6
UNICA BHE
HOW TO...
3.1
HOW TO TOP-UP THE SYSTEM PRESSURE
(fig. 2 & 3)
The system pressure must be checked periodi-
cally to ensure the correct operation of the boiler.
The needle on the gauge should be reading be-
tween 1 and 1.5 BAR when the boiler is in an off
position and has cooled to room temperature. If
the pressure requires ‘topping-up’ use the follow-
ing instructions as a guide.
●
Locate the filling valve connections (usually
beneath the boiler, see fig. 2).
●
Attach the filling loop to both connections.
●
Open the filling valve slowly until you hear water
entering the system.
●
Close the filling valve when the pressure gauge
(on the boiler) reads between 1 and 1.5 BAR.
●
Remove the filling loop from the connections.
3.2
HOW TO RESET THE APPLIANCE
When the red fault LED is illuminated, the appli-
ance will require to be reset manually. Before
resetting the boiler, check what action is required
to be taken, using the information on the fault
code table below. Allow a period of two minutes
to elapse before rotate the mode selector knob
across the OFF/RESET position.
Fig. 3
flow/return
pipe
control
valve
temporary
connection
control
valve
supply
pipe
double
check valve
Fig. 2
CODE
ACTION REQUIRED
AL10
Reset appliance. Call engineer if fault re-occurs
AL20
Reset appliance. Call engineer if fault re-occurs
AL21
Reset appliance. Call engineer if fault re-occurs
AL26
Reset appliance. Call engineer if fault re-occurs
AL28
Reset appliance. Call engineer if fault re-occurs
AL34
Reset appliance. Call engineer if fault re-occurs
AL40
Check system pressure and refill if necessary.
Reset appliance. Call engineer if fault re-occurs
AL41
Check system pressure and refill if necessary.
Call engineer if fault re-occurs
AL52
Call engineer
AL55
Call engineer
AL60
Reset appliance. Call engineer if fault re-occurs
AL71
Call engineer if fault re-occurs
AL73
Call engineer if fault re-occurs
AL74
Reset appliance. Call engineer if fault re-occurs
AL79
Reset appliance. Call engineer if fault re-occurs
APPLIANCE FAULT CODES
IMPORTANT
If the appliance requires to be reset frequently, it
may be indicative of a fault, please contact your
installer or Vokera Customer Services for further
advice.
3.3
HOW TO SHUT DOWN THE SYSTEM FOR
SHORT PERIODS
The system and boiler can be shut down for short
periods by simply turning the time clock to the off
position. It is also advisable to turn off the main
water supply to the house.
3.4
HOW TO SHUT DOWN THE SYSTEM FOR LONG
PERIODS
If the house is to be left unoccupied for any length
of time – especially during the winter – the system
should be thoroughly drained of all water. The gas,
water, and electricity supply to the house should
also be turned off. For more detailed advice
contact your installer.
3.5
HOW TO CARE FOR THE APPLIANCE
To clean the outer casing use only a clean damp
cloth. Do not use any scourers or abrasive
cleaners.
correct
pressure
value
