Vaillant ecoTEC plus 837 Service Manual download pdf (Page 67)

Troubleshooting

Installation and maintenance instructions ecoTEC plus 0020116700_06 67

Display Meaning

S.62 Gas family check unsuccessful: CO/CO

values at limit.

Check combustion.

S.63 Gas family check unsuccessful: Combustion quality out-

side permissible range (see also F.93).

S.76 System pressure too low; top up water

S.96 Return temperature sensor test running, heating

demands are blocked

S.97 Water pressure sensor test running, heating demands

are blocked

S.98 Flow/return temperature sensor test running, heating

demands are blocked

13.1 Status codes (continuation)

13.2.3 Service messages

If the "open-end spanner" maintenance symbol appears

on the display, a service message is present. The mainte-

nance symbol appears if you have set a maintenance inter-

val, for example, (¬section11.1.6) and it has elapsed. The

boiler is not in fault mode but continues to operate.

To obtain more information about the service message:

> Call up the "Live Monitor" (¬section13.2.1).

If status code S.40 is displayed as well as the maintenance

symbol, the boiler is in comfort protection mode. This

means that the boiler continues to operate with restricted

comfort after it has detected a fault (e.g. because of a

severe storm).

> In this case, read out the fault memory in order to deter-

mine whether a boiler component is defective

(¬section13.2.5).

If no fault message is present, the boiler will automatically

switch back to normal operation after a certain time. Com-

fort safety mode may then have been triggered by a severe

storm, for example.

13.2.4 Calling up diagnosis levels

Menu ¬ Installer level ¬ Diagnosis menu

You can use the diagnosis menu to inspect parameters and

modify certain parameters. An overview of the diagnosis

codes can be found in ¬table11.1.

13.2.5 Reading off the fault codes

If a fault develops in the boiler, the display shows a fault

code F.xx.

A plain text display explains the displayed fault code.

Example F.10: "Flow temperature sensor short circuit".

Fault codes have priority over all other displays. If a fault

occurs, the display no longer shows the current heating

flow temperature of the heating installation.

If multiple faults occur at the same time, the display shows

the corresponding fault codes for two seconds each in

sequence.

> Remedy the fault.

> To restart the boiler, press the reset button (¬Operating

instructions).

> If you are unable to remedy the fault and the fault reoc-

curs despite having carried out several resets, contact

Vaillant customer service Vaillant Service Solutions

(0870 6060 777).

13.2.6 Querying the fault memory

Menu ¬ Installer level ¬ Fault list

The boiler has a fault memory.

Here you can query the last ten faults that occurred in

chronological order.

The display shows:

– the number of faults that have occurred

– the fault currently selected with fault number F.xx.

– a plain text display explaining the fault

> You can display the last 10 faults that occurred using the

minus button

or the plus button .

13.2.7 Reset fault memory

You can delete the entire fault list.

> Press the right selection button

(“Delete”).

> Confirm the deletion of the fault memory by pressing the

right selection button again

(“OK”).

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Vaillant ecoTEC plus 837 Service Manual Page 67

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