Operating instructions

6.3 Heater Lockout Reset Procedure
The TTC is designed with a lockout safety feature built in to the control unit. After 3 consecutive
unsuccessful startup attempts, the heater will lock itself out from any further start attempts. The
heater may also enter the lockout mode after experiencing an overheat condition.
The following procedure will clear the lockout mode and reset the heater for normal operation:
1. Remove fuse F1 (15 Amp), refer to wiring diagram figure 411 for identification.
Wait 10 seconds before reinserting. This is done to prepare the control unit for resetting.
2. Wait a further 10 seconds after reinserting fuse F1. Now turn the heater on using the On/Off
switch or the fiinstan onf button of the optional timer.
3. Wait 10 seconds after turning the heater on and remove fuse F1 again.
4. Wait a further 30 seconds and then turn the heater off at the switch or optional timer.
5. Reinsert fuse F1 after waiting 3 to 10 seconds of shutting off the heater.
6. Wait a further 10 seconds and turn the heater back on again.
The lockout mode should now be canceled and the heater operating normally.
6.4 PC Diagnostics Kit
It is possible to read and remove (reset) stored fault codes from the TTC memory.
This is achieved through the use of a diagnostic interface kit connected to the TTC and an IBM
compatible computer having the necessary software installed.
The PC Diagnostic Interface Kit comes complete with connecting hardware, software and
instructions. Also available are several interface connectors for use with Webasto heaters equipped
with internal diagnostics capabilities such as theTTC.
Order PC Diagnostics Kit under part number 9009064C.
Kit does not include required adapter, please order adapter under part number 92566B.
In addition to working with stored fault codes, the PC Diagnostics 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 further capabilities and instructions for use with the TTC heater, see instruction manual
supplied with the PC Diagnostics Kit.
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6 Basic Troubleshooting Thermo Top C (TTC)
CAUTION
Diagnostics equipment is intended for use by Webasto trained personnel at authorized Webasto
Distributor, Dealer and End User service facilities.