Toyotomi OPT-91UL Service Manual page 24

Sufficient amount of
fuel is not fed to
the heater.
Flow valve
left closed.
No
Outlet side
piping plugged
No
Excessive
consumption
fuel by heater(s).
Yes Open the
flow-out valve.
Yes Remove stuck
substances from
the piping.
Appropriate number of
lifters which meet
fuel consumption rate
to be installed.
24