Viessmann Vitodens 242-F Operations Instructions download pdf (Page 86)

86

Fault code

on the dis-

play

System characteris-

tics

Cause Measures

10 Controls as if the out-

side temperature

were 0 °C

Short circuit, out-

side temperature

sensor

Check the outside tem-

perature sensor (see

page 95)

18 Controls as if the out-

side temperature

were 0 °C

Lead break, out-

side temperature

sensor

Check the outside tem-

perature sensor (see

page 95)

20 Regulates without

flow temperature

sensor (low loss

header)

Short circuit, sys-

tem flow tempera-

ture sensor

Check the low loss header

sensor (see page 96)

28 Regulates without

flow temperature

sensor (low loss

header)

Lead break, sys-

tem flow tempera-

ture sensor

Check the low loss header

sensor (see page 96)

30 Burner blocked Short circuit, boiler

water temperature

sensor

Check the boiler water

temperature sensor (see

page 96)

38 Burner blocked Lead break, boiler

water temperature

sensor

Check the boiler water

temperature sensor (see

page 96)

40 Mixer closes Short circuit, flow

temperature sen-

sor, heating circuit

2 (with mixer)

Check flow temperature

sensor

48 Mixer closes Lead break, flow

temperature sen-

sor, heating circuit

2 (with mixer)

Check flow temperature

sensor

50 No DHW heating Short circuit, cylin-

der temperature

sensor

Check sensors (see

page 96)

51 No DHW heating Short circuit, outlet

temperature sen-

sor

Check sensors (see

page 96)

58 No DHW heating Lead break, cylin-

der temperature

sensor

Check sensors (see

page 96)

Troubleshooting

Fault codes

5418 193 GB

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 143 144

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