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F.27

Safety switch-off: Flame simulation

Vaillant ecoTEC Pro 24 Combi

Possible cause
Monitoring electrode reports an incorrect flame
Measure
Check: Gas pressure at upper test opening, monitoring electrode, PCB, gas solenoid valve.
This code also applies to:
ecoTEC Pro 28 CombiecoTEC Pro 30 Combi
Source: Manufacturer manual (PDF)
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