Water pressure sensor signal out of
range (too low)
Spare part failure display and main
board interchanged at same time and
device specific number not adjusted
No pressure rise was detected on
turning on the pump
Water pressure sensor or/and pump
defective Air in the heating system,
quick bleeder defective Too little water
in appliance; check adjustable by-pass;
connect external expansion vessel to
return
Overheating protection on primary heat
exchanger triggered
Cable or cable connection of fuse in the
primary heat exchanger defective, or
primary heat exchanger defective
Condensate pump or feedback of
accessories blocks heating
Condensate pump defective or flume
flap feedback triggered
Wrong configuration with accessory
link box VR65 connected to combination
boiler
No communication to main board
Connection error display main board
10.2 Test programs
Special functions can be triggered on the appliances by activating various test programs.
These programs are given in detail in the table 10.5.
● The test programs P.0 to P.6 will be started when “Power ON” is turned on and the “+”
key is pressed for 5 s. The display shows “P.0”.
● Press the “+” key to start counting the test number upwards.
● Press the “i” to operate the appliance now and to start the test program.
● Press “i” and “+” simultaneously to exit the test programs. You can also exit the test
programs by not pressing any key for 15 minutes.
NOTE:
If the power switch is out of reach, alternatively press the reset button then hold the "+"
key until "P0" is displayed.
Table 10.5 Test programs
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