Installation & Servicing Instructions Rinnai
15.2.14Error 28
no signal from the fan
the fan is not
spinning
check fuse F3, this fuse is positioned in the control unit and can be seen once the black covering lid has been removed
fuse is working and the error is repeated
check the wiring to the fan and the control unit and/or the 24 volt power supply to the fan
wiring and voltage are OK and error is repeated
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
if necessary,
replace the fan
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