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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Troubleshooting
Fault Display on the Programming Unit
(continued)
Warning messages
Messages on the display Meaning Measure
A.12 Real time clock battery flat. Replace the battery (type CR2032) in
the HMU heat management unit.
A.18 Possible condensate backup in the
heat cell
Check combustion chamber and
condensate drain.
Condensate may escape when removing
the burner door. Take appropriate
precautions to protect the electronic
components.
If condensate is backed up into the
combustion chamber, replace the
insulating ring, insulating block, flame
body, insulating mats and ionization
electrode. If the condensate has reached
the flame body assembly, also replace
the gasket of the flame body assembly.
A.19 Temperature limiter has responded
A.20 Service interval could not be activated. Check the time and date settings.
Information
Messages on the display Meaning
I.56 External demand active
I.57 External blocking active
I.59 Parameters were restored (parameter set was flashed to BCU electronics module).
Further messages
Service messages
Message on the display Meaning
P.1 Interval until the next service.
P.4 Top up heating water.
P.8 Service due after burner hours run.
Status messages
Message on the display Meaning
S.60 Summer mode active (outside temperature economy function)
S.74 Heating suppression, heating
S.75 DHW recirculation pump active
S154-1 Boiler internal flowswitch is in the open position
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