SECTION 7
SERHT50NA A0808 7-5
Ventilator does not
operate on internal battery.
PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION
Battery fully discharged.
Battery fuse defective.
Defective Main PCB.
Connect HT50 to A.C. power, allowing
battery to charge for several hours, then
check charge level. If the battery does not
seem to be charging, disconnect the battery
wiring harness from the charger. Check the
voltage across the battery wiring harness
connector. If voltage is > 0 volts but < 8
volts, replace battery.
Check the voltage across the battery wiring
harness connector. If voltage is 0 volts,
replace fuse.
Replace Main PCB.
ELECTRONIC TROUBLESHOOTING
Ventilator is unable to
switch from DC power
back to AC power.
Defective Power Supply PCB.
Defective Main PCB.
If ventilator functions normally on internal
battery, replace Power Supply PCB.
Replace Main PCB.
10 V SHUTDOWN
Device Alert Alarm
Defective Main PCB. Replace Main PCB.
OCCL. SHUTDOWN
Device Alert Alarm
Prox line kinked or prox filter occluded.
Defective Solenoid.
Defective Main PCB.
Replace prox line filter and check prox line
for obstruction.
Replace Pump Assembly.
Replace Main PCB.
SYSTEM ERROR
Device Alert Alarm
EPROM not seated firmly.
Battery completely empty or
disconnected during ventilation.
Defective Main PCB.
Make certain EPROM is firmly in the
socket.
Check battery connectors and fuse. Charge
battery.
Replace Main PCB.
MOTOR FAULT
Device Alert Alarm
Pump is unable to get sufficient air
intake.
Defective Pump Assembly
Defective Main PCB.
Check air intake filter. Replace as needed. If
using Air/O
2
mixer, verify sufficient tank
supply pressure.
Replace Pump Assembly.
Replace Main PCB.
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