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This type of warning, where tdb=-914.65 C, typically means the zone is not getting heated. You might add reporting during warmup and reports (output:variable) for the zone temp and furnace performance to see why the zone does not get heated.

Output:Diagnostics, ReportDuringWarmup;

Output:Variable,*,Zone Mean Air Temperature,hourly;

Output:Variable,*, something showing how your equipment is operating , hourly;

See the rdd file for available output report variables.