Narrative:

During preflight checks; left 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 left 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 left 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 left 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 flight attendant (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.

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Original NASA ASRS Text

Title: CRJ First Officer reported observing a pneumatic duct overheat warning while in flight.

Narrative: 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.

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.