Thermo Top Evo 5 Troubleshooting
511
5.7 Faults without fault entry in control unit
NOTE
Before each repair on the heater, the fault memory must be
read out with the Webasto Thermo Test PC Diagnosis. Exist-
ing faults must be printed before deleting and made availa-
ble to the Webasto Hotline or the Warranty Department.
At low temperatures and with no wind, a minor amount of
smoke and/or a slight odour may be noticeable during start-
ing and/or burn-out.
The occurrence of fog with an exhaust system not warmed
through or in case of unfavourable weather conditions is
normal and cannot be avoided.
Smoke: exits directly from the exhaust end section.
Fog: becomes visible just a few centimetres after
the exhaust tailpipe.
Possible faults
The overview only shows some of the possible faults. The
Webasto Service Hotline must be contacted in individual
cases.
Fault Description Possible fault
point
(see Table Fig. 504)
Heater does not react 1, 2, 3, 4, 14
Heater does not heat 5, 6, 7, 8, 10, 12
Heater switches off prematurely 1, 5, 7, 10, 12
Heater has intermittent combus-
tion
5, 8, 10, 12
Heater smokes in start-up phase 5, 8, 10, 12
Telestart cannot be tuned 1, 3, 4, 14
Heater running, vehicle passen-
ger compartment cold
7, 9, 11, 13, 16
Heater smokes in heating phase/
white smoke
5, 7, 8, 10, 12
Heater smokes in run-on phase 5, 10, 12
Fuel odour 5, 6, 7, 8, 10, 12
Exhaust odour in passenger com-
partment
5, 6, 7, 8, 10, 12
Coolant loss 9, 11
Fig. 503 Overview of possible faults
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