Spheros Thermo S 160, Workshop Manual

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Thermo S 160/230/300/350/400 5 Troubleshooting and error correction
509
5.4.5 Error symptom "Flame detector defective"
The flame detector cannot be replaced. It can only be
tested using SST diagnosis.
In case of damage or if the target value cannot be
reached, the control unit must be replaced as needed.
5.4.6 Error symptoms "Temperature sensor /
overheating protection defective" and
"Overheating"
5.4.7 Error symptom "Circulating pump
interruption"
The "Circulating pump interruption" error can also be
triggered by dry operation of the circulating pump.
Are the temperature sensor plugs,
contacts and cables OK?
Are the adapter wiring harness
plugs, contacts and cables OK?
Is sufficient cooling and coolant flow
ensured?
Are all shut-off devices opened?
Is the cooling system leak-tight,
completely filled and purged?
Is a circulating pump connected and
the direction of rotation of the
circulating pump correct?
Is the coolant cold-resistant?
Replace control unit.
Correct error and/or replace the
component.
Correct error and/or replace the
component.
Correct error
NO
YES