6.2.2
Heater Emits Black Smoke from Exhaust
Check the combustion air intake tube and exhaust tube for obstructions or damage. Clear obstructions as necessary or
replace damaged tubes. Should condition persist, consult your Webasto specialist.
6.2.3
Self-Diagnostic System (Reading Flash Codes)
A flash code will be generated on the indicator light of the control element or a code will be entered on the face of the
optional 7-day timer. These codes indicate a malfunction and subsequent operational interruption. There are ten codes
available depending on the nature of the malfunction (see table 6-1).
In order to make a correct analysis, it is necessary to understand the flash code event. The flash code pertains to the
control element (switch) only. The flash code is only visible during the after-run (cool-down) period of operation (an
optional timer will hold the last code in memory until corrected, see “F” codes in parentheses on table 6-1).
During the flash code event, you will see five quick flashes followed by a slower sequence of flashes from one flash to ten
flashes. The slower sequence of flashes is the actual malfunction code. The five quick flashes are only an indication that
a malfunction has been detected and that the code will be displayed. Count only the slower sequence of flashes to
obtain the current malfunction code.
For example (
= one flash):
Event code 4X (F 04):
....
....
....
....
The fast/slow sequence will be repeated until the heater completes the after-run (cool-down) cycle after which, the code
will be stored in the control unit memory.
Storing a Fault Code in Memory
Once the Air Top 5000 heater completes the after run (cool down) period initiated by a failure event, the current flash
code will be downloaded (stored) in memory. The Air Top 5000 heater can store up to four fault codes. Once the
memory is “full”, any additional fault code will replace the earliest code stored thereby continually updating the fault
codes stored in memory with the four most recent faults.
Reading and Removing Fault Codes Stored in Memory
It is possible to read and remove (reset) stored fault codes from the Air Top 5000 heater memory. This is achieved
through the use of a diagnostic interface kit connected to the Air Top 5000 heater and an PC compatible computer which
has the necessary software installed.
In addition to working with stored fault codes, the PC Diagnostic Interface Kit allows you to do several other functions
such as reading values while the heater is in operation or testing individual components. Printing out of fault codes is
also available (User supplied printer required).
For more information about the PC Diagnostic Interface Kit, please consult your Webasto specialist.
ATTENTION!
Specialized diagnostic equipment is required to read malfunction codes stored in the control unit memory. Consult your
Webasto specialist for details.
ATTENTION!
After any correction of a malfunction, a functional test has to be performed with the heater installed in the vehicle.
ATTENTION!
Ambient air temperature must be below the set point on the control element knob before heater will start operation.
6
M
AINTENANCE
/T
ROUBLESHOOTING
A
IR
T
OP
5000
6-2