Rinnai E75CN - Manual (Page 75)

Installation & Servicing Instructions Rinnai E-Series
75
remove the
voltage from the
boiler and check
fuse F2
check the 24 Volt
connections
check the
disconnected
parts for wear
and tear
rectify the short-
circuit or replace
the short-circuited
component
short-circuit 24 Volt
due to the 24 volt short-circuit inside or
outside the boiler, fuse F2 has blown. This
fuse is positioned in the control unit and can
be seen when the black covering lid has been
removed.
remove all plugs with 24 volt connections such
as: fan, pump, any three-port valve and 24 volt
plug to the connecting block
reconnect power to the control unit with the
disconnected parts. Reconnect the parts
which have been checked and are working
properly.
15.2.9 Error 12