Troubleshooting 8; Diagnostics; Status Codes - Vaillant ecoMAX 646 Installation And Maintenance Manual

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 always shown.
The display of the status codes can be viewed as follows:
• 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
Installation and maintenance manual ecoMAX 646
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 run-out
S. 7 Heating pump run-out
S. 8 Remaining lockout 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 run-out
S. 17 Hot water pump run-out
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 run-out
S. 27 Hot water pump run-out
S. 28 Hot water lockout time
S. 30 No heat requirement controller (2-point controller)
S. 31 Summer mode
S. 32 Waiting time fan
S. 34 Heating frost protection
S. 36 No heat requirement controller (continuous controller)
S. 37 Waiting time fan
S. 39 Feed thermostat contact open
S. 42 Flue gas flap no feedback
Waiting time lack of water (burner on T VL-RL was > 40 K;
S. 53
burner off T VL-RL was > 45 K
S. 54 Waiting time lack of water
Table 8.1 Status codes

Troubleshooting 8

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