Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Troubleshooting
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution
Aircraft
During preflight checks; L AOA heat amber msg; CA (Captain) ran the system reset procedure; which cleared the msg. We boarded late; everything was done and we pushed back. After we started Eng 2 and the push; we ran our after start checklist and L Static heat msg displayed. We ran appropriate system reset off-gate procedure but message did not clear. We called Maintenance ran the reset procedure one more time; but the message did not clear. We returned to gate; kept passengers on board until we got information from Maintenance that this was going to take a while to fix; so in coordination with Dispatch and Ops; we deplaned. The aircraft was eventually fixed; pushed off of the gate again; late. We then took off without any issues.As we were on cruise at FL220 and getting ready to start our briefing for the approach into ZZZ; we got L 10th Duct red warning and aural warning. I maintained PF (pilot flying) duties and took over the radios; and CA ran the appropriate QRH checklist. The message did not clear after running the QRH procedure; and it required us to land at nearest suitable airport; to bring the L thrust lever to idle; and land at flaps 20. We decided the nearest suitable airport was ZZZ; weather was good and runway was a suitable length for safe landing. CA then [advised] ATC; and told them we did [not] need any special assistance. CA then started communicating with the FA (Flight Attendant); Dispatch/Ops; and prepared for the approach. He then made an announcement to the passengers notifying them it should be a normal landing.Once the approach was fully setup; CA took over the PF duties and conducted the approach and landing. We landed at flaps 20 without any issues.
CRJ First Officer reported observing a pneumatic duct overheat warning while in flight.