136
Fault mes-
sage
Cause Remedy Re-
set-
ting
"396: Eng
head t'c'
cont integ"
Deviation in actual thermo-
couple values.
Check spring length; adjust if
necessary (see page 77).
Check plug-in connection
X205 and thermocouple con-
necting cables.
Check the temperature dif-
ferential at the Stirling head
thermocouples in steady-
state condition (code 7764
and 7764 in input/output
test). If the differential
> ± 50 K, reposition the ther-
mocouples (remove yellow
connection plug and plug in C
to L or L to C). Then check
electrical output (code 8200
in diagnostics engine). If the
electrical output is too low,
replace the thermocouples.
AR (5
s)
"397: Eng
head t'c'
cont rise"
AR
(
20 min
)
"398: Eng
head t'c' lim
integ"
AR (5
s)
"399: Eng
head t'c' lim
rise"
AR
(
20 min
)
"400: Flow
dir heat
gen"
Captured return temperature
(code 8314) higher than flow
temperature (code 8310).
Check sensor leads.
Check control unit PCB and
replace if necessary (see
page 138).
"421: Temp
diff h'ex eng
bu"
Captured return temperature
(code 8314) higher than flow
temperature (code 8310).
Check whether there is a
min. flow rate of 240 l/h (code
8366 in diagnostics heat gen-
eration).
Check plug-in connection
X205 and thermocouple con-
necting cables. Check ther-
mocouples, replace if neces-
sary (see page 149).
Check cable harness.
Check function of the circula-
tion pump.
If the fault has not been rec-
tified, replace the PCB (see
page 138).
AR
Troubleshooting
Fault messages
(cont.)
5618 294 GB
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