Panasonic KY-B84BXBXD Service Manual page 38

Error Codes
Description
H21
Breakdown detection for the power
relay.
H23
Breakdown detection for the 0W
relay.
H53
Breakdown detection for the cooling
fan
H56
Breakdown detection for the IR sen-
sor
H71
Open circuit detection for the IH
coil-center thermistor
(Left and Right rear IH heater)
H72
Open circuit detection for the therm-
istor between IH coils
(Left and Right rear IH heater)
Symptom/State
"H21" appears when the
power switch is turned on.
"H23" appears when the
power switch is turned on.
"H53" appears when the Heat
switch is turned on.
"H56" appears when the Power
switch or the Heat switch is turned
on.
"H71" appears when the main
power switch is turned on.
"H72" appears when the main
power switch is turned on.
Checkpoint
main Check the wire connections of the
P.C.board A and P.C.board B.
*E.g.
CN2 on P.C.board A.
CN503 on P.C.board B.
If connection is proper and the wire
is not damaged.
main Check the wire connections of the
P.C.Board A and P.C.Board B.
*E.g.
CN11 on P.C.board A
CN501 on P.C.board B
If connection is proper and the wire
is not damaged.
If the error persists after replacing
P.C.board A.
Fan motor is not turning.
If the fan motor is functional.
If the P.C.board B is functional.
Ensure the connection of the IR
sensor.
If the front IH coil is functional.
Check if the connectors are prop-
erly set.
*E.g.
CN9 on P.C.board A
Measure the resistance between
the two terminal pins of thermistor
B's connector.
* When the resistance is higher
than 2M, it is detected out as
open.
If thermistor B is functional.
Check if the connectors are prop-
erly set.
*E.g.
CN9 on P.C.board A.
Measure the resistance between
the two terminal pins of thermistor
D's connector.
* When the resistance is higher
than 2M, it is detected out as
open.
If the rear IH-coil is functional and
the wire is not damaged.
38
Remedy/Repair
Ensure the connection.
Replace P.C.board A of the heater
where "H21" is displayed.
Ensure that connection is proper.
Replace P.C.board A of the heater
where "H23" is displayed.
Replace P.C.board B of the heater
where "H23" is displayed.
Ensure the connection.
Replace the fan motor of the heater
where "H53" is displayed.
Replace the P.C.board B of the
heater where "H53" is displayed.
Replace the P.C.board A of the
heater where "H53" is displayed.
Ensure the connection.
Replace the front IH coil of the
heater where "H56" is displayed.
Replace the P.C.board A of the
heater where "H56" is displayed.
Ensure the connection.
Confirm the wire is not damaged
and replace thermistor B.
Replace P.C.board A of the heater
where "H71" is displayed.
Ensure the connection.
Replace the rear IH coil of the
heater where "H72" is displayed.
Replace P.C.board A of the heater
where "H72" is displayed.