VOKERA
If the Amber LED on the receiver is flashing radio contact between the room unit and the receiver has
been lost (it is therefore worth checking the battery indicator on the room unit).
A solid red LED is not a fault indication, it simply indicates the unit is powered on.
A solid amber LED indicates there is an external sensor fitted.
11: Fault codes on the OpenTherm control (room unit):
Faults codes may be displayed on the room unit, but if the heating mode is OFF, no fault code is
displayed.
For further instructions relating to fault codes and system parameters, please refer to the OpenTherm
Quick help guide on our website
A01: Ignition fault on boiler
A02: Boiler overheat
*
A03: Fan or flue problem
A04: System water pressure too low
A05: Electrical or boiler control board problem
A06: Domestic hot water sensor problem (the boiler will still produce hot water for the user while
showing this fault condition but using the flow thermistor will lock to 65°C which will provide warm water
for washing only. The temperature will not be adjustable on the room unit until repaired).
A07: Flow temperature fault
A08: Return temperature fault
A09: Flue temperature fault or service reminder (the boiler will still work as normal with a service
reminder alarm indicated.
*
Any faults shown on the room unit with an A2XX code can be reset on the boiler control only, not at
the receiver.
12: Setting the parameters on the OpenTherm Control:
There are a set of default parameters ready programmed into the OpenTherm Control
The adjustment should generally be by the engineer not the end user however there are two that the
end user may need to adjust the heating curve and the value regarding the insulation of the property.
To enter parameter or engineer mode.
Press the button
Press the button 5 times until PL appears in the screen
