10. What to do if the device fails
In the case of the device failure, the following list may help to determine its location. Generally, its
removal is fairly easy. The most frequently occurring problems are listed below. The numbers indicate
possible causes for failure. The order of the numbers shows the probability of a given failure
occurrence.
NOTE:
Prior to performing any maintenance or repair activity of the device, disconnect its power
plug from the power socket.
FAULT
CAUSE
The pump does not start and the operation indicating lamp does not light up 6-3-7
The fire goes out and the pump still does not operate
2-5-9-10-12
The combustion chamber rumbles.
10-11-12
Soot appears in the combustion chamber and the stack.
8-9-10-11-12
Unburnt oil remains on the furnace bowl.
8-9-11-12
No.
CAUSE
SOLUTION
1
No power supply.
• Check if the plug is in the socket
and check the fuses.
2
Water or deposit in the tank.
• Clean the tank and filter.
3
The pump motor does not turn on.
• Check STB and overflow protection.
4
The motor and pump do not operate.
•
The fuel is too thick or too cold. Dilute with
diesel oil.
•
Check the pump control thermostat and
replace it if needed.
•
Check the motor and see if the pump is not
soiled on the inside.
•
Check STB and overflow protection.
5
The fuel ducts is obstructed, oil
returns to the tank through the primary
duct.
• Clean the fuel duct and replace it if needed.
6
The pump operation control thermostat
has not reached proper temperature.
•
Wait until the furnace cools down and restart it.
•
Replace the thermostat.
7
The overflow protection is full.
• Clean it.
8
The safety thermostat (STB) does not
operate properly or at all.
•
Reset the thermostat by pressing it.
•
Replace it.
9
Insufficient combustion air
supply.
•
Clean the furnace chamber openings.
•
Check proper operation of the fan.
10
Improper draught.
•
Check if the stack pipe is mounted according to
recommendations entitled: “Stack ducts
installation”.
•
Check tightness of the stack system.
•
Clean if necessary.
11
The stack draught is too strong or
alternates to much.
• Install the draught stabiliser and adjust it to
min. 2 mm W.C. (19.6 Pa).
12
The stack draught is too weak.
•
Check all connections.
•
Decrease the number of bends.
•
Elongate the stack.
•
Insulate the stack pipe outside the building.
•
Review all information regarding the stack duct
in the Manual.
