Daikin has released Technical Service Bulletin TSB-D-GN-LC-0030 related to primary limit switched in Daikin light commercial rooftops.

From Daikin:

It has come to our attention that certain commercial package rooftop models were produced with incorrect primary limit switches. A list of the affected gas/electric (DFG) models is shown below. This affects all equipment prior to serial number 2305143205.

DFG0481D100001F
DFG1803DM00001S
DFG0483D100001F
DFG1804DM00001S
DFG0603WH90001C
DFG2403DH00001S
DFG1204WH00001C
DFG2404DH00001S
DFG1204WH00001F
DFG2404DL00001S
DFG1503DH00001S
DFG2407DH00001S
DFG1503DL00001S
DFG3003DH00001S
DFG1504DH00001S
DFG3004DH00001S
DFG1504DL00001S
DFG3004WH90005C
DFG1507DH00001S

Rework Required

For proper operation, the existing limit switch must be replaced with the new limit switch as identified in the table below for each model.