Operating instructions

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Fault Code Fault Description Causes / Repair
020 Glow plug 1, interruption • Measure cold resistance of the glow plug at approx. 20°C
ambient temperature – connector B1, PIN 7 and 10.
021 Glow plug 1, overload / short circuit If the values are as follows the glow plug is ok, if the values
downstream of (–) differ – replace the glow plug.
022 Glow plug 1, short circuit downstream Measured value:
of (+) • 12 volt – glow plug = 0.42 – 0.6 ohm
• 24 volt – glow plug = 1.2 – 1.9 ohm
– If the glow plug is ok, check the lead harness of the glow plug
for continuity, short circuit and damage.
023 Glow plug 2, interruption • Measure cold resistance of the glow plug at approx. 20°C
ambient temperature – connector B1, PIN 11 and 14.
024 Glow plug 2, overload / short circuit If the values are as follows the glow plug is ok, if the values
downstream of ground differ – replace the glow plug.
Measured value:
• 12 volt – glow plug = 0.42 – 0.6 ohm
• 24 volt – glow plug = 1.2 – 1.9 ohm
– If the glow plug is ok, check the lead harness of the glow plug
for continuity, short circuit and damage.
025 Diagnostic line fault • Check diagnostics cable for continuity, short circuit and
Heater remains ready for operation damage – connector B2, PIN B4.
– if ok, check control box.
026 Glow plug 2, short circuit downstream see fault code 023 / 024
of (+)
029 Glow plug 2, Ignition energy too low Glow plug 2 energy input is too low (< 2000 W)
• Check glow plug for continuity, short circuit and damage.
—> Fault code 023.
• Check control box.
033 Burner motor, interruption • Check the burner motor's connection leads for continuity, short
circuit and damage – connector B1, PIN 3, 6 and 9.
033 Burner motor, overload • Check burner motor for easy movement by manually rotating the
impeller.
– if not smooth running, remove the blockage.
033 Burner motor, speed error / blocked – if ok, replace control box / blower unit.
034 Burner motor short circuit
downstream of (+) or (–)
037 Water pump not working • Check water pump.
Apply voltage to the water pump – connector B1, PIN 12 and 13
(power input = max. 4 A or 2 A)
– If water pump does not rotate, replace water pump.
– If water pump is ok –> replace control box / blower unit.
041 Water pump, interruption • Check the water pump's connection and lead harness for con-
tinuity, short circuit and damage – connector B1, PIN 12 and 13.
– If ok, check water pump —> fault code 037.
042 Water pump
Overload short circuit Water pump running dry.
043 Water pump • Vent heater (water shortage), open heater slide valve, check
Overload downstream of +Ub water flow rate