Vaillant ecoTEC plus 937 Service Manual download pdf (Page 58)

58 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

9 Troubleshooting

9.1 Logical fault finding procedure

Carry out the following checks before the actual trou-

bleshooting:

Carry out the tests to check electrical safety (see

Section "Preparatory Checks on the Electrical Sys-

tem").

Check that the external power supply for the combi

boiler is switched on and that there is a supply volt-

age of 230 V AC between the connections "L" and

"N".

Check that the gas supply to the combi boiler is

switched on.

Check that the combi boiler has been properly purged

and that there is a supply pressure of 20 mbar the

inlet to the boiler. (See Section "Gas Supply".)

Check that the heating system is filled with water and

that there is a pressure of between 1.0 and 1.5 mbar.

Otherwise top up the system and bleed. (See Section

"Filling and bleeding the Heating System".)

Check that the stop valves in the flow and return

lines of the combi boiler are open.

Check that the mains switch is set to "ON".

Set the temperature of the central heating to "Maxi-

mum".

Set the temperature of the hot water preparation to

"Maximum".

Check that all external controllers are switched on

and are demanding heat (if no external controllers

are fitted, the connections 3 and 4 on the combi

boiler terminal must be connected together).

Check that the burner anti-cycling time mode on the

combi boiler is not active.

9.1.1 Status codes

The status codes which you can see in the display pro-

vide information concerning the current operating sta-

tus of the unit.

Proceed as follows to display the status codes:

Fig. 9.1 Display of status codes

Press the "i" button.

The display shows the status code e.g. “S.04” for the

"Burner mode - heating".

The status code display can be de-activated as follows:

Press the "i" button or

Do not press any button for about 4 minutes.

The current heating flow temperature appears in the

display again.

9 Troubleshooting

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Vaillant ecoTEC plus 937 Service Manual Page 58

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