Viessmann VITOTRONIC 300-K Operations Instructions download pdf (Page 75)

5693 976 - 04

Vitotronic 200 and 300-K Installation and Service

Troubleshooting

Fault Display Vitotronic 300-K (continued)

Fault codes

Displayed fault code System characteristics Cause Measures

94 No solar DHW heating. Short circuit, DHW tank

temperature sensor, connection

of temperature sensor % at

solar control module or sensor

at S2 of the Vitosolic.

Check sensor at the solar

control unit (see separate

installation and service

instructions).

98 Control mode. Lead break, temperature sensor

/, connection to solar control

module.

Check temperature sensor /

(see separate installation and

service instructions).

Check coding address 20

in “Solar” group.

99 Control mode. Lead break, temperature sensor

aÖ, connection to solar control

module.

Check temperature sensor aÖ

(see separate installation and

service instructions).

Check coding address 20

in “Solar” group.

9A No solar DHW heating. Lead break, collector

temperature sensor, connection,

temperature sensor & at solar

control module or sensor at S1

of the Vitosolic.

Check sensor at the solar

control unit (see separate

installation and service

instructions).

9B Control mode. Lead break, temperature

sensor, connection at S3 of the

Vitosolic.

Check sensor at the solar

control unit (see separate

installation and service

instructions).

9C No solar DHW heating. Lead break, DHW tank

temperature sensor, connection

of temperature sensor % at

solar control module or sensor

at S2 of the Vitosolic.

Check sensor at the solar

control unit (see separate

installation and service

instructions).

9E Control mode. No flow rate in solar circuit

or flow rate too low, or

temperature limiter has

responded.

Check solar circuit.

Acknowledge fault message

(see separate installation and

service instructions).

9F Control mode. Solar control module

or Vitosolic faulty.

Displayed if a fault occurs at

these devices that has no fault

code in the Vitotronic.

Check solar control unit (see

separate installation and service

instructions).

AB Control operation, DHW

tank may be cold.

Primary store system

configuration error:

Code “55:3” has been selected,

but plug aJB is not plugged

in and/or Codes “4C:1” and

“4E:2” have not been set.

Insert plug aJB and check

coding.

B1 Control mode. Communication error,

programming unit

Check connections and replace

the programming unit if

required.

B5 Control mode. Internal fault Check correct insertion

of PCB (see parts list).

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Viessmann VITOTRONIC 300-K Operations Instructions Page 75

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