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Worcester A21 Error Code? DO THIS TO FIX!
A21 Error Code Worcester Bosch Boilers
Worcester Comfort 2 (II) RF A21 Fault Fixed | Worcester Greenstar CDi & Si Compact Models
Worcester Comfort+ 2 RF Thermostat Pairing Fault Fixed | Worcester Greenstar 8000 & 2000 Models
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Last Updated: May 26, 2026
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