134
Fault mes-
sage
Cause Remedy Re-
set-
ting
"305: Eng
under cur-
rent"
Generator current < 0.25 A
(20 s after connecting to the
mains).
Check connecting cable be-
tween the control unit PCB
and the capacitor.
Check whether the circuit
breaker has tripped. Reset if
it has.
Remove both cables from the
capacitor and check the re-
sistance across the Stirling
generator. This must be at
least 4 Ω. Observe safety in-
structions on page 61.
If the fault recurs, notify
Viessmann Technical Serv-
ice.
SR
"306: Mains
failure start
fault "
Generator voltage < 150 V
(5 s after start pulse).
AR
"307: En-
gine stall"
Generator voltage < 50 V (if
generator running).
AR
"308: Stop
resistor in-
tegrity"
Stop resistor test failed. Check cables between the
control unit and the resis-
tors.
Check that the cables are
plugged in correctly. See
connection and wiring dia-
gram (plug X100) on
page 161.
Check resistors, replace if
necessary (see page 151).
AR
"309: Power
fail detec-
tion"
Software fault, mains failure
detection
Check electrical installation
on site.
If the fault recurs, check ca-
ble harnesses and plug-in
contacts in the control unit
and power supply unit.
AR
"310: Power
mon comm
fail"
Electricity meter communica-
tion fault
AR
"311: EGC
comm fail-
ure"
Communication fault If the fault recurs or persists,
replace the control unit PCB
(see page 138).
AR
Troubleshooting
Fault messages
(cont.)
5618 294 GB
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