Installation and maintenance instructions ecoTEC 0020029172_03
48
Code
Meaning
Cause
F.74
Failure Water pressure sensor signal outside correct
range (too high)
Line to water pressure sensor has short-circuited at 5V/24V
or internal failure in water pressure sensor
F.75
Failure Pump/water lack
Water pressure sensor and/or pump defective, air in heating
installation, too little water in boiler; check adjustable bypass,
connect external expansion vessel to return
F.77
Failure Flue gas damper/condensate pump
condensate pump defective, cable connection; no checkback signal
from flue gas damper (bridge) of "2 in 7" multifunctional module,
flue gas damper has triggered
con
No communication with the electronics
Communication failure between display and PCB in the electronic
box
Table 9.4 Fault messages (continued)
9.2
Check programs
Special functions can be triggered in the boilers by
activating various check programs.
These programs are given in detail in Table 9.5.
The check programs P.0 to P.6 are started as follows:
• Push the "+" button and hold it down.
• Push the "Fault clearance key" once or switch the
main switch off and on again.
After approximately 5 seconds, P.0 appears in the
display. You can now release the "+" button.
• Push the "+" key to start counting the check
programme number upwards.
• Push the "i“ to operate the boiler now and to start the
check programme.
• Push "i“ and "+“ simultaneously to exit the check
programs. You can also exit the check programs by
not pushing any button for 15 minutes.
Display
Meaning
P. 0
1)
Check Program Dearation
The heating circuit and the hot water circuit are bled
via the automatic air vent (the cap of the automatic air
vent must be released).
1 x "i" button: Start bleeding heating circuit
(display view: HP)
2 x "i" button: Start bleeding charging circuit
(display view: SP)
3 x "i" button: Exit bleeding program
The heating pump is cyclically actuated.
Note:
The check program deaeration takes about 6.5
minutes to complete.
P.1
Check Program Max. Load:
The boiler is operated at full load after successful
ignition.
P.2
Check Program Min. Load:
The boiler is operated at minimum load after
successful ignition.
P.5
Check Program Safety Overheat Cut-Off:
The burner is switched on at maximum output and the
temperature control is switched off so that the boiler
produces heat, bypassing a regular shutdown, until the
shutdown temperature of the safety thermostat is
reached (97 °C).
P.6
Check Program Diverter Valve Middle Position:
(not active)
Table 9.5 Check programs
1)
Bleeding the boiler circuit:
Actuation of heating pump for 15 cycles: 15 s on, 10 s off.
Display view: HP or SP.
9.3
Resetting parameters to factory settings
In addition to the option of manually resetting the
factory settings for the individual parameters specified
in Tables 9.2 and 9.3, you can also reset all parameters
simultaneously.
• Change the value at diagnosis point "d.96“ in
diagnosis level 2 to 1 (see Chapter 9.1.2).
The parameters of all adjustable diagnosis points now
correspond to the factory settings.
9 Troubleshooting
Summary of Contents for ecoTEC VU 466/4
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