Viessmann Vitodens 242-F Operations Instructions download pdf (Page 87)

Fault code

on the dis-

play

System characteris-

tics

Cause Measures

59 No DHW heating Lead break, outlet

temperature sen-

sor

Check sensors (see

page 96)

92 No DHW heating Short circuit, col-

lector temperature

sensor; connection

to the solar control

module

Check sensor & on the

solar control module.

94 No DHW heating Short circuit, cylin-

der temperature

sensor; connection

to the solar control

module

Check sensor % on the

solar control module.

9A No DHW heating Lead break, collec-

tor temperature

sensor; connection

to the solar control

module

Check sensor & on the

solar control module.

9C No DHW heating Lead break, cylin-

der temperature

sensor; connection

to the solar control

module

Check sensor % on the

solar control module.

9E Control mode No flow rate in the

collector circuit or

flow rate too low, or

temperature limiter

has responded

Check solar circuit pump

and solar circuit. Acknowl-

edge fault message.

9F Control mode Solar control mod-

ule fault

Check solar control mod-

ule

A7 Control mode as per

delivered condition

Faulty program-

ming unit

Replace programming

unit

A8 Burner blocked The

venting program is

started automatically

(see page 61)

Air lock in the inter-

nal circulation

pump or minimum

flow rate not ach-

ieved

Vent the system if the fault

message continues to be

displayed

Troubleshooting

Fault codes

(cont.)

5418 193 GB

Service

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 143 144

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Viessmann Vitodens 242-F Operations Instructions Page 87

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