Troubleshooting; Diagnostics; Status Codes - Vaillant ecoMAX 665 Installation And Maintenance Manual

8 Troubleshooting

8 Troubleshooting
8.1

Diagnostics

8.1.1

Status codes

The status codes, which you get via the DIA system's
display, give you information about the appliance's cur-
rent operating status. If several operating statuses exist
simultaneously, the most important status code is al-
ways shown.
The display of the status codes can be viewed as fol-
lows:
• Press the "i" key beneath the display.
The status code appears in the display, e.g. S.04 for
"Burner mode - heating".
The display of the status codes can be ended as follows:
• Press the "i" key beneath the display
or
• do not press any key for about 4 minutes. The current
heating supply temperature appears in the display
again.
Fig. 8.1 Display of status codes
32
Code Meaning
S.0 No heat required
S.1 Heating pump supply
S.2 Heating fan start
S.3 Heating ignition
S.4 Heating burner on
S.5 -
S.6 Heating fan over-run
S.7 Heating pump over-run
S.8 Remaining anti-cycle time heating
S.10 Hot water request
S.11 Hot water fan start
S.13 Hot water ignition
S.14 Hot water burner on
S.15 –
S.16 Hot water fan over-run
S.17 Hot water pump over-run
S.20 Hot water cycle mode
S.21 Hot water fan start
S.23 Hot water ignition
S.24 Hot water burner on
S.25 –
S.26 Hot water fan over-run
S.27 Hot water pump over-run
S.28 Hot water anti-cycle time
S.30 No heat requirement controller (2-point controller)
No heat demand from external controls or
S.31
CH dial off
S.32 Waiting time fan
S.34 Heating frost protection
S.36 No heat requirement controller (Vaillant controller)
S.42 Flue gas flap no feedback
S.37 Waiting time fan
S.39 Safety circuit (contact-therm) external device failure
Waiting time lack of water (burner on
S.53
> 30 K; burner off T Fl.-Ret. was > 35 K
S.54 No water pressure in boiler
Table 8.1: Status codes
Installation and maintenance manual ecoMAX 665 / 0020020159_03
T Fl.-Ret. was