PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 22: HEATING AND AIR CONDITIONING
PA1553
12
There is also a « Pressure switch » adjusted to 350 PSI that acts to
stop the compressor in the instance that the Multiplex module fails.
7.4 HVAC SYSTEM TROUBLESHOOTING
Problem/Symptom Probable Causes Actions
No temperature control in the
cabin area
Cabin temperature display
indicates two dashes "--"
Problem with the temperature
sensor located
on L.H. side of
vehicle, underneath the wire
mesh opening in the floor
or the
sensor wiring
Driver must manually control the temperature
by playing with the cabin set point. Set above
22°C (72°F) to heat and below 22° C (72°F)
to cool
Defroster fan not functioning
Module A47 is not powered or is
faulty
1. Check the SYSTEM DIAGNOSTIC menu
of the message center display (MCD).
Select FAULT DIAGNOSTIC and
ELECTRICAL SYSTEM. The message
“Voltage Module A47, Value too Low,
Active” confirms a power problem on the
module
2. Check / reset circuit breaker CB2
3. Check / replace fuse F5
HVAC condenser fans not
functioning in speed 1
Circuit breaker CB5 was manually
tripped and not reset
Seized bearing
Faulty brushes
Bad wiring
Check / reset circuit breaker CB9
HVAC condenser fans not
functioning in speed 1
Module A54 is not powered or is
faulty
1. Check the SYSTEM DIAGNOSTIC menu
of the message center display (MCD).
Select FAULT DIAGNOSTIC and
ELECTRICAL SYSTEM. The message
“Voltage Module A54, Value too Low,
Active” confirms a power problem on the
module
2. Check / reset circuit breaker CB7
3. Check / replace fuse F67 , F68
HVAC condenser fans not
functioning in speed 2
Circuit breaker CB5 was manually
tripped and not reset
Seized bearing
Faulty brushes
Bad wiring
Check / reset circuit breaker CB5
Defroster fan is functioning
but no heat or cooling
available in the driver’s area
Module A46 is not powered or is
faulty
Faulty speed control
Bad wiring
1. Check the SYSTEM DIAGNOSTIC menu
of the message center display (MCD).
Select FAULT DIAGNOSTIC and
ELECTRICAL SYSTEM. The message
“Voltage Module A46, Value too Low,
Active” confirms a power problem on the
module.

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English