Rinnai RHFE-557FT Manual page 18

This appliance is controlled by a micro computer. If there is something wrong with the
appliance then it will stop, as it is protected by the following safety devices.
Ignition Safety Device
Power Failure Safety Device
Burner Safety Device
Power Surge Safety Device
Overheat Safety Device Fan Delay Safety Device
Your RHFE-557FT
requires very little maintenance,
simply clean the rear fan filter once a week and
wipe the outer case and louvre section with a
damp cloth.
DO NOT USE SOLVENTS.
Solvents may melt or distort plastic parts.
Remedy
Clear obstruction
-18-