503
Thermo E+ 120/200/320 5 Troubleshooting
5.4 Malfunction code output via flash
code
The error cause is outputted as a flash code via the
operating display.
After five short signals the long flash signals are
counted.
The number of long flash impulses corresponds to the
respective flash code. Flash codes and their respective
error meaning are presented in Table 502.
Error in the fuel supply
No fuel delivery to the heater. • Fuel tank empty.
• Bent, closed, clogged or
leaking lines.
• Paraffin deposits or frozen water entrapments in fuel
filter or lines
• Venting opening in tank clogged
• Fuel lines mixed up
• Fuel filter contaminated
• Fuel pump, fuel filter and fuel lines not bleeded (in
particular single-pipe operation)
Error in the combustion
CO
2
value cannot be adjusted to nominal value.
Irregular combustion
• Air bubbles in fuel supply line (leaking fuel supply line or
resistance / negative pressure in the suction line too
high).
• Fuel filter contaminated or leaking
• Paraffin deposits or frozen water entrapments in fuel
filter or lines
• Fuel integration leaking (suction lift, low pressure in
tank), observe installation instruction
• Fuel pump defective (pump pressure)
• O-ring seal on fuel pump ineffective (leaking or
O-ring is absent
• Fuel nozzle defective or non-proper fuel nozzle
• Combustion air and exhaust lines throttled or closed
• Application air / exhaust does not match to the
environmantal altitude (geodesic altitude)
• Burner motor speed too low
• Coupling defective
• Fuel return partially or completely closed
Table 501 General error symptoms
Error symptom Possible cause
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