UniControl 9
7 Troubleshooting
7.1 Fault code output
The heater will output a fault code on the control
element if a fault occurs during heating mode.
Pressing the quick start button confirms the error
display.
An error that has occurred is shown on the control
element display as Txx, Fxx or Hxx and the quick
start button flashes red. The error information is
stored in the error memory. Stored errors can be
shown in the menu under “Settings”.
You will find further information in the operating
instructions.
Table of internal control element errors “Txx”
Fault code Faults Fault description Troubleshooting
Ted Supply voltage too high Supply voltage exceeds 36V. Check car electrical installation.
Te3 Display background illumination faulty
- Contact Webasto service workshop
Te4 Defective LED status
T12 Communication error on the W-bus - Check installation.
Te7/Te8 - - Contact Webasto service workshop
Tea Faulty feedback signal from heater (ST) - Check installation.
Tec Control knob sticking Control knob pressed for longer than 10 seconds. Contact Webasto service workshop
T46 Excess current/short circuit at switch output Current exceeds 500mA.
Check installation. Ensure that the consumer at the
switch output is not drawing more than 500mA.
Te0 Reduced voltage Supply voltage is below value set by technician.
Charge the battery and check car electrical instal-
lation.
T84 Operating voltage too low Supply voltage is less than 8V.
Te1 Ambient temperature too low or too high
Ambient temperature is outside the operating range
of -20°C to +70°C.
The error disappears automatically when the
ambient temperature is once more within the range
of -20°C to +70°C.
Teb RTC fault -
In case of voltage interruption lasting more than 8
minutes: Enter day/time again.
If this error appears without voltage interruption:
Contact Webasto service workshop
Tee - - Contact Webasto service workshop
Errors relating to a connected heater
Fault code Faults Fault description Troubleshooting
F01 to F15
F01 to F99
Heater error (analogue)
See workshop manual for heater Contact Webasto service workshop
H01 to Hxx Heater error (W-bus)
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