Australian demand response model A1 series corresponds to DRED (Demand response enabling device) by
AS/NZS 4755.3.1.
DRM1 are executed as follows, upon directions from the power company.
Be sure to confirm they are not operated before usually troubleshooting.
Air conditioner demand response
9-1-2. Troubleshooting Procedure for DRED models
When a symptom such as the following table is found without a check code displayed on the remote controller,
there is a possibility that a demand operation or demand P.C. board is failed, therefore diagnose it according
to the following diagram.
Demand response mode
Description
DRM1
Compressor off
e
l
b
a
li
a
v
a
t
o
N
2
M
R
D
DRM3
Not available
Each condition is within the operating condition,
but the compressor does not work.
Operating conditions of air conditioner
Diagnosis when compressor does not work
Disconnect the
connecting wiring
of DRED.
Remove wiring of
CN106 on DRED
P.C. board.
Normal
(Demand operation)
or DRED is failed.
Inverter Assembly
is failed *1
Compressor works.
NO
YES
YES
YES
Demand
P.C. board is failed.
Refer to next page
NO
NO
Compressor works.
Indoor thermostat
is off.
Exchange of
Demand P.C. board
NO
Indoor unit
satisfies ON conditions
of the compressor.
LED of the demand
P.C. board is on.
YES
When a failure with *1 appears,
advance the diagnosis further according
to the basic service manual.
9-1-1. Before Troubleshooting
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AMP Air Conditioning
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