What the manual says
Manufacturer manualMiscellaneous error. Temporary error, will self reset.
From this model's manual
This code was read directly from the manufacturer service manual for this model.
DIY fix possible
Wait up to 10 minutes for the boiler to complete its self-reset processMonitor the control panel to see if the flashing light stops and returns to steady greenIf the flashing continues, turn the temperature control knob to 'Off' and back to the desired setting to trigger a manual reset
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