Viessmann 7513244, Инструкция по установке и обслуживанию

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95
Fault code dis-
played System characteristics Cause Measures
9E Control mode No flow rate in solar circuit
or flow rate too low, or
temperature limiter has
triggered. Check solar circuit.
Acknowledge fault message (see
separate installation and service
instructions).
9F Control mode Solar control module fault Replace solar control module
A2 Emergency mode with insuffi-
cient system pressure System pressure too low Top up with water
A4 Control mode Max. system pressure ex-
ceeded Check the system pressure.
Check the function and sizing of
the expansion vessel.
Vent the heating system.
Coding address "0E" is set to "1" to
document the fault. Must be man-
ually reset to "0" after troubleshoot-
ing.
A7 Control mode as per deliv-
ered condition Programming unit faulty Replace programming unit
A8 Burner blocked. The venting
program is started automati-
cally (see page 68) Air in the internal circula-
tion pump or minimum
flow rate not achieved Vent the system if the fault mes-
sage continues to be displayed
A9 If a heating circuit with mixer
is connected, the burner op-
erates at its lower heating
output.
If only one heating circuit
without mixer is connected,
the burner is blocked. Internal circulation pump
blocked Check the circulation pump
b0 Burner blocked Short circuit, flue gas tem-
perature sensor Check the flue gas temperature
sensor
b1 Control mode as per deliv-
ered condition Communication error, pro-
gramming unit Check connections and replace
programming unit if required
b4 Regulates as if the outside
temperature were 0 °C Internal fault Replace the control unit
b5 Control mode as per deliv-
ered condition Internal fault Replace the control unit
b7 Burner blocked Fault, boiler coding card Plug in or replace boiler coding
card
b8 Burner blocked Lead break, flue gas tem-
perature sensor Check the flue gas temperature
sensor
bA Mixer regulates to 20 °C flow
temperature. Communication error, ex-
tension kit for heating cir-
cuit 2 (with mixer) Check the extension kit connec-
tions and coding
bb Mixer regulates to 20 °C flow
temperature. Communication error, ex-
tension kit for heating cir-
cuit 3 (with mixer) Check the extension kit connec-
tions and coding
bC Control mode without remote
control Communication error,
Vitotrol remote control,
heating circuit 1 (without
mixer) Check connections, cable and cod-
ing address "A0" in group
"Heat-
ing circuit" , and check remote
control configuration (see
page 123).
For wireless remote controls:
Check connection, place remote
control unit close to the boiler.
Troubleshooting
Fault codes
(cont.)
5773 238 GB
Diagnosis