Ferroli Optima 701 boiler model.
Got a problem with central heating...the boiler is failing to fire...or
firing for a few seconds then dying (this is on constant 'heating' with
the timer overridden).
Water through hot taps is generally OK, though sometimes it misfires as
The thermocouple looks a bit 'bright' through the viewing window. Does
this seem likely to be the problem?
Everything else seems fine, no noises or problems when the boiler's
What do you mean 'the thermocouple is a bit bright'? I presume you mean the
pilot light? The only way to check the thermocouple is to measure the small
voltage produced by it when it is heated by the pilot. From memory this is
about 30-40 millivolts.
Yes, the end of the thermocouple fitting where the pilot light is.
Instead of being black/grey, it's like when you blow out a match and it
stays red for a few seconds, but it's like that all the time. Carbon?
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