Test Programs; Resetting Parameter To Factory Settings - Vaillant ecoTEC exclusive 832 Installation And Maintenance Instructions Manual

9 Troubleshooting
Code Meaning
F.71 Constant value feed NTC
F.72 Flow and/or return sensor fault
Signal water pressure sensor in the wrong range
F.73
(too low)
Signal water pressure sensor in the wrong range
F.74
(too high)
No sudden change in pressure was detected on
F.75
turning on the pump
F.76 Interruption in cable harness
Condensate pump or return signal from accessory
F.77
module heating
con No communication with the printed circuit board
Table 9.4 Error codes (continuation)
9.2

Test programs

Special functions can be triggered in the appliances by
activating various test programs.
These programs are given in detail in the Table 9.5.
• The test programmes P.0 to P.6 will be started when
"Power ON" is turned on and the "+" button is
pressed for 5 seconds simultaneously. The display
shows "P.0".
• Press the "+" key to start counting the test pro-
gramme number upwards.
• Press the "i" to operate the appliance now and to
start the test programme.
• Press "i" and "+" simultaneously to exit the test pro-
grams. You can also exit the test programs by not
pressing any button for 15 minutes.
Display Meaning
Bleeding test program The heating circuit and
the hot water circuit are bled via the automatic
P.0
bleeding valve (the cap of the automatic bleeding
valve must be released).
Test programme where the appliance is operated
P.1
in full load after successful ignition.
Test program where the appliance is operated with
P.2 minimum gas volume (ignition gas volume) after
successful ignition.
Test function for the safety temperature limiter (STL):
The burner is switched on with maximum output,
P.5 the temperature controller is switched off so that the
burner heats until the software STL responds by reach-
ing the STL temperature on the flow or return sensor.
Filling/draining programme:
P.6 The preference changeover valve moves to the centre
position. The burners and pump are switched off.
Table 9.5 Test programmes
44
Cause
Feed NTC faulty
Flow and/or return sensor is faulty (tolerance too great)
Line to water pressure sensor is interrupted or has
a short-circuit to 0V or water pressure sensor faulty
Line to water pressure sensor has a short-circuit at 5V / 24V
or internal fault in water pressure sensor
Water pressure sensor or/and pump defective
Too little water in the appliance; check adjustable bypass;
Connect expansion vessel in return;
Air in the appliance
Cable harness faulty
Condensate pump faulty or return signal from the exhaust
gas flap has responded
Communication fault between the display and the printed
circuit board in the switchgear box
9.3

Resetting parameter to factory settings

Besides the option to reset individual parameters manu-
ally to the factory settings specified in Tables 9.2 and 9.3,
you can also reset all parameters simultaneously.
• Change the value in the 2nd diagnosis level under di-
agnosis point "d.96" to 1 (see Section 9.1.2).
The parameters of all adjustable diagnosis points now
correspond to the factory settings.
ecoTEC exclusive installation and maintenance instructions / 0020017768_04