaps to see if there would be any further complications.