Fault Codes - Webasto Coolant General Operations Manual

Fault Codes

NOTE: Not all Webasto coolant heaters show fault codes.
Fault Error
Code Message
No error
F00
or
Heater Lock-
1
0*
out
F01
or No start
1*
F02
Flame failure/
or
Flame abort
2*
F03
Supply Volt-
or age Too High/
Low
3*
F04
Premature
or flame detec-
tion
4*
F05
Flame sensor
or
2
defective
5*
Temperature
F06
sensor open-
or
or short-cir-
6*
cuit
Metering/Fuel
F07
pump defec-
tive
or
Fuel solenoid
7*
2
defective
F08
Combustion
or air fan defec-
tive/blocked
8*
Possible Cause
• Fuses
• Electrical wiring
• Heater lock-out
• Control Unit Defective
• Fuel system
• Combustion air/exhaust pipe
• Burner unit
• Fuel system
• Burner unit
• Power supply
• Foreign light detected during
2
run-up or run-down
• Flame sensor defective
• Exhaust temperature sensor
1
defective
• Defective Flame sensor
• Wiring
• Coolant temperature sensor
defective
• Wiring
• Defective pump
• Wiring
• Blockage
• Defective fan
Recommended
Action
• Check fuses
• Check control
element
• Check W-bus connections (yellow
• Check fuel level
• Check fuel filter
• Check fuel extractor and fuel line for
leaks
• Bleed fuel system
• Check combustion air/exhaust pipe
• Check fuel level
• Check fuel filter
• Check fuel extractor and fuel lines for
leaks
• Bleed fuel system
• Clean/replace burner
• Check battery
• Check electrical connections
• Check flame monitor
• Check exhaust gas temperature sen-
1
sor
• Check flame sensor
• Check wiring/sensor for resistance
• Check operation of sensor
• Check wiring for damage
• Check fuel pump for operation
• Check wiring for damage
• Remove blockage
• Replace fan
Applicable Heaters
Thermo Pro 50 ECO
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo 90 ST
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90