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I have the following error messages, but I am not sure why one is a warning and the other a severe warning/error. How can I fix it?

* Warning * UpdateZoneSizing: Heating supply air temperature (calculated) within 5C of zone temperature * ~~~ * ...check zone thermostat set point and design supply air temperatures * ~~~ * ...zone name = TZ - S6 - AHU 4 VAV * ~~~ * ...design heating load = 5957.52 W * ~~~ * ...thermostat set point temp = 25.000 C * ~~~ * ...zone temperature = 24.993 C * ~~~ * ...supply air temperature = 27.000 C * ~~~ * ...temperature difference = 2.00704 C * ~~~ * ...calculated volume flow rate = 2.41854 m3/s * ~~~ * ...calculated mass flow rate = 2.91094 kg/s * Severe * UpdateZoneSizing: Heating supply air temperature (calculated) within 2C of zone temperature * ~~~ * ...check zone thermostat set point and design supply air temperatures * ~~~ * ...zone name = TZ - S6 - FCU 1 * ~~~ * ...design heating load = 175.39 W * ~~~ * ...thermostat set point temp = 25.000 C * ~~~ * ...zone temperature = 25.001 C * ~~~ * ...supply air temperature = 27.000 C * ~~~ * ...temperature difference = 1.99877 C * ~~~ * ...calculated volume flow rate = 7.14982E-002 m3/s * ~~~ * ...calculated mass flow rate = 8.60548E-002 kg/s * Warning * Calculated design heating load for zone=TZ - S7 - LIFTS is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.

I have since changed some of the values, but I am asking for knowledge and documentation sake. Thank you!

I have the following error messages, but I am not sure why one is a warning and the other a severe warning/error. How can I fix it?

** Warning * ** UpdateZoneSizing: Heating supply air temperature (calculated) within 5C of zone temperature
 *   ~~~   * **   ~~~   ** ...check zone thermostat set point and design supply air temperatures
 *   ~~~   * **   ~~~   ** ...zone name = TZ - S6 - AHU 4 VAV
 *   ~~~   * **   ~~~   ** ...design heating load         = 5957.52 W
 *   ~~~   * **   ~~~   ** ...thermostat set point temp   = 25.000 C
 *   ~~~   * **   ~~~   ** ...zone temperature            = 24.993 C
 *   ~~~   * **   ~~~   ** ...supply air temperature      = 27.000 C
 *   ~~~   * **   ~~~   ** ...temperature difference      = 2.00704 C
 *   ~~~   * **   ~~~   ** ...calculated volume flow rate = 2.41854 m3/s
 *   ~~~   * **   ~~~   ** ...calculated mass flow rate   = 2.91094 kg/s
 * ** Severe  * ** UpdateZoneSizing: Heating supply air temperature (calculated) within 2C of zone temperature
 *   ~~~   * **   ~~~   ** ...check zone thermostat set point and design supply air temperatures
 *   ~~~   * **   ~~~   ** ...zone name = TZ - S6 - FCU 1
 *   ~~~   * **   ~~~   ** ...design heating load         = 175.39 W
 *   ~~~   * **   ~~~   ** ...thermostat set point temp   = 25.000 C
 *   ~~~   * **   ~~~   ** ...zone temperature            = 25.001 C
 *   ~~~   * **   ~~~   ** ...supply air temperature      = 27.000 C
 *   ~~~   * **   ~~~   ** ...temperature difference      = 1.99877 C
 *   ~~~   * **   ~~~   ** ...calculated volume flow rate = 7.14982E-002 m3/s
 *   ~~~   * **   ~~~   ** ...calculated mass flow rate   = 8.60548E-002 kg/s
 * ** Warning * ** Calculated design heating load for zone=TZ - S7 - LIFTS is zero.
 *   ~~~   * **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
inputs.