Operating instructions
26
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FFaauulltt CCooddee FFaauulltt DDeessccrriippttiioonn CCaauusseess // RReeppaaiirr FFaauulltt SSiiggnnaall // FFllaasshhiinngg CCooddee
050 Too many no start attempts The control unit is interlocked after it has been switched
on 10 times in succession (=20 failed starts) without
flame detection (fault code 052). Check the fuel supply,
glow plug, exhaust piping, combustion air piping and
flame sensor. Cancel the interlock by clearing the error
memory with the diagnostic unit/PC.
051 Faulty flame recognition Flame sensor signals a temperature of greater than
80ºC despite 4 minutes of cooling with cold air.
Impedance at flame sensor > 1300 ohm. If no
combustion takes place —> check the flame sensor,
replace it if necessary. Flame sensor values:900 ohms
at -25°C, 1100 ohms at +25°C.
052 No start safety time exceeded No flame was detected during the start-up phase.
Flame sensor value of less than 90∞C (1350 ohms).
Check the fuel supply, glow plug, exhaust piping, com
bustion air piping and flame sensor. Flame sensor
values: 900 ohms at -25°C, 1100 ohms at +25°C.
053 Flame cutout in boost mode Heater has started (flame detected) and indicates flame
loss in a power setting. Check fuel flow rate, blower
054 Flame cutout in high mode speed, fuel supply, exhaust pipe and combustion air
056 Flame cutout in medium mode piping. If combustion is O.K., check flame sensor,
056 Flame cutout in low mode replace if necessary. Flame sensor values:900 ohms
at -25°C, 1100 ohms at +25°C.
059 Water temperature rises to quickly Check water circulation (012) and temperature control
sensor (060/061).
060 Temperature control sensor interruption Control sensor signals temperature value outside
measurement range. Check the connecting leads (0.35
yellow). For this purpose, dismantle the control unit,
061 Short circuit - temperature control disconnect the internal plug from the control unit and
measure the impedance between 9 and 11. Impedance
between terminals 9 and 11 of the control unit (internal
plug): greater than 10 kohms (in the event of
interruption) less than 100 ohms (in the event of short
circuit).Temperature sensor values: 650 ohms at -25°C,
1000 ohms at +25°C.
88 sseeccoonnddss