8
Mistral Mouthpiece Service Manual
Table 1. Troubleshooting Guide
SYMPTOM
POSSIBLE CAUSE
TREATMENT
1.The connector or valve support O-rings
are extruded, worn or damaged.
1. Replace the O-ring(s)
2. The mouthpiece body is cracked
2. Replace the mouthpiece body
3. The corrugated hoses are worn or
damaged
3. Replace the corrugated hoses
External leak
4. The corrugated hose tightening collars
are damaged or badly tightened
4. Replace the collar(s)
1. The cylinder valve is not completely open
1. Open the valve and check the
cylinder pressure
2. The valve needs servicing
2. Try another cylinder
3. The first stage filter (10) is blocked
3. See the Mistral First Stage Trouble
Shooting Guide
Reduced air flow or a significant
general increase in breathing
resistance in the complete regulator
4. The cylinder is empty
4. Charge the cylinder
1. The valve holders have been fitted the
wrong way round in the mouthpiece
1. Disassemble and refit following the
correct procedure
2. The mouthpiece has been fitted
backwards to the corrugated hoses
2. Disassemble and refit following the
correct procedure
3. The cylinder valve is not open
3. Open the valve
Impossible to inhale or exhale from the
complete regulator
4. The cylinder is empty
4. Charge the cylinder
1. Mouthpiece pierced or broken (1)
1. Replace the mouthpiece
2. Diaphragm damaged
2. See the Mistral Second Stage
Trouble Shooting Guide
3. The connector or valve support O-rings
are extruded, worn or damaged.
3. Replace the O-ring(s)
4. The corrugated hose tightening collars
are damaged or badly tightened
4. Replace the collar(s)
Water enters the mouthpiece during
inhalation
5. The corrugated hoses are worn or
damaged
5. Replace the corrugated hoses
