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This indicates the possibility of coil frost/freeze(VRV System),what should I do

* Warning * Coil:Cooling:DX:VariableRefrigerantFlow "LIVINGROOM1 VRF COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -3.32 C. * ~~~ * ...Occurrence info = SHANGHAI ANN HTG 99.6% CONDNS DB, 01/21 09:00 - 09:01 * ~~~ * ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil * ~~~ * 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 5.885 C. * ~~~ * 2) may have a low air flow rate per watt of cooling capacity. Check inputs. * ~~~ * 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs. * Warning * ZoneHVAC:TerminalUnit:VariableRefrigerantFlow "LIVINGROOM1 VRF TERMINAL UNIT" * ~~~ * Terminal unit part-load ratio calculation failed: PLR limits of 0 to 1 exceeded * ~~~ * Please fill out a bug report and forward to the EnergyPlus support group. * ~~~ * Environment=RUNPERIOD1, at Simulation time=02/23 07:08 - 07:09

This indicates the possibility of coil frost/freeze(VRV System),what should I do

*

  ** Warning * ** Coil:Cooling:DX:VariableRefrigerantFlow "LIVINGROOM1 VRF COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -3.32 C.
   *   ~~~   * **   ~~~   **  ...Occurrence info = SHANGHAI ANN HTG 99.6% CONDNS DB, 01/21 09:00 - 09:01
   *   ~~~   * **   ~~~   ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil
   *   ~~~   * **   ~~~   **    1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 5.885 C.
   *   ~~~   * **   ~~~   **    2) may have a low air flow rate per watt of cooling capacity. Check inputs.
   *   ~~~   * **   ~~~   **    3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.
* ** Warning * ** ZoneHVAC:TerminalUnit:VariableRefrigerantFlow "LIVINGROOM1 VRF TERMINAL UNIT"
   *   ~~~   * **   ~~~   ** Terminal unit part-load ratio calculation failed: PLR limits of 0 to 1 exceeded
   *   ~~~   * **   ~~~   ** Please fill out a bug report and forward to the EnergyPlus support group.
   *   ~~~   * **   ~~~   **  Environment=RUNPERIOD1, at Simulation time=02/23 07:08 - 07:09

07:09

This indicates the possibility of coil frost/freeze(VRV System),what should I do

  ** Warning ** Coil:Cooling:DX:VariableRefrigerantFlow "LIVINGROOM1 VRF COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -3.32 C.
   **   ~~~   **  ...Occurrence info = SHANGHAI ANN HTG 99.6% CONDNS DB, 01/21 09:00 - 09:01
   **   ~~~   ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil
   **   ~~~   **    1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 5.885 C.
   **   ~~~   **    2) may have a low air flow rate per watt of cooling capacity. Check inputs.
   **   ~~~   **    3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.
** Warning ** ZoneHVAC:TerminalUnit:VariableRefrigerantFlow "LIVINGROOM1 VRF TERMINAL UNIT"
   **   ~~~   ** Terminal unit part-load ratio calculation failed: PLR limits of 0 to 1 exceeded
   **   ~~~   ** Please fill out a bug report and forward to the EnergyPlus support group.
   **   ~~~   **  Environment=RUNPERIOD1, at Simulation time=02/23 07:08 - 07:09