21
Fault
Cause
Rectification
Yellow LED flashes 2 x
– Overvoltage > 16.4 V
– Check battery voltage and voltage sources such as the
charger
(Only with Combi E)
– No 230 V operating voltage
– 230 V fuse defective
– Overheating protection has been
triggered
– Restore 230 V operating voltage
– Replace 230 V fuse
– Reset overheating protection, allow heating system to cool,
remove connection cover and press reset button
Yellow LED flashes 3 x
– Open window above cowl
(window switch)
– Close window
Yellow LED flashes 4 x
– Warm air temperature and / or
water temperature exceeded:
– Not all warm air ducts are
connected
– Warm air outlets blocked
– Circulated air intake blocked
– Check whether the 4 warm air ducts are connected
– Check individual outlet apertures
– Remove blockage from circulated air intake
– Summer mode with empty
water container
– Fill boiler with water
Yellow LED flashes 5 x
– Room temperature sensor or
cable defective
– Please contact Truma Service
Yellow LED flashes 6 x
– Water temperature exceeded in
summer mode
– Fill boiler with water
Yellow LED flashes 7 x
– Control panel or control panel
cable defective
– Please contact Truma Service
Yellow LED flashes 8 x
– FrostControl heating element
has a short circuit
– Disconnect heating element plug from electronic control unit,
replace heating element
If these actions do not remedy the problem, please contact Truma Service.
