8
4 Operation
Instructions for use ecoMAX8
4.4.2 Setting the external controls
Fig. B.9 Setting the external controls
• Set the room thermostat and/or the thermostatic
radiator valves according to the instructions supplied
with the control(s).
Note!
Vaillant offer room thermostat/time control
accessories which give accurate and economic
room temperature control as well as improved
comfort.
Ask your installer!
The boiler will now operate automatically to provide cen-
tral heating for the conditions selected on the external
controls (ecoMAX 800 series will also provide domestic
hot water on demand).
Whilst the boiler is operating, the boiler display indicates
the temperature of the water within the boiler circuit.
After the boiler stops operating the pump and fan will
continue to operate for a short period to fully disperse
the heat from the boiler.
Note!
The boiler incorporates an anti-cycling economi-
ser control to prevent energy wasteful ON and
OFF operation of the boiler for short periods
when in the central heating mode. When turning
the room thermostat to a higher setting there
may therefore be a short delay before the boiler
operates.
4.5 Status displays (Fig. B.10)
(for maintenance and servicing work carried out
by a qualified service engineer)
Fig. B.10 Status displays
• The status displays are activated by pressing the "i" (1)
button.
The display (2) now shows the corresponding status
code, e.g. "S.4" for burner operation. Please refer to
table B.1 (below) for details of the most important status
codes.
• Press the "i" button again to return to normal mode.
During changeover phases, such as when the system
restarts after the flame has been extinguished, the "S"
status message is displayed briefly.
Display Meaning
S. 0* No heat requirement
S. 1* Pump running
S. 3* Heating system ignition
S. 4* Burner ignited
S. 5* Fan and pump overrun
S. 7* Pump over run
S. 8* Anti cycling mode (after heating operation)
S. 10** Hot-water demand
S. 14** Burner ignited
S. 34* Frost protection mode
Table B.1: Status displays (a complete list of status codes can
be found in the installation and maintenance
instructions)
* Heating mode
** Hot-water mode (ecoMAX 800 series only)
