0
I
xtra
MODE
STEP
STORE
RESET
+
A
B
C
D
E
F
G
H
I
im8219
MASTER MODULE
CONTROL PANEL
1 BOILER CONTROLS / DISPLAY (MASTER PANEL SHOWN)
In normal operation the display (C) shows the boiler status (see
table above) and the water system flow temperature.
Blocking Mode
The boiler will enter blocking mode under certain fault
conditions. Whilst in blocking mode the burner is switched off.
Once the fault conditions are clear the boiler will automatically
reset itself. In blocking mode the display will alternate between
showing a '9' in digit one, along with the flow temperature in
digits 2, 3 and 4, e.g.
Followed by the blocking code 'bxx', e.g.
Error Mode
In error mode the display will flash on and off with the error code
shown, e.g.
The boiler will enter error mode under certain fault conditions.
9 9 6
b 1 8
The unit will be inoperative until the fault is rectified. The reset
button is used to reset the boiler control module after an error
has occurred.
Self Check and Anti-Seize Modes
After switching on the mains power or after a reset, the boiler
performs a selfcheck, i.e. the DHW valve (if connected) is
energised first for 15 seconds then the CH pump is switched on
for a further 10 seconds. This cycle repeats itself every 24hrs,
as long as no heat request is given in 24hrs.
Burner on/off Switch
With the burner switch set to 'off' the boiler will not respond to a
CH demand. However, it will respond to a DHW demand and the
pump anti-seize and frost protection modes are still operational
any one of which could cause the boiler to fire. Note. The burner
switch is NOT a mains isolation switch.
CH/DHW Systems
In standby mode pressing and holding the '+' button for 3
seconds turns the CH system on/off.
In standby mode pressing and holding the '-' button for 3
seconds turns the DHW system on/off.
E 3 6
3
RESET
C
D
SLAVE MODULE
CONTROL PANEL
Sequence Boiler Status
A
DH
W valve energised
0
Standby, no heat request
1
Pre-purge, post purge
2
Ignition
3
Burner on in CH mode
4
Burner on in DHW mode
5
Waiting for air pressure switch to open or close
6
Burner off because a set value has been reached
7
Pump overrun in CH mode
8
Pump overrun in DHW mode
Operation
LEGEND
A.
Burner switch
B.
Pressure gauge
C.
Display
D.
Reset button
E.
Mode button
F.
Step button
G.
Store button
H.
+ button (to increase values)
I.
- button (to decrease values)
