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Intergas HRE / Rapid / ECO RF fault codes

10 codes from the Intergas manual for the HRE / Rapid / ECO RF gas boiler. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
1Temperature too high
2S1 and S2 interchanged
24Sensor fault S2
27Shortcut outside sensor
3Ventilation
4No flame signal
5Poor flame signal
6Flame detection fault
7Frost protection active (pre heating heat exchanger)
8Incorrect fan speed