Viessmann Vitopend 100-W

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Displayed

fault code

System character-

istics

Cause Measures

F80 Function at the ex-

ternal extension faul-

Short circuit, lower

cylinder tempera-

ture sensor S2 at

the external exten-

sion

Check sensor.

Installation and

service instruc-

tions for external

extension

F88 Function at the ex-

ternal extension faul-

Lead break, lower

cylinder tempera-

ture sensor S2 at

the external exten-

sion

Check sensor.

Installation and

service instruc-

tions for external

extension

F90 Function at the ex-

ternal extension faul-

Short circuit, upper

cylinder tempera-

ture sensor S3 at

the external exten-

sion

Checking the sensor

Installation and

service instruc-

tions for external

extension

F98 Function at the ex-

ternal extension faul-

Lead break, upper

cylinder tempera-

ture sensor S3 at

the external exten-

sion

Check sensor.

Installation and

service instruc-

tions for external

extension

FA9 Function of Open-

Therm control unit

faulty

OpenTherm com-

munication inter-

rupted

Check OpenTherm con-

necting lead. Check set-

ting of parameter P07.

Troubleshooting

Fault display

(cont.)

5837146

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