8-48 
Failure Description  Possible Cause  Recommended Action 
support and the spring is 
damaged or polluted.   
The vaporizer support 
assembly is damaged.   
Replace the vaporizer support 
assembly.  
The general flowmeter is 
leaked. 
Replace the general flowmeter. 
The ORC assembly is leaked.  Replace the ORC assembly. 
The flow regulator is leaked.  Replace the flow regulator. 
The throttling apparatus is 
leaked. 
Replace the restrictor and perform 
calibration again (for details 
about the calibration, refer to the 
FPM-65 Flow and Pressure 
Detection Device Guide.  
The pressure relief valve at the 
breathing connection part is 
leaked. 
Check and replace the damaged 
pressure relief valve. 
The ACGO assembly is 
leaked. 
Replace the ACGO assembly. 
The fresh air connector of the 
circuit transit block assembly 
is leaked. 
Check the seal ring and pipeline 
of the fresh air connector. 
Replace the damaged part. 
After the system is shut 
down, the gas source 
cannot be switched off. 
The internal sealing part of the 
system switch assembly is 
damaged. 
Replace the system switch. 
After the system is started, 
the system cannot be 
supplied with power. 
The contact switch is faulty.  Replace the contact switch of the 
system switch assembly. 
The value indicated by the 
flowmeter floater is 
inaccurate or the floater is 
not floated. 
The floater of the general 
flowmeter is damaged. 
Replace the floater of the general 
flowmeter. 
The knob of the flow 
regulator is loose. 
The flow regulator is 
damaged.. 
Replace the flow regulator. 
The N2O source cannot be 
cut down when the O2 
supply pressure is 
insufficient.  
The ORC assembly is 
damaged. 
Replace the ORC assembly.