Viessmann B1HE-199 - Page 75

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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting
Displayed
fault code
System characteristics Cause Measures
F.182 No DHW heating Short circuit, outlet
temperature sensor
(if installed)
Check outlet temperature sensor (plug X1, cores 13 and
14). Measure sensor input on electronics module.
Target value: 3.3V– with sensor disconnected
F.183 No DHW heating Lead break, outlet
temperature sensor
(if installed)
Check outlet temperature sensor
(plug X1, cores 13 and 14).
F.184 Burner in a fault state Short circuit,
common supply
temperature sensor/
high limit safety
cutout
Check the supply temperature sensor/high limit safety
cut-out.
Check sensor lead. Replace faulty component if necessary.
Reset the boiler.
F.185 Burner in a fault state Lead break, common
supply temperature
sensor/high limit
safety cut-out
Check the supply temperature sensor/high limit safety
cut-out.
Replace faulty component if necessary.
Reset the boiler.
F.299 Time/date incorrect Real time clock
setting incorrect
Set the time and date.
F.342 No central heating,
no DHW heating
Communication error,
BCU burner control
unit
 Check connecting cable to the burner control unit
plug X4 on BCU.
 Check all plug-in connections and cables of the
internal CAN.
 Remove all plugs except X4, X2, X16 and X18 from
the BCU burner control unit. Check whether fault
persists.
Note: Several other fault messages will be added due to
the removed plugs. Ignore these. If fault message
F.342 is no longer shown, reinsert the plugs one by one
and establish which component is faulty.
Reset the boiler.
F.345 Burner locked out,
automatic enabling
after boiler cool down.
Independent restart.
Temperature limiter
has responded.
See boiler
specification.
 Ensure adequate heat transfer.
 Check heating system fill level.
 Check pre-charge pressure in diaphragm expansion
tank. Adjust to required system pressure.
 Check whether flow rate is sufficient
(flow sensor and pump).
 Check 3-way diverter valve function in actuator test.
Vent the system.
If the fault occurs during DHW heating:
Check DHW tank or plate heat exchanger for
contamination and scaling.