5 Troubleshooting Thermo Top Evo
510
* WTT = Webasto Thermo Test PC Diagnosis
83 131 Flame failure Flame interruption during
combustion operation, more
than FAZ (EEPROM) times
In case of frequent occurrence
(> 3):
1) Troubleshooting in air
intake or in exhaust system
(see Section 5.7, Fig. 504,
Point 12)
2) Conduct troubleshooting
in fuel system (see
Section 5.7, Fig. 504,
Point 10)
3) Conduct check of meter-
ing pump (see Section 5.7,
Fig. 504, Point 5)
4) Conduct electrical test of
glow plug (see Section 5.7,
Fig. 504, Point 6)
84 132 Operating voltage too low Supply voltage was too long
below maximum threshold
value
1) Check approximate for-
mula: Does the customer
heat longer than his/her
driving time?
2) Conduct check of vehicle
electrical-system supply
voltage (also see
Section 5.7, Fig. 504,
Point 1)
87 135 Heater lock-out permanent Permanent heater lock-out
has been activated
1) Delete heater lock-out -
attempt restart
2) Read out additional fault
messages and work
through their recommen-
dation for action
92 146 Command refresh failure Command refresh failure. In
case of this fault no opera-
tion
Troubleshooting in area of W
bus communication (see
Section 5.7, Fig. 504, Point 2,
3 and 4)
9C 156 Heating time exceeded Calculated heating time
from intelligent undervolt-
age detection exceeded
1) Check approximate for-
mula: Does the customer
heat longer than his/her
driving time?
2) Check vehicle electrical-
system supply voltage
AA 170 S on W-Bus not succeed S on W-Bus not succeed (nor
or faulty response, even after
repeating telegram four
times)
Troubleshooting in area of W
bus communication (see
Section 5.7, Fig. 504, Point 2,
3 and 4)
Fault
code
(HEX)
Fault
code
(DEZ)
WTT* fault message Fault details with double-
click in WTT*
Recommended workshop
action
Fig. 502 Overview of general faults entered in fault memory
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