What the manual says
Manufacturer manualTemperature sensors faulty. Cold resistance approximately 10kΩ @ 25° C (DHW and CH sensors) 20kΩ @ 25° C (Flue sensor) (resistance reduces with increase in temp.)
From this model's manual
Verified against the Baxi/Baxi Bm Baxi Megaflo System 15 18 24 28 32 He A Range Installation Servicing Instructions Manual installation & service manual.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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All 16 fault codes on the Megaflo System 15 HE A
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