Repairs - Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors

Troubleshooting

Repairs

Replace control unit PCB
To reclaim fuel tax
Before replacing the control unit PCB,
calculate the gas used by the Stirling
burner since the last fixed day.
Calculating the gas used:
Subtract the "Amount of gas brought
in from fixed day 1" (code 9114 on the
fixed day date) from "Amount of gas
eng burner" (code 8345 in diagnostics
heat generation). Record the calculated
value in writing for claims purposes.
If subsidies have been applied for
The subsidy provider is entitled to
request proof of the amount of heat deliv-
ered for heating. Therefore, before
replacing the control unit PCB, calculate
the amount of heat delivered for heating
since the last fixed day.
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Calculating the amount of heat delivered
for heating:
Subtract the "Heat delivered heating
from fixed day 1" (code 9105 on the
fixed day date) from the"Heat delivered
heating" (code 8346 in diagnostics heat
generation). Record the calculated value
in writing.