5 Troubleshooting Thermo Top E and Z/C
502
5.2 Error Messages during
Functional Test with Diagnosis Tester
Thermo Test
NOTE
The following table (Fig. 502) lists possible error
messages during the functional test with the diagnosis
tester and their probable cause.
Fig. 502 Error Messages (Sheet 1 of 2)
Error Message Probable Cause
Control unit defective • Faulty electronics
• EOL programming error
Flame-out 1 Flame-out during operation and no flame-up after a new attempt to start
• Wrong integration in fuel system (e.g. fuel supply confused with return)
• Fuel tapping dependent on fuel level
• Pressure in fuel system too low
• Check valve in fuel system
• Leak in fuel line connections
• Degassing fuel lines (routed in environment too hot)
• Installation orientation of dosing pump
• Combustion air intake not as specified
• Exhaust system not as specified
• Burner defective
Flame-out 2 Several flame-outs during operation
• Wrong integration in fuel system (e.g. fuel supply confused with return)
• Fuel tapping dependent on fuel level
• Pressure in fuel system too low
• Check valve in fuel system
• Leak in fuel line connections
• Degassing fuel lines (routed in environment too hot)
• Installation orientation of dosing pump
• Combustion air intake not as specified
• Exhaust system not as specified
• Burner defective
Voltage too high
• Vehicle battery charger probably defective
Voltage too low
• Battery discharged or defective
• High transition resistance in the power supply lines (plus and minus)
Flame before combustion
operation (not applicable for
Thermo Top Z)
• Glow plug / flame sensor defective
Overheating
• Coolant level too low
• Heater has not been bled
• No circulation
Dosing pump short circuit • Ground short in power supply line to dosing pump
Dosing pump open circuit
• Open line to dosing pump
• Short circuit to plus of power supply
Burner motor short circuit
Thermo Top Z:
• Switched line short circuit to plus of power supply
• Overload or short circuit of burner motor
Thermo Top E und C:
• Ground short in power supply line to burner motor
Burner motor open circuit
• Open line to burner motor
• Short circuit to plus of power supply
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