In article .com,
"Pandora" writes:
My boiler has got this internal isolator. What is the point of it? If
you power down the boiler when you service it, you power down all the
controllers as well. Isn't there a chance they will lose their
parameter settings?

Normally any electronic controls have something like 24h battery
backup, unless the rechargable battery has died (which happens).

--
Andrew Gabriel