Hach SIGMA 900 - Appendix A Troubleshooting - Sampler Flow Chart (Part 2); Troubleshooting Flow Chart, continued

Appendix A
Page 63
8837apdx_trouble.fm Troubleshooting
Troubleshooting Flow Chart, continued
Is the compressor
physically running?
NO
Is the 'comp on' LED
lit in the PS / TC box?
YES NO
Is nominal 5 VDC present
at TP2 in the PS/TC box?
Is AC line voltage present
at TB5 in the PS/TC box?
Compressor
Assembly
YES
Check terminal block
connections on PS/TC
assy.
NO
Power Supply / Thermal
Control Assy.
Sampler
Controller
Check terminal block
connections on PS / TC
assy.
NO
YES
YES
Power Supply / Thermal
Control Assy.
Is door ajar?
Is door gasket ok?
Is fan running?
Is condensor dirty?
Are louvers/screens
clean and free
of debris?
YES
Check compressor
assy. current draw
Compressor
Assembly
Check refrigerant
charge