Webasto Thermo Top Pro 120 Workshop Manual page 19

*: 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)
5*
F06 H14
or H93
6* H94
F07 H08
or H88
7*
F08 H09
or H15
8* H89
H95
F09 H19
or H99
9* H2E
F10 H06
or
10*
F11 H0B
or HC0
11* HC1
HC2
HC3
HC4
F14 H1B
or HAB
14*
F16 H4F
or H5B
16*
F17 H4D
or H31
17*
9039412C Workshop manual TTP 120 _ 150
Fault message / Possible causes
Symptom
Short circuit of Coolant temperature
coolant temperature sensors wiring defective
sensors
Coolant temperature
sensors
Fuel pump solenoid Fuel pump solenoid
valve short-circuit in valve defect
electrical circuit
Fan drive motor Fan lock-up protection
short-circuit or break
Ignition spark circuit Ignition spark generator 1. Check wiring and connector for damage, break
is defective
Heater overheats Coolant temperature
sensors defective
Coolant system
Coolant pump short- Coolant system
circuit or break
Coolant pump defective 5. Check wiring for damage, break and short-circuit
Coolant temperature Wiring defective
sensors breaks or
short-circuits
Coolant temperature
sensors defective
Exhaust gas temper- Exhaust gas temperat-
ature too high ure sensor defective
Heater fouled
Ambient temperature of
heater too high
Control unit defective
Exhaust gas temper- Wiring defective
ature sensor
Malfunctions and troubleshooting | 6
Recommended action in workshop
1. Check wiring for damage and short-circuit
2. Carry out function check of coolant temperature
sensors, replace if necessary
1. Check wiring and connector for damage, break
and short-circuit
2. Check solenoid valve, replace fuel pump if neces-
sary
1. Rectify cause of block and sluggishness
2. Check wiring and connector for damage, break
and short-circuit
3. Check operation of drive motor, replace if neces-
sary
and short-circuit
2. Check ignition spark generator, replace if neces-
sary
1. Check wiring for damage, break and short-circuit
2. Measure resistance of coolant temperature
sensors, replace coolant temperature sensors if ne-
cessary
3. Check coolant level, bleed coolant circuit
4. Carry out function check of coolant pump, re-
place if necessary
5. Check wiring and connector for damage, break
and short-circuit
1. Check coolant level
2. Check coolant flow
3. Bleed coolant pump. Rectify possible cause
4. Check anti-freeze in the coolant, change coolant
if necessary
6. Carry out function check of the coolant pump,
replace if necessary
1. Check coolant temperature sensor wiring and
connector for damage
2. Check coolant temperature sensors
1. Check wiring and connector of exhaust gas tem-
perature sensor for damage, replace if necessary
2. Measure resistance of exhaust gas temperature
sensor, replacing if necessary
3. Visual inspection with cleaning of inner surface of
heat exchanger, replace if necessary
4. Allow the heater to cool down, check temperat-
ure and ventilation of installation space (see installa-
tion instructions)
5. Replace control unit
1. Check wiring and connector for damage, break
and short-circuit
19 / 49