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error Worcester
Error Code A22
No RF Signal or Pairing Fault.
? What Causes This
Pairing process was not completed successfully due to obstruction, interference or failure in the RF communication system.
✓ How to Fix It
Repeat pairing processes, check room thermostat’s signal strength using settings menu S 2 - Turn knob to select A for pairing and d for unpairing during appropriate steps.
Source: page 19 of the official manual
From the manual
This error code appears in:
Worcester Greenstar Comfort II RF