Rinnai E110CN Installation & Servicing Instructions Manual page 80

15.2.14
80
Error 28
the fan is not
fuse is working
and the error is
repeated
wiring and voltage
are OK and error
is repeated
if necessary,
replace the fan
no signal from the fan
spinning
check fuse F3, this fuse is positioned in the
control unit and can be seen once the black
covering lid has been removed
check the wiring to the fan and the control unit
and/or the 24 volt power supply to the fan
check for any possible contamination, which
might be impeding the fan impeller or check
the air temperature in the airbox. When
temperature is higher than 158°F find cause
and take precautions for repeating