Rinnai E110CN Installation & Servicing Instructions Manual page 69

15.2.2 Error 01
disconnect voltage
from the boiler and
check the fuse F2
as a result of a 24 Volt short-circuit inside or
outside the boiler the fuse F2 will have blown.
This fuse is placed in the control unit and
can be seen after the black covering cap is
removed.
check the 24 Volt
connection
remove all plugs with 24 Volt connections
such as: fan, pump, any three-port valve and
24 Volt plug to the connecting block.
check the
disconnected
components for
short-circuiting
switch on power again to the control unit with
the components disconnected. Reconnect the
components, which have been checked and
are working.
rectify the short-
circuit or replace
the short-circuited
component
24 Volt short-circuit
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