Resetting The Interlock After Switch-Off By The Safety Temperature Limiter (Stl); Status Codes; Diagnosis Codes - Vaillant atmocraft Installation And Maintenance Instructions Manual

9 Troubleshooting
9.2 Resetting the interlock after switch-off by the
safety temperature limiter (STL)
1
2
Fig. 9.1 Resetting the interlock after switch-off by the STL
If the fault code "F.20"is displayed, the safety
temperature limiter (STL) has automatically switched
the boiler off because the temperature is too high
Proceed as follows to reset it:
• Remove the front cover.
• Remove interlock on STL by pressing the pin (1).
• Reset the electronics by pushing the "Fault reset"
button (2).
Every time the STL responds you need to perform a
fault-finding exercise and remove the fault.
9.3

Status codes

The status codes that you can see on the display of the
DIA provide information about the current operating
condition of the appliance.
If several operating conditions arise at the same time,
the most important status code is always displayed.
The display of the status codes can be viewed as follows:
• Press the "i" button.
The display shows the status code, e.g. S.04 for
"Burner mode - Heating".
The display of the status codes can be ended 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.
38
Display Meaning
Displays during heating operation
S.00 No heat required
S.02 Heating pump supply
S.03 Heating ignition
S.04 Heating burner on
S.07 Heating pump run-out
S.08 Burner lock after heating mode
Displays during storage tank charging
Page 20 Storage cycle mode active
S.23 Storage tank charging ignition
S.24 Storage tank charging burner
S.27 Storage tank charging pump overrun
S.28 Burner blockage after storage tank charging
Displays of system conditions
S.30 No heat requirement controller from 2-point controller
S.31 Summer mode active
S.34 Heating frost protection active
S.36 No heat requirement controller from continuous
controller
S.39 Switch on terminal "Installation thermostat" has
interrupted
S.42 Exhaust gas diverter contact on accessories open
S.51 Unit has sensed exhaust gas escape and is within the
55 second tolerance time period
S.52 Unit is within the 20 minute waiting period because of
exhaust gas escape (atmospheric units)
Table 9.2 Status codes
9.4

Diagnosis codes

In the diagnosis mode, you can change certain
parameters or display more information see Table 9.3.
The parameters which can be changed are in bold type.
The setting of these parameters is also described in
Chapter 7.1.
• Press the "i" and "+" buttons simultaneously.
The display shows "d.00".
• Scroll to the desired diagnosis number with the "+" or
"–" buttons.
• Press the "i" button.
The display shows the relevant diagnosis information.
• If necessary, use the "+" or "–" buttons to change the
value (display flashes).
• Save the new value by holding down the "i" button for
approx. 5 seconds until the display no longer flashes.
You can end the diagnosis mode as follows:
• Press the "i" and "+"
buttons simultaneously or
• Do not press any button for about 4 minutes.
The current heating flow temperature appears in the
display again.
Installation and maintenance manual atmoCRAFT