Operating instructions

51
Message
System characteristics Cause Measures
39 Return sensor primary
Operation with tempera-
ture value of flow temper-
ature sensor in primary
circuit, minus 2 K. If both
temperature sensors
(primary flow and return)
are faulty, the heat pump
stops (message A9)
Lead break, primary
return temperature sen-
sor (brine outlet)
Check resistance (Pt 500)
at plug-in connection F3
and terminals X5.4/X5.5;
replace sensor if
required.
40 Flow sensor HC2
Mixer heating circuit M2
is closed
Short circuit, flow tem-
perature sensor in heat-
ing circuit with mixer M2
Check resistance (Ni 500)
at extension kit connec-
tions for heating circuit
with mixer; replace sensor
if required.
43 Flow sensor system
Short circuit, system flow
temperature sensor
(downstream of heating
water buffer cylinder)
Check resistance (Pt 500)
at plug-in connection F13;
replace sensor if
required.
44 Flow sensor cooling
Short circuit, flow tem-
perature sensor, cooling
circuit
Check resistance (Ni 500)
at plug-in connection F14;
replace sensor if
required.
48 Flow sensor HC2
Mixer heating circuit M2
is closed
Lead break, flow temper-
ature sensor in heating
circuit with mixer M2
Check resistance (Ni 500)
at extension kit connec-
tions for heating circuit
with mixer; replace sensor
if required.
4B Flow sensor system
Break, system flow tem-
perature sensor (down-
stream of heating water
buffer cylinder)
Check resistance (Pt 500)
at plug-in connection F13;
replace sensor if
required.
Troubleshooting
Messages
(cont.)
5441 603 GB
Service