Operating instructions

ManualsBrandsViessmann ManualsBoilerWB2B

Fault

code

on the

display

Const. weath.-

comp.

System char-

acteristics

Cause Measures

FF X X Burner

blocked or in a

fault state

Internal fault

or "E

RESET" key

blocked

Start the equip-

ment again. Re-

place the control

unit, if the equip-

ment will not re-

start.

Repairs

Checking the outside temperature sensor (weather-compen-

sated control unit)

1. Pull plug "X3" from the control unit.

2. Test the resistance of the outside

temperature sensor across term-

inals "X3.1" and "X3.2" on the dis-

connected plug and compare it with

the curve.

Fault codes (cont.)

79

Troubleshooting

5692 672 GB