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Mitsubishi Electric PUHZ-W85VHA Service Manual Page 13

Air to water heat pump.
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Abnormal point and detection method
Error Code
Miswiring of Interface unit/Flow temp.
controller-outdoor unit connecting wire
1. Outdoor controller circuit board can
automatically check the number of
connected Interface unit/Flow temp. con-
troller. Abnormal if the number cannot be
checked automatically due to miswiring
of Interface unit/Flow temp. controller-
outdoor unit connecting wire and etc.
after power is turned on for 4 minutes.
2. Abnormal if outdoor controller circuit
board recognizes excessive number of
Interface unit/Flow temp. controller.
EA
Miswiring of Interface unit/Flow temp.
controller-outdoor unit connecting wire
(converse wiring or disconnection)
Outdoor controller circuit board can
automatically set the unit number of
Interface unit/Flow temp. controller.
Abnormal if the Interface unit/Flow temp.
controller number cannot be set within 4
Eb
minutes after power on because of miswir-
ing (converse wiring or disconnection) of
Interface unit/Flow temp. controller-outdoor
unit connecting wire.
Start-up time over
The unit cannot finish start-up process
within 4 minutes after power on.
EC
Case
Contact failure or miswiring of
Interface unit/Flow temp. controller-
outdoor unit connecting wire
Diameter or length of Interface
unit/Flow temp. controller-out-
door unit connecting wire is out
of specified capacity.
Excessive number of Interface
unit/Flow temp. controller is
connected to 1 outdoor unit.
(2 units or more)
Defective transmitting receiving
circuit of outdoor controller
circuit board
Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
Noise has entered into power
supply or Interface/Flow temp.
controller-outdoor unit connect-
ing wire.
Contact failure or miswiring of
Interface unit/Flow temp. control-
ler-outdoor unit connecting wire
Diameter or length of Interface
unit/Flow temp. controller-out-
door unit connecting wire is out
of specified capacity.
Defective transmitting receiving circuit
of outdoor controller circuit board
Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
Noise has entered into power supply
or Interface unit/Flow temp. control-
ler-outdoor unit connecting wire.
Contact failure of Interface unit
/Flow temp. controller-outdoor
unit connecting wire
Diameter or length of Interface
unit/Flow temp. controller-
outdoor unit connecting wire is
out of specified capacity.
Noise has entered into power sup-
ply or Interface unit/Flow temp.
controller-outdoor unit connecting
wire.
13
Judgment and action
Check disconnection or looseness or polarity
of Interface unit/Flow temp. controller-outdoor
unit connecting wire of Interface unit/Flow
temp. controller and outdoor units.
Check diameter and length of Interface unit/
Flow temp. controller-outdoor unit connecting
wire.
Total wiring length: 80 m
(Including wiring connecting each Interface
unit/Flow temp. controller unit and between
Interface unit/Flow temp. controller and out-
door unit)
Also check if the connection order of flat
cable is S1, S2, S3.
Check the number of Interface unit/Flow
temp. controller that is connected to 1 out-
door unit. (If EA is detected.)
~
Turn the power off once, and on again to
check.
Replace outdoor controller circuit board or
Interface/Flow temp. controller board
if abnormality occurs again.
Check transmission path, and remove the
cause.
The descriptions above,
- , are for EA, Eb
and EC.

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