Webasto Thermo Top Pro 120 Workshop Manual page 18

6 | Malfunctions and troubleshooting
6.6.1 Troubleshooting with error code output
*: Indicator lamp of control element flashing:
count the number of long flash pulses after 5 short flash pulses.
Analogue Fault code
fault code (hexa-
decimal)
F00 H01
or H07
0* H13
H16
H18
H20
H26
H81
H91
H92
H2C
H3F
HA0
HA6
HAC
HAD
HAE
F01 H02
or H82
1* H83
F02 H03
or
2*
F03 H04
or H84
3*
F04 H05
or H85
4*
F05 H1A
or H9A
18 / 49
Fault message / Possible causes
Symptom
No component fault Fuses
Electrical wiring
Electrical wiring vehicle
blower
Heater lock-out
ADR function (if in-
stalled)
Battery disconnector
(BTS) (if available)
Control unit defective
No start Fuel supply
Burner head
Flame failure Fuel supply
Flame monitor
Burner head
Overvoltage Power supply
or undervoltage
Flame was detected Fuel pump solenoid
prior to combustion valve defect
Flame monitor Flame monitor defect
Recommended action in workshop
1. Check fuses:
F1, F2 and F3
2. Check battery connections:
At connector X2: - at pin 2 / + at pin 1 (heater
voltage)
3. Check control element and
test connector contacts:
W-bus connection:
contacts X4, pin 2
Analogue connection:
connector X4: + at pin 1 / + at pin 7
(if present)
4. Check wiring of vehicle fan
for damage,
break and short-circuit,
see wiring diagram
5. Delete heater lock-out
(Rectify cause)
6. Check auxiliary drive input: S5,
Y2, see wiring diagram with ADR
7. Check Dynamo Plus input: X4,
pin 3 and pin 4
8. Check connections BTS
, replace BTS if necessary. See
wiring diagram with BTS
9. Replace control unit
1. Check fuel supply (tank empty, fuel lines clogged)
2. Check fuel filter
3. Check tank extracting device and fuel line for
leaks
4. Bleed fuel system
5. Check ignition electrode distance
6. Clean baffle plate, replace if necessary
7. Replace fuel nozzle
8. Fuel pump, check solenoid valve
9. Check fuel pump, replace if necessary
1. Check fuel supply (tank empty, fuel lines clogged,
fuel line only partially filled)
2. Check fuel filter
3. Check tank extracting device and fuel line for
leaks
4. Bleed fuel system
5. Flame monitor
6. Clean baffle plate, replace if necessary
7. Replace fuel nozzle
8. Fuel pump, check solenoid valve
1. Check battery
2. Check charging voltage
3. Check electrical connections
1. Visual check burner head, clean if necessary
2. Check solenoid valve
Replace control unit
9039412C Workshop manual TTP 120 _ 150