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Commissioning
Preparation for operation
Display readout
Whilst the Boiler is in operation the
digital display (1) shows the flow
temperature of the Boiler whilst at the
same time LED (4) is illuminated.
By pressing SELECT button (7) the
following options are displayed in
succession:
LED (4) Flashing
– Display
shows Hot Water Temperature
No readout (Display shows -.-)
LED (5) Lit Shows operational
Status of Boiler
– LED‟s (4)
and (5) are off - Sequence
Status of the boiler shown as
follows:
0
Pause
1
No Heat Demand
2
Fan Ramp Up
3
Pre Purge
4
Changeover of Pre Purge to
ignition
5
Ignition
6
Flame Stabilisation / Rectification
10 Heating operation mode
11 Service water mode
20 Venting
22 Fan Run Down
99 Boiler Locked Out for
safety reasons
Locking code or information
relating to operating conditions of
heating appliance
Pressing Key (7) again will again
show the service water temperature
reading on the display. After a few
minutes the display returns to boiler
temperature.
Boiler Lock Out
If a malfunction occurs the Boiler will
Lock Out for safety reasons, the fault
is displayed by illumination of the LED
(3).
To restart the boiler: press RESET (6)
for approx 2 seconds. If the lock out
reoccurs, then check the gas supply to
the boiler, and/or the Flow / Return
Water isolation valves are open and
the boiler is above or below pressure
limitations.
If the lockout persists, contact MHS
Service department.
Use of flue cleaner key
The flue cleaner key (8) is only used
by a qualified specialist responsible
for maintenance, to undertake
calibration and carry out all checks
necessary for the correct operation of
the appliance. If the key is
inadvertently pressed, do not press
any other keys, but switch off the
appliance by means of adjusting knob
(10) and then switch on again.
