York HIDS006B21S Service Manual page 45

Event
Power Failure or No Power Supply
Blown Fuse for
Power Supply
or Activation of
Breaker
(Outdoor Unit and
Change-Over Box)
Blown Fuse
on PCB
(Outdoor Unit)
Incorrect Power Supply Circuit of O.U. PCB
Disconnected
Wires,
Contact Failure or
Incorrect
Connection
PCB Failure
(Outdoor Unit,
Indoor Unit)
Incorrect Wiring
SM-18001-rev.1
Cause
Short Circuit between Wires
Short Circuit to Ground
Faulty Comp. Motor
Faulty Outdoor Unit
Fan Motor
Short Circuit between Wires
Short Circuit to Ground
Faulty Solenoid Coil for
Magnetic Switch (CMC)
for Comp. Motor
Faulty Outdoor Unit
Fan Motor
Between Outdoor Unit
and Indoor Unit
Power Supply Wiring
for Outdoor Unit
Disconnected Wires to
I.U./O.U. PCB
Faulty I.U./O.U.PCB
Disconnected Wire
Contact Failure
Incorrect Wiring
Check Item
Measure voltage with
tester.
Check for breakage
of insulation.
Measure insulation
resistance.
Measure resistance
between wires and
insulation resistance.
Measure resistance
between wires and
insulation resistance.
Check for breakage
of wire insulation.
Measure insulation
resistance.
Measure resistance
of coil.
Measure resistance
between wires and
insulation resistance.
Measure O.U. PCB
output.
2
Check continuity of
wires.
Check for looseness
of connection screws.
Check terminal Nos.
Check connection.
Check continuity
and looseness of
connection screws.
Check terminal Nos.
O.U. PCB: Outdoor Unit PCB
I.U. PCB:
TROUBLESHOOTING
Action
(Turn OFF Main Switch)
Supply power.
Remove cause of
short circuit.
Replace fuse and/or
I.U./O.U. PCB if faulty.
Remove cause of
short circuit to ground.
Replace fuse and/or
I.U./O.U. PCB if faulty.
Replace comp. and
fuse. (O.U.) Replace
inverter PCB and/or
PCB if faulty. (O.U.)
Replace outdoor unit
fan motor and fuse.
Replace O.U. PCB
if faulty.
Remove cause of
short circuit and
replace fuse.
Remove cause of
short circuit and
replace fuse.
Replace magnetic
switch (CMC) and fuse.
Replace fan motor
and fuse.
Replace O.U. PCB.
Replace and repair
wires, tighten screws
or correct wires.
Correctly connect wires.
Correctly connect wires.
Replace it if faulty.
Replace or repair
wires, or tighten screws.
Correctly connect wires.
Indoor Unit PCB
3-23