What causes my SA-2000 Safety Analyzer resistance reads high?

What could cause my SA-2000 Safety Analyzer resistance reads high compared to another Safety Analyzer?

• Check the chassis cable, it could be intermittent or defective.
• Check the receptacle, it could be an indication of worn receptacle.
• Check the Fuse for the proper fuse installation.
• The SA-2000 series takes a 250mA/250V fuse, (P/N UF-0250-01) located on the front panel.