28
40.020.933 - rev. 04 - 2011
AT 300 series
English
Record the maintenance details in table A in
the appendix of this manual.
The flame goes out
directly after ignition.
13 The maximum thermo-
stat is not installed prop-
erly or defective.
Reset the thermostat, see fig.
3(Q).
User
Replace the thermostat, see
fig. 3(Q).
Dealer
14 The overflow protection
is filled with waste oil.
For AT 306:
Clean the overflow protection
dish, the burner dish and the
floor of the combustion
chamber.
User
For AT 307:
Clean the overflow protection
dish, the burner dish and the
floor of the vaporiser.
User
The fuel pump does
not run and the con-
trol light is off, while
the heater is pre-
heated and the
switch is switched to
"1" or "2".
See faults: 3, 6, and 14.
The flame is extin-
guished while the
fuel pump is still run-
ning.
See faults: 2, 5, 7, 9, 10 and
12.
The heater makes a
humming sound.
15 There is too much diesel
oil at start up.
Reduce the amount of diesel
oil.
User
See faults: 10, 11, and 12.
There is soot forma-
tion in the combus-
tion chamber and in
the flue.
See faults: 8, 9, 10, 11 and
12.
There is unburnt fuel
on the burner dish.
16 There is too much diesel
oil at start up.
Reduce the amount of diesel
oil.
See faults: 8, 9, 10, 11 and
12.
Fault
Cause
Solution
Action
