Repair manual

30
Fault code Cause
Fault Description • Remedial measures
000 No fault -----------------
010 Overvoltage --> disconnection Overvoltage (>30 V) exists for a minimum of 20 seconds without interruption
at the control unit - HYDRONIC not working.
• Unplug 18-pin connector on the control unit and start up vehicle engine.
Measure the voltage between PIN 15 (red 2.5 mm² cable) and PIN 16
(brown 2.5 mm² cable) if the voltage >30 V --> check alternator controller.
011 Undervoltage --> disconnection Undervoltage (<19 V) exists for a minimum of 20 seconds without
interruption at the control unit - HYDRONIC not working.
• Pull out the 18-pin connector on the control unit, start up the vehicle
engine, measure the voltage between PIN 15 (red 2.5 mm² cable) and
PIN 16 (brown 2.5 mm² cable).
The measured value and the voltage at the battery should not deviate.
In the event of a voltage drop, check the fuses, the supply lines, the
chassis earth connections and the positive terminal connection point of
the battery for correct contact
012 Overheating Safety thermal cutout sensor temperature >130ºC
• Check water circulation system:
- Check all hose connections for leaks
- Bleed water circulation system
- Check valves in water circulation system and, if necessary, replace
- Temperature difference between water inlet and water outlet must
<10 K; if not, --> check minimum throughput of the heating medium,
see values in the Technical Data.
• Check water pump and if necessary replace
• Check safety thermal cutout sensor and if necessary replace (see diagram
on page 45)
014 Temperature difference between Difference between measured values of temperature sensor and
temperature sensor and safety safety thermal cut-out sensor above permitted limits for an extended period.
thermal cutout sensor too big • Check mounting of both sensors, if necessary, tighten up sensors,
tightening torque on both sensors 2.5 +0.5 Nm.
• Check temperature sensors and safety thermal cutout sensor (see
diagrams, pages 44 and 45).
• Check minimum throughput of the heating medium. See values in the
Technical Data.
015 Operation disable - control unit is locked Fault code 012 “Overheating” has been displayed three times in succession
--> fault code 015 displayed.
Control unit unlocked by clearing the fault memory (see pages 26 to 29).
• For remedial measures, see fault code 012.
016 Operation disable - control unit is locked Fault code 058 “Flame during delayed shutoff” has been displayed three
times in succession --> fault code 016 displayed.
Control unit unlocked by clearing the fault memory (see pages 26 to 29).
• For remedial measures, see fault code 058.
4 / Troubleshooting