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[EnergyPlus_Support] Maximum iterations exceeded for all HVAC loops

Dear All,
       Could anybody please explain or offer possibe reasons to why my
simple model consisting of a fan a heating coil and a cooling coil would
produce the following warnings?


************* Testing Individual Branch Integrity
   ************* All Branches passed integrity testing
   ************* No node connection errors were found.
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 00:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 00:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 00:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 00:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 00:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 00:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 01:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 01:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 01:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 01:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 01:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 01:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 02:10
   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SUMMER DESIGN DAY, 07/21 02:10
   ** Warning ** SimHVAC: Exceeding max iterations continues...   50
   ** Warning ** SimHVAC: Exceeding max iterations continues...  100
   ** Warning ** SimHVAC: Exceeding max iterations continues...  150
   ** Warning ** SimHVAC: Exceeding max iterations continues...  200
   ** Warning ** SimHVAC: Exceeding max iterations continues...  250
   ** Warning ** SimHVAC: Exceeding max iterations continues...  300
   ** Warning ** SimHVAC: Exceeding max iterations continues...  350
   ** Warning ** SimHVAC: Exceeding max iterations continues...  400
   ** Warning ** SimHVAC: Exceeding max iterations continues...  450
   ** Warning ** SimHVAC: Exceeding max iterations continues...  500
   ** Warning ** SimHVAC: Exceeding max iterations continues...  550
   ** Warning ** SimHVAC: Exceeding max iterations continues...  600
   ** Warning ** SimHVAC: Exceeding max iterations continues...  650
   ** Warning ** SimHVAC: Exceeding max iterations continues...  700
   ** Warning ** SimHVAC: Exceeding max iterations continues...  750
   ** Warning ** SimHVAC: Exceeding max iterations continues...  800
   ** Warning ** SimHVAC: Exceeding max iterations continues...  850
   ** Warning ** SimHVAC: Exceeding max iterations continues...  900
   ** Warning ** SimHVAC: Exceeding max iterations continues...  950
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1000
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1050
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1100
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1150
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1200
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1250
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1300
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1350
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1400
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1450
   ** Warning ** SimHVAC: Exceeding max iterations continues... 1500
   ************* EnergyPlus Completed Successfully-- 44 Warning; 0 Severe
Errors; Elapsed Time=00hr 00min 29sec


                                                 Yours Thankfully:
                                                                James
O'Donnell


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