Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 134

Troubleshooting
Fault messages on the gas condensing...
Control unit System characteristics
message
F.524/18F1 No power generation
F.527 Burner locked out
F.528 Burner locked out
F.540 Burner in a fault state
F.542 Mixer closes. Heating circuit
pump is operational.
F.543 Mixer closes. Heating circuit
pump is operational.
F.544 Mixer closes. Heating circuit
pump is operational.
F.545 Mixer closes. Heating circuit
pump is operational.
F.546 Mixer closes. Heating circuit
pump is operational.
F.547 Mixer closes. Heating circuit
pump is operational.
F.548 Mixer closes. Heating circuit
pump is operational.
F.549 Mixer closes. Heating circuit
pump is operational.
Note
If subscriber faults occur, "Error, subscriber ..." is dis-
played.
134
(cont.)
Cause
Fault, reformer burner ig-
nition
Update parameters faulty
or incomplete
Basic programming faulty
or incomplete
Condensation water accu-
mulation in the heat cell
Lead break, flow tempera-
ture sensor, heating circuit
1 with mixer
Short circuit, flow temper-
ature sensor 1 in heating
circuit with mixer
Lead break, flow tempera-
ture sensor, heating circuit
2 with mixer
Short circuit, flow temper-
ature sensor 2 in heating
circuit with mixer
Lead break, flow tempera-
ture sensor, heating circuit
3 with mixer
Short circuit, flow temper-
ature sensor 3 in heating
circuit with mixer
Lead break, flow tempera-
ture sensor, heating circuit
4 with mixer
Short circuit, flow temper-
ature sensor 4 in heating
circuit with mixer
Measures
Reset the fault once.
If the fault recurs, notify Viessmann
Technical Service.
Repeat burner control unit flash
operation.
Repeat burner control unit flash
operation.
Check if condensate banked.
Check condensate drain and trap.
Note
To prevent water damage, detach
fan unit before removing the burn-
er.
Reset device.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.
Check flow temperature sensor
TS1 on extension kit mixer (elec-
tronics module ADIO). See
page 140.