F51
'' PT1000 SOLAR
SENSOR
FAULT
''
Ensure that P00
=1
for HM
model.
(P00: 2,4 is used for
HST model).
NO
PT1000 sensor cables may
be
not mounted, or there may
be
a loose contact.
Check the cables
YES
Fix them if not
mounted, replace
them if there is any
damage.
Check whether any problem
on PT1000 sensor.
(Resistance
Check)
YES
Replace sensor in
case of any problem.
Replace
main
board.
NO
YES
F52
'' DHW
TEMPERATURE
SENSOR
FAULT
''
NO
DHW temperature sensor
cables may
be
not mounted, or there
may be a loose contact.
Check the cables
Fix them if not
mounted, replace
them if there is any
damage.
Check whether any problem
on
DHW
water temperature
sensor.
(Resistance
Check)
Replace sensor in case
of any problem.
Replace
main
board.
NO
YES
YES
40
