Panasonic KY-B84BXBXD, Service Manual

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H21
Breakdown detection for the power
relay.
"H21" appears when the main
power switch is turned on. 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.
Ensure the connection.
If connection is proper and the wire
is not damaged. Replace P.C.board A of the heater
where "H21" is displayed.
H23
Breakdown detection for the 0W
relay.
"H23" appears when the main
power switch is turned on. 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
Ensure that connection is proper.
If connection is proper and the wire
is not damaged. Replace P.C.board A of the heater
where "H23" is displayed.
If the error persists after replacing
P.C.board A. Replace P.C.board B of the heater
where "H23" is displayed.
H53
Breakdown detection for the cooling
fan
"H53" appears when the Heat
switch is turned on. Fan motor is not turning. Ensure the connection.
Replace the fan motor of the heater
where "H53" is displayed.
If the fan motor is functional. Replace the P.C.board B of the
heater where "H53" is displayed.
If the P.C.board B is functional. Replace the P.C.board A of the
heater where "H53" is displayed.
H56
Breakdown detection for the IR sen-
sor
"H56" appears when the Power
switch or the Heat switch is turned
on. Ensure the connection of the IR
sensor. Ensure the connection.
Replace the front IH coil of the
heater where "H56" is displayed.
If the front IH coil is functional. Replace the P.C.board A of the
heater where "H56" is displayed.
H71
Open circuit detection for the IH
coil-center thermistor
(Left and Right rear IH heater)
"H71" appears when the main
power switch is turned on. Check if the connectors are prop-
erly set.
*E.g.
CN9 on P.C.board A
Ensure the connection.
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.
Confirm the wire is not damaged
and replace thermistor B.
If thermistor B is functional. Replace P.C.board A of the heater
where "H71" is displayed.
H72
Open circuit detection for the therm-
istor between IH coils
(Left and Right rear IH heater)
"H72" appears when the main
power switch is turned on. Check if the connectors are prop-
erly set.
*E.g.
CN9 on P.C.board A.
Ensure the connection.
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.
Replace the rear IH coil of the
heater where "H72" is displayed.
If the rear IH-coil is functional and
the wire is not damaged. Replace P.C.board A of the heater
where "H72" is displayed.
Error Codes
Description
Symptom/State Checkpoint Remedy/Repair