Vaillant ecoCRAFT VKK GB SERIES Installation And Maintenance Instructions Manual - page 36
Installation and maintenance instructions ecoCRAFT - 0020055744_03
36
8.11
Checking the safety temperature limiter
1
Fig. 8.9 Reset button
Key
1 STL reset button with cover cap
• Switch on the mains switch.
• Turn the heating circuit off.
• Set the unit to maximum feed temperature and heat
the unit up to switch-off by the controller.
• After waiting for two minutes (temperature equalisa-
tion) start test program "P.5".
As a result of starting test program "P.5", the boiler re-
mains in operation until the safety temperature limiter
responds.
The test program "P.5" is called up by switching
"Mains on" whilst simultaneously holding the "+" button
down for 5 seconds. By pressing the "Info" button the
test program is started and the boiler is started for the
STL test.
h
Note!
The internal heating pump is not switched off
for control technological reasons. The isolation
units in the heating circuits should therefore
remain closed during the STL test.
The boiler must switch off at 110 ºC.
• Reset the safety temperature limiter after the boiler
(see Section 9.4) has cooled down.
h
Note!
The test programme is automatically exited
after 15 minutes. The test must be performed
within this time period.
8.12 Functional
check
After completion of all inspection and maintenance
work, always carry out a function check as described in
Section 6.6.
9 Troubleshooting
9.1 Status
messages
• Press the "i" button to read the current operating status.
• Press the "i" button again to quit the display mode.
All the parameters are summarised in the following table.
Display
Status messages
Heating mode
S.00
No heat required
S.02
Water pump pre-run
S.03
Ignition
S.04
Burner mode
S.06
Fan overrun
S.07
Water pump overrun
S.08
Burner lockout after heating operation
Cylinder charging/Warm start
S.20
Water pump pre-run
S.23
Ignition
S.24
Burner mode
S.26
Fan overrun after cylinder charging
S.27
Water pump overrun
S.28
Burner lock after recharging (cycle suppression)
Special cases of status message
S.30
230V/24V room thermostat is blocking heating operation
S.31
Summer mode active or eBus controller/built-in timer
is blocking heating operation
S.32
Fan speed wait time (speed deviation still too great)
S.33
Pressure cartridge wait time (pressure cartridge
contact still has not closed)
S.34
Frost protection mode active
S.35
Speed ramp wait time (speed deviation during ramp-up)
S.36
Target value specification of analogue regulator < 20
°C , i.e. the external regulator is blocking the heating
operation
S.39
Contact thermostat has responded
S.40
Indicate emergency operation active; Unit runs in
restricted Vaillant assured comfort mode.
Corresponding error code alternates with status
message in display
S.41
System pressure too high on water side
S.42
- Flue non-return valve feedback is blocking burner
mode (only in connection with accessory)
- Condensate pump faulty -> demand is blocked
S.49
Siphon pressure cartridge has triggered, wait time
S.53
Appliance is within the waiting period of the operation
blocking function as a result of low water pressure
(flow-return difference too great)
S.54
Appliance is within the waiting period of the operation
blocking function as a result of low water pressure
(temperature gradient)
S.96
Return sensor test running, heating demands are blocked
S.97
Water pressure sensor test running, heating requests
are blocked
S.98
Flow and return sensor test in progress, heating
requests are blocked
Table 9.1 Status messages
8 Maintenance
9 Troubleshooting