509
Thermo plus 160/230/300/350 5 Troubleshooting
5.5.5 Error symptom "Flameguard defective"
The flameguard cannot be replaced. It can only be tested
using STT diagnosis.
In case of damage or if the target value cannot be
reached, the control device must be replaced as needed.
5.5.6 Error symptoms "Temperature sensor /
overheating protection defective" and
"Overheating"
5.5.7 Error symptom "Circulating pump
defective"
The "Circulating pump defective" error can also be trig-
gered by dry operation of the circulating pump.
Are the temperature sensor 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 bled?
Is a circulating pump connected and
the direction of rotation of the
circulating pump correct?
Is the coolant cold-resistant?
Replace control device.
Correct error and/or replace the
component.
Correct error
NO
YES
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