What the manual says
Manufacturer manualDetected tab panel button pressed for longer than 30 "
DIY fix possible
Check all buttons on the front control panel to see if any are physically stuck in the 'in' position.Gently press and release each button to ensure they click and move freely.Wipe the control panel with a dry cloth to remove any sticky residue that might be holding a button down.Restart the boiler once all buttons appear to be released.
Avoid the next call-out bill
A cover plan would handle faults like 23: no call-out fees, no surprise bills.
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Related fault codes
All 46 fault codes on the Alkon R 28 HE
Seeing a different code? Every code this model can display, in one place.