PREVOST X3-45 - Troubleshooting and Maintenance

Other Features
72
Failure Symptom Probable Cause Check and Correct
1X Flash (F 01)
No combustion after
completion of start up
sequence.
- Fuel system
- Combustion air
- Electronic ignition
- Fuel level
- Type of fuel being used
- Fuel filter
- Fuel line connections (air bubbles in fuel lines)
- Fuel nozzle plugged
- Air intake or exhaust, restricted or plugged
- Incorrect electrode gap
2X Flashes (F 02)
Flame out during
burner operation no
restart possible
- Fuel supply (shortage of fuel) - Restriction in the fuel system
- Fuel filter
- Fuel line connections (air bubbles in fuel lines)
- Type of fuel being used
3X Flashes (F 03)
Low voltage for more
than 20 seconds
- Electrical system - Load test batteries
- Corrosion at connections
- Loose connections
4X Flashes (F 04)
Flame detector
recognizes false flame
signal during pre-start
or shut-down cycle
- Defective flame detector - Replace flame detector
5X Flashes (F 05)
Flame detector
- Wiring
- Defective flame detector
- Damaged wiring, open or short circuit
- Replace flame detector
6X Flashes (F 06)
Temperature sensor
- Wiring
- Defective temperature sensor
- Damaged wiring, open or short circuit
- Replace temperature sensor
7X Flashes (F 07)
Fuel solenoid valve
- Wiring
- Defective solenoid valve
- Damaged or corroded wiring, open or short
circuit
- Replace solenoid valve
8X Flashes (F 08)
Combustion air fan
motor
- Wiring
- Wrong RPM
- Defective combustion air fan motor
- Damaged wiring, open or short circuit
- Replace combustion air fan
- Replace combustion air fan
9X Flashes (F 09)
Circulation pump motor
- Wiring
- Defective circulation pump motor
- Damaged wiring, open or short circuit
- Replace circulation pump motor
10X Flashes (F 10)
Temperature limiter
- Overheat condition
- Coolant flow
- Wiring
- Defective temperature limiter
- Reset temperature limiter
- Coolant level or flow restriction
- Air trapped in coolant circuit
- Damaged or corroded wiring, open or short
circuit
- Replace temperature limiter
11X Flashes (F 11)
Electronic ignition coil
- Wiring
- Defective electronic ignition coil
- Damaged wiring, open or short circuit
- Replace electronic ignition coil
12X Flashes (F 12)
Heater lock out
- 3 repeated faults/flame-outs or
5 repeated start attempts
- Reinitialize control unit by switching heater on
and disconnecting power.
TROUBLESHOOTING AND MAINTENANCE
The diagnostic code system in Webasto timers
is standard. Refer to the Maintenance Manual
and to Webasto manual for more information.
NOTE
If there are no heater faults, the heater will go
through a normal start cycle and regulate
based on thermostat setting.
NOTE
Switch on the preheating system briefly about
once a month, even during the warm season.
CAUTION
When welding on the vehicle, disconnect the
preheater module connector in order to protect
this system from voltage surges.