Webasto TSL 17 Coolant Heater
www.webasto.us 12 Webasto Product N.A., Inc.
Heater Lockout Reset Procedure
The Webasto TSL 17 coolant heater is designed with a lockout safety feature built into 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.
1. Ensure switch or optional timer is in the “OFF” position. Turn switch or timer to the “On” position. Remove main
fuse F1 (20 Amp), reinsert after 5 seconds.
2. Cycle switch or timer off and then back on once more. Remove fuse F1 once again and reinsert after 5 seconds.
Heater should attempt to start after inserting fuse.
NOTE
Coolant temperature must be below the lower threshold before heater will attempt to start.
PC Diagnostics Kit
It is possible to read and remove (reset) stored malfunction codes from the TSL 17’s internal memory.
This is achieved through the use of a diagnostic interface kit connected to the TSL 17 and a PC computer with
Microsoft Windows operating system and the PC Diagnostic software loaded.
The PC Diagnostic Interface Kit comes complete with connecting hardware including software and user’s guide on
compact disc. Order PC Diagnostics Kit under part number 1301728B.
Kit includes the required adapter for the TSL 17, Thermo Top C/Z and Air Top 2000 heaters. More adapters are
available for other Webasto heaters with internal diagnostic capabilities.
In addition to working with stored malfunction 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.
Print out capability of malfunction codes and heater data is also provided (user supplied printer required).
For further capabilities and instructions for use with the TSL 17 heater, refer to the user’s guide on compact disc
supplied with the PC Diagnostics Kit.
Basic Troubleshooting
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