Arrived on site for heating maintenance. Changed all the units filters and checked the belts of all units. Filters were changed for fresh new filters Felts were good and secured. Blew out the burners with CO2 cartridges, clearing gas pathway. Blew out all the p traps of all units. Located one of the units inside the crawl space that is behind the amazing saving sign, noted the filter size. After changing the filters for all units went into the store, was led to the thermostats by the store manager, Dave. Set all thermostats to Heating to see the units operating normally. Went to the roof and units were not operating. One of the units is completely dead, it's the unit for this to the back on the left side if you were standing in the entrance of the store. The unit on the left side from nearest to the entrance of the store does not do heating, gas line is shut off, manager says it stinks the store with the smell of gas.
