Vaillant ecoMAX 635, Instructions For Installation And Servicing

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8 Troubleshooting
Instructions for installation and servicing ecoMAX
32
8 Troubleshooting
8.1 Logical fault finding procedure
These checks must be carried out before attempting to
use the fault finding guide.
1. Carry out electrical safety checks (See Section
‘Preliminary Electrical Checks’).
2.Check that the external electricity supply to the boiler
is on, and a supply of 230 V~ is present between boiler
terminals ‘L’ and ‘N’.
3. Check that the gas supply to the boiler is on, that it
has been correctly purged and that an inlet pressure
of 20 mbar is available at the gas valve. (See Section
‘Gas Supply’).
4.Ensure the heating system is full of water and charged
to between 1 and 1.5 bar. If not, refill and vent the
system. (See Section ‘Filling the heating system’).
Ensure boiler flow and return service valves are open.
5.Check that the main on/off control is set to the ‘on’
position.
6.Set the central heating temperature to maximum.
7. Check that all external controls are on and calling for
heat (if, no external controls are fitted, boiler termi-
nals 3 and 4 must be linked). Check that the boiler
anti–cycling economiser is not engaged.
Fig. 8.1 Displaying of status codes
8.1.1 Status mode
The status mode provides information about the current
operating status of the boiler.
To display status mode proceed as follows:
• Press the ”i” button below the display, and a status
code will appear in the display indicating the current
operational status of the boiler (see table 8.1).
To cancel the status code mode proceed as follows:
• Press the ”i” button below the display or
• Do not press any key for approximately four minutes.
The display will now revert back to showing the cur-
rent flow temperature.
Key to status codes
Code Meaning ecoMAX 635
S.0 No heat demand
(heating operation) X
S.1 Pump running
(heating operation) X
S.2 Pump running – pre ignition
(heating operation) X
S.3 Ignition sequence
(heating operation) X
S.4 Burner ignited
(heating operation) X
S.5 –
S.6 Heating system fan over run X
S.7 Pump over run
(heating operation) X
S.8 Anti cycling mode
(heating operation) X
S.30 No heating demand from
external controls X
S.32 Fan unit waiting period X
S.34 Frost protection mode X
S.36 No heating demand from
low voltage controls X
S.37 Fan unit waiting period X
S.39 Contact thermostat has been
activated (under floor systems) X
S.53 Delay mode due to lack
of water in system (~20 mins.) X
S.54 Low water–level waiting period X
Table 8.1 Status codes
8.1.2 Diagnosis modes
In order to assist with the pinpointing of a particular
fault it is possible to use the boiler display in a diagno-
stic mode to interrogate the boiler about the status of
certain components (Table 8.2).
• Press the ”i” and ”+” buttons below the display simul-
taneously. The display will now show ”d.0”.
• Use ”+” or ”–” buttons to scroll up or down to the desi-
red diagnosic number.
• Press ”i” button to display the corresponding diagno-
sic information.
• If necessary, you can now alter the value by pressing
”+” or ”–” buttons. (When altering values display will
flash). Press and hold the ”i” button to save the value
to memory, when the value is saved the display will
stop flashing.
Diagnosic mode is cancelled as follows:
• Press the ”i” and ”+” buttons simultaneously or
• Do not press any key for approximately four minutes.
The display will now revert back to showing the cur-
rent flow temperature.
80020014605_00GB_032006 22.02.2006 21:36 Uhr Seite 32