Bonus Plus Instructions Tarm Biomass 1-800-782-9927 Version 11/14 Page 42
PROBLEM
ROOT CAUSE
Solution
Boiler stops before the fuel load is
consumed and the storage tank is
not yet fully charged.
Flue gas thermostat
The flue gas thermostat is not in place,
incorrect temperature (default 90º C) or it
is defective.
The fuel
The wood may be too long, too wet, or
poorly positioned in the upper firebox. If
the wood hangs up and does not settle, the
bottom of the fuel load burns out and the
fire goes out or is greatly reduced to the
point where the flue gas temperature drops
below the cut-off setting (I) and the boiler
shuts down. If the fuel is too wet, combus-
tion temperatures will be very low and
boiler output reduced.
Too much ash in upper firebox
Combustion can be stifled by an accumu-
lation of too much ash in the upper fire-
box. Too much ash can restrict combus-
tion air flow which will result in reduced
heat output to the point where stack tem-
perature drops too low and the boiler shuts
down.
Nothing happens when you push
the switches
No power
Check the power supply to the boiler.
Make sure the boiler is not too hot. If the
boiler exceeds 100º C, the safety thermal
fuse will trip and the boiler will not oper-
ate until the boiler temperature has
dropped well below boiler set-point tem-
perature and the thermal fuse has been
reset. Check the electrical fuse panel.
Troubleshooting > Troubleshooting Guide