503
Thermo 230 / 231 / 300 / 301 / 350
5 Troubleshooting
5.3
Fault Symptoms during Functional
Checkouts and Error Code Output or
Tests with Diagnostic Computer,
Components Tester or PC Heater
Diagnosis
5.3.1 General
Error Code Output
NOTE:
Only heaters with a control unit 1572D provide an error
code output.
When equipped with a standard timer an error code
readout is available after a malfunction on the display of
the timer.
When the heater is operated by means of a switch a
coded flashing of the operating indicator light during
run-down of the heater or until switch-off indicates the
type of error (see
).
Diagnostic Computer
NOTE:
Checks with the diagnostic computer may only be
performed on heaters equipped with control unit 1572.
By use of the diagnostic computer heaters may be
checked in the vehicle. The following tests are available:
•
indication of measured values: water temperature,
control unit supply voltage, flame sensor bright/dark.
•
indication and erasure of faults stored in the control
unit.
Operation of the diagnostic computer is menu controlled
by means of four push button switches.
For details refer to operating instructions for "Diagnostic
Computer".
Components Tester
NOTE:
Checks with the components tester may only be
performed on heaters equipped with control unit 1572.
Using the components tester several types of faults and
component malfunctions may be analyzed in the vehicle.
The test of the individual components with the compo-
nents tester is not intended. Faults like short or open
circuits may be detected with the components tester but
cannot be localized.
For details refer to operating instructions for "Components
Tester".
PC Heater Diagnosis
By use of the PC heater diagnosis heaters (with control
unit 1572 or 1572D) may be tested in the vehicle.
For details refer to operating instructions for "PC Heater
Diagnosis".
The up to date software is in the internet available.
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).
•
Fuel filter contaminated or leaking.
•
Fuel integration leaking (suction lift, low pressure in
tank), observe installation instructions.
•
Fuel pump defective (pump pressure).
•
Return line throttled
•
Screen (filter) in fuel pump contaminated.
•
O-ring seal on the fuel pump ineffective (aging
prozess).
•
Atomizer nozzle defective.
•
Combustion air and exhaust lines throttled or closed.
•
Burner motor speed too low.
Fig. 501 General Fault Symptoms (Sheet 3 of 3)
Error symptom
Possible cause
Summary of Contents for spheros thermo 230
Page 70: ...memos...
