Daikin FTKS50BVMB, Service Manual

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Troubleshooting for Outdoor Unit SiEN18-622
374 Troubleshooting
7.13 Malfunction of Thermistor (R7T) for Outdoor Unit Liquid
Pipe
Remote Control
Display
J7
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the liquid pipe thermistor.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the heat exchange thermistor is detected.
Supposed
Causes „
Defect of thermistor (R7T) for outdoor unit liquid pipe
„ Defect of outdoor unit PCB (A1P)
Troubleshooting
∗
Refer to thermistor resistance / temperature characteristics table on P407.
(V 3 074)
Caution
NO
NO
Repl a ce the thermi s tor (R7T).
YE S
YE S
Connector
i s connected to o u tdoor
u nit PC b o a rd
(A1P).
Repl a ce o u tdoor u nit PC b o a rd
(A1P).
Connect the thermi s tor a nd t u rn
on a g a in.
Be su re to t u rn off power s witch b efore connect or di s connect connector,
or p a rt s d a m a ge m a y b e occ u rred.
Re s i s t a nce
i s norm a l when
me asu red a fter
di s connecting the thermi s tor
(R7T) from the o u tdoor
u nit PC b o a rd.
( 3 .5k ƙ ~
3 60k ƙ
)