Viessmann B1HE-199 - Fault Messages

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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Troubleshooting
Fault Messages
Note: For diagnostics and troubleshooting, see chapter
“Repairs”.
Fault messages dependent on boiler equipment
level
Displayed
fault code
System characteristics Cause Measures
F.5 System continues op-
erating in normal mode
with replacement value.
Lead break or short
circuit
Check plug 33/X6 and cable:
 Check voltage level, to see if 5V present at plug 33,
pin 1 and 2.
 Turn the gas condensing system boiler ON/OFF switch
off and back on again.
F.7 No DHW heating Lead break, storage
tank temperature
sensor
 Check DHW setting in the commissioning
assistant and correct if necessary.
 Check storage tank temperature sensor (plug 5,
wires 3 and 4).
 Measure voltage at sensor input on electronics
module. Target value: 3.3V– with sensor disconnected.
Replace faulty component if necessary.
F.8 No DHW heating Short circuit, storage
tank temperature
sensor
Check storage tank temperature sensor (plug 5, wires
3 and 4).
Replace faulty component if necessary.
F.13 Regulates as if the out-
side temperature were
32°F (0°C).
Lead break, outside
temperature sensor
 Check the operating mode setting in the
commissioning assistant and correct if necessary.
 Check outside temperature sensor and connection to
sensor (external plug, contacts 1 and 2).
 Measure voltage at sensor input on electronics module.
Target value: 3.3V– with sensor disconnected.
Replace faulty component if necessary.
F.14 Regulates as if the out-
side temperature were
32°F (0°C).
Short circuit, out-
side temperature
sensor
Check outside temperature sensor and connection to
sensor (external plug, and contacts 1 and 2).
Replace faulty components if necessary.
F.49 Burner in a fault state Flue gas temperature
sensor disconnection
Check flue gas temperature sensor.
Reset the boiler.
F.50 Burner in a fault state Short circuit, flue gas
temperature sensor
Check flue gas temperature sensor.
Reset the boiler.
F.59 Burner locked out Power supply, low
voltage
Check mains voltage.
If voltage is correct and the fault occurs repeatedly,
replace the fan unit.