Intergas Comfort Touch Manual De Usuario página 21

Internal error thermostat Flashing 'F'
If an "E" with numerical code appears, there is a hardware error in
Boiler fault.
the thermostat. The thermostat will restart after 5 seconds. If this
An 'F' appears, possibly followed by a one-
error persists, the thermostat is defective and must be replaced.
or two-digit code. Consult boiler manual
for error code meaning.
40 41