Here is a compleet list according to my Slide 7 manual. Translated from dutch.
# TODO : find other alarm codes
ALARMSTATE = {
0: "None",
1: "Low incomming air",
2: "Wrong RPM exhaust fan",
3: "No flame",
4: "Failed Ignition",
5: "Failed airflow sensor",
6: "Failed thermocouple",
7: "Exhaust to hot",
8: "To hot stove",
9: "Failed gear motor",
10: "Circuit board to hot",
11: "Chimney pressure",
12: "Environment temperature sensor failed",
13: "Environment temperature sensor failed",
14: "Environment temperature sensor failed",
20: "Failed triac gear motor",
21: "Power Outage"
}