PREVOST H3-41 Maintenance Manual page 720

SECTION 18b: X3 SERIES BODY
Troubleshooting
•
SYMPTOMS
DOOR WILL NOT OPEN FROM
EXTERIOR SWITCH.
DOOR WILL NOT
FROM EXTERIOR SWITCH.
DOOR WILL NOT OPEN FROM
INTERIOR SWITCH.
DOOR WILL NOT
FROM INTERIOR SWITCH.
DOOR WILL NOT
AFTER DRAINING AIR FROM
SYSTEM BY EMERGENCY
VALVE(S).
DOOR LOCKS
ENGAGED WHEN DOOR IS
OPEN.
36
PA1621 Maintenance Manual All Series | Revised Sept 2019
PROBABLE CAUSES
Manual door locks engaged.
Upper and lower solenoid locks
do not disengage.
Relay module do not receive
current.
Opening solenoid door does not
receive current.
Switch malfunction.
Switch malfunction.
CLOSE
Solenoid failure.
Manual door locks engaged.
Upper and lower solenoid locks
do not disengage.
Module relay does not receive
electric current.
Door opening solenoid does not
receive current.
Switch malfunction.
Upper lock stays engaged
Switch malfunction.
CLOSE
Door closing solenoid does not
receive electric current.
Manual door locks engaged.
OPEN
Damper cylinder blocks the door.
The upper lock blocks the door.
Power supply is cut at solenoid.
STAY
Lock solenoid
disengage.
Release manual door locks.
Check voltage at solenoid locks when door is
open. If the voltage is 24 volts then replace
solenoid #641217. Else, check circuit power.
Reset breaker "ON" or check batteries power
supply.
Check voltage at opening solenoid door. If the
voltage is 24 volts then replace it. Else replace
control relay.
Replace switch.
Replace switch.
Check voltage at solenoid. If the voltage is 24
volts then replace solenoid. Else replace
control relay.
Release manual door locks (open position)
from vehicle exterior.
Check voltage at solenoid locks when door is
open. If the voltage is 24 volts then replace
solenoid #641217. Else, check circuit power
and replace control relay.
Reset breaker "ON" or check batteries power
supply.
Check voltage at door opening solenoid. If the
voltage is 24 volts then replace it. Else replace
control relay.
Replace switch.
Lubricate upper lock assembly. Check wear
and replace parts if necessary.
Replace switch.
Check voltage at door closing solenoid. If the
voltage is 24 volts then replace it. Else replace
control relay.
Release manual door locks (open position)
from vehicle exterior.
Adjust or replace damper cylinder.
Adjust upper lock. Lubricate upper latch bolt.
Adjust upper latch height.
Place switch in open position.
Check voltage at solenoid lock when door is
does not OPEN. If the voltage is 24 volts then replace
solenoid #641217. Else, check circuit power
and replace control relay.
REMEDY