
6.2.4
Diagnostic Code Table
Symptom
No Function
1X Flash (F 01)
No combustion achieved after
start and repeat start
2X Flashes (F 02)
Flame-out during operation
3X Flashes (F 03)
Low voltage for more than 20
seconds
4X Flashes (F 04)
Flame sensor permanently hot
6X Flashes (F 06)
Temperature sensor
7X Flashes (F 07)
Fuel metering pump
8X Flashes (F 08)
Combustion air fan
9X Flashes (F 09)
Ceramic igniter (glow pin)
10X Flashes (F 10)
Temperature limiter
12X Flashes (F 12)
Control Element
(Temperature Controller)
Probable Cause
Electrical wiring, fuses
Control unit
Fuel system
Combustion air
Burner
Fuel supply (shortage)
Burner
Electrical system
Defective flame sensor
Wiring
Defective temp. sensor
Wiring
Defective fuel pump
Wiring
Wrong RPM
Defective fan motor
Wiring
Defective igniter
Overheat condition
Air flow
Wiring
Defective limiter
Wiring
Defective controller
Check and Correct
Fuses
Battery connections
Power at red wire and ground at heater brown wire
Consult your Webasto specialist
Fuel level - No fuel - Fuel system not primed
Type of fuel being used
Plugged fuel filter - replace
Fuel line connections and clamps (air bubbles in fuel lines)
Air intake or exhaust - restricted or plugged
Clean or replace burner unit
Restriction in fuel system
Plugged fuel filter - replace
Fuel line connections and clamps (air bubbles in fuel lines)
Type of fuel being used
Clean or replace burner unit
Load test batteries
Corrosion at connections
Loose connections
Replace flame sensor
Damaged or corroded wiring, open or short circuit
Replace temperature sensor
Damaged or corroded wiring, open or short circuit
Replace fuel pump
Damaged or corroded wiring, open or short circuit
Replace combustion air fan motor
Replace combustion air fan motor
Damaged or corroded wiring, open or short circuit
Replace ceramic igniter
Switch heater off and back on (see air flow)
Motor/fan obstruction, heating air flow blocked
Damaged or corroded wiring, open or short circuit
Replace temperature limiter
Interruption or short circuit
Replace control element
Table 6-1: Diagnostic Codes - Air Top 5000 Diagnostic
A
IR
T
OP
5000
6
M
AINTENANCE
/T
ROUBLESHOOTING
6-3