E0117 – No circulation which a sensor fault might cause
E0120 – The flue temperature is over the maximum of 140 Deg C.
E0200 – The boiler is currently resetting
E0207 – System pressure less than 0.5b bar
E0216 – The CSU has timed out. This may cause damage to the PCBE0217Communication lost between the gas valve and the boiler PCBE0400Problem with the gas valve