Viessmann C3TB, Инструкции по установке и обслуживанию для подрядчиков

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117
Fault code dis-
played System characteristics Cause Measures
7F Circulation pump for dis-
charging buffer stopped Lead break on top buffer
temperature sensor
)
A
Check top buffer temperature sen-
sor (see page 130).
80 Circulation pump for dis-
charging buffer stopped Short circuit on bottom
buffer temperature sen-
sor
)
B
Check bottom buffer temperature
sensor (see page 130).
81 Circulation pump for dis-
charging buffer stopped Lead break on bottom buf-
fer temperature sen-
sor
)
B
Check bottom buffer temperature
sensor (see page 130).
A2 Emergency mode with insuffi-
cient system pressure System pressure too low Top up with water.
A3 Burner blocked Flue gas temperature sen-
sor incorrectly positioned Fit flue gas temperature sensor
correctly (see page 131).
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 the programming unit.
A8 Burner blocked. Venting pro-
gram starts automatically. Air in the internal circula-
tion pump or minimum
flow rate not achieved Vent the system if the fault mes-
sage persists.
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 circulation pump.
b0 Burner blocked Short circuit, flue gas tem-
perature sensor Check the flue gas temperature
sensor (see page 131).
b1 Control mode as per deliv-
ered condition Communication error, pro-
gramming unit Check connections; replace pro-
gramming unit if necessary.
b4 Regulates as if the outside
temperature were 0 °C. Internal fault Replace control unit.
b5 Control mode as per deliv-
ered condition Internal fault Replace control unit.
b7 Burner blocked Coding card fault Plug in or replace the coding card.
b8 Burner blocked Lead break, flue gas tem-
perature sensor Check the flue gas temperature
sensor (see page 131).
bA Mixer regulates to 20 °C flow
temperature. Communication error, mix-
er extension kit for heating
circuit 2 (with mixer) Check mixer extension kit connec-
tions and code.
bb Mixer regulates to 20 °C flow
temperature. Communication error, mix-
er extension kit for heating
circuit 3 (with mixer) Check mixer extension kit connec-
tions and code.
Troubleshooting
Fault codes for gas condensing module
(cont.)
5775 636 GB
Diagnosis