Technical data

5.Error Search and Error Elimination DBW 2010 / 2012 / 2020 / 2022 / 300 / 350
502
Error indication Likely reason
• the system resistance is very high (increases
particularly when it is cold)
• the circulation pump is defect
The heat exchangers (water/air) provide very little heat
because
• there is air or gas in the heat exchangers or system
sections
• the heat transfer surfaces are dirty (inside/outside)
• air access/exit is insufficient
• Fan: does not blow sufficient air /its rotation direction
is wrong / resistance is too high
• anti-freeze proportion is too high
• the dimension of the heat exchanger is too small
The rough calculation of the flow amount
thermal flow according to the type label
Flow amount (l/h) =
The heat difference will be measured in terms of ǻt [K] or
[0C] at the water access or exit at the heating device (for
instance with contact thermometer)
x 860
Error in the fuel supply
No fuel coming to the heating device
• fuel tank is empty
• the pipes are broken, closed, clogged or leaking
• paraffin decomposition or frozen water in the fuel filter
or fuel pipes
• the ventilation hole of the tank is closed
• the fuel pipes are mixed-up
• fuel filter is dirty
Error in the combustion system
The CO
2
value cannot be set to the nominal value. The
combustion is disorderly
• There are bubbles in the suction pipe (suction pipe
leaks)
• The fuel filter is dirt or leaks
• There is leakage in the fuel intake (suction height,
vacuum in the tank); pay attention to the assembly
instruction
• Fuel pump is defective (pump pressure)
• The return pipe is obstructed
• The sieve in the pump is dirty
• The vaporizer nozzle is defective
• The combustion air and exhaust pipes are obstructed
or closed
• The revolution of the pump engine is too low
Figure 501 General Error Indications