Troubleshooting - PREVOST H3-41 Maintenance Manual

SECTION 18a: H3 SERIES BODY

10.8 TROUBLESHOOTING

SYMPTOM
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.
DOOR DO NOT LOCK WHEN
DOOR IS CLOSED.
28
PA1621 Maintenance Manual All Series
PROBABLE CAUSE
Manual door locks engaged.
Upper and lower solenoid locks do not
disengage.
Relay module do not receive current.
Opening solenoid door
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
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
Solenoid lock does not disengage.
Emergency valve is open.
Lock solenoid stays electrified.
Lock solenoid works in reverse.
Relay does not function.
|
Revised Sept 2019
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.
does not
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
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.
solenoid does not
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
position) from vehicle exterior.
Adjust or replace damper cylinder.
Adjust lower lock. Lubricate upper latch
bolt. Adjust upper latch height.
Place switch in open position.
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.
Close emergency valve.
Check latch bolt ground on door frame. If
needed clean locks for better contact.
Check ground circuit.
Reverse air hoses at solenoid locks.
Replace relay.
REMEDY
manual door locks (open
manual door locks (open