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Fault messages
(cont.)
Cause
Temperature sensor 2 lead break
7E Lead break sensor 3 pump module
Control with 150 °C actual boiler water temperature for
function 2 (parameter "03:2") or function 6 (parameter
"03:6")
Cause
Temperature sensor 3 lead break
7F Lead break sensor 4 pump module
Control with 0 °C actual buffer temperature for function
5 (parameter "03:5") or function 6 (parameter "03:6")
Cause
Temperature sensor 4 lead break
A5 Fault message at pump module digital input
Control mode
Cause
Pump module digital input DE1 reports a fault.
A6 Internal pump module error
No circulation pump speed control
Cause
Internal pump module error
C4 Pump module comm error
Emergency mode with max. possible speed
Cause
Pump module comm error
Diagnosis and fault messages
Measure
Check temperature sensor: See chapter "Checking the
temperature sensors".
Replace temperature sensor if necessary.
Measure
Check temperature sensor: See chapter "Checking the
temperature sensors".
Replace temperature sensor if necessary.
Measure
Check temperature sensor: See chapter "Checking the
temperature sensors".
Replace temperature sensor if necessary.
Measure
Remedy fault at appliance concerned.
Measure
Replace pump module.
Measure
Check KM-BUS connection to pump module.
■
Check connections in pump module.
■
Replace pump module if necessary.
■
39
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