TM 5-4220-227-14Table 4-2. Unit Troubleshooting Procedures (Cont).MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION8.HEATER/CHILLER OR SCRUBBER FAIL TO OPERATE.Step 1. Check fuse on panel.Replace blown fuse.Step 2. Place scrubber switch on panel to ON. Scrubber fan should rotate. Place heater/chillerswitch on panel to ON. Heater/chiller fan should rotate.If either scrubber or heater/chiller fails to operate, notify Direct SupportMaintenance.Step 3. Both scrubber and heater/chiller fail to operate.DC power is faulty. Notify Direct Support Maintenance.9.HEATER/CHILLER FAILS TO OPERATE.Step 1. Inspect fluid output, check valve. It may be stuck in the closed position causing low outputpressure.Refer to General Support Maintenance.NOTEFor additional information, see figure 6-16 Heater/Chiller Module Flow Diagram.Step 2. Inspect valves at the chamber penetrator. They may be closed or partly closed causing lowoutput pressureOpen valves.Step 3. Inspect fluid level in reservoir. It may be low and causing low output pressure.Add fluid.Step 4. Inspect pump fuse. It may be blown, interrupting electrical power to the pump.Replace fuse.4-19
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