Error Lockout - Webasto Air Top 3500 Workshop Manual

3 Functional Description
3.7

Error Lockout

The control unit detects malfunctions of individual heater
components and errors in the start sequence and in
heater operation. The heater is switched off and enters
error lockout under the following conditions:
• control unit error
• no start
• flame-out
• premature flame detection
• temperature sensor open circuit or
temperature sensor short circuit
• glow plug/flame sensor open circuit or
glow plug/flame sensor short circuit
• fan motor open circuit or
fan motor short circuit or
fan motor wrong speed
• dosing pump open circuit or
dosing pump short circuit
• temperature limiter open circuit or
temperature sensor short circuit
• overheating
• voltage too low, less than 10 Volt or
• voltage too high, more than 15 Volt for longer than
20 seconds (12 Volt heaters)
• voltage too low, less than 20 Volt or
• voltage too high, more than 30 Volt for longer than
20 seconds (24 Volt heaters)
• control element open circuit
Switch off is identical as described in "Switch off". In case
of overheating there will be no fuel delivery.
After run-down the control unit will be in error lockout. The
control element will display a flash code.
For error lockout reset switch off heater (at least for
2 seconds) and switch on again.
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Air Top 3500/5000