Mitsubishi Electric CMB-PW202V-J, Service Handbook, Page: 56 / 114

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VI
Control ]
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HWE09070 GB
(2) Outdoor unit (cooling only, heating only, cooling main and heating main modes)
Start
Breaker
turned on
Operation
command
Error stop
Error display on
the outdoor unit LED
Self-holding of
protection function
Operation command
to the WCB
Operation
mode
Error mode
52C1 ON
*Note 1
*Note 2
*Note 3
*Note 4
YES
YES
YES
YES
NO
NO
NO
fan
NO
"HO" / "PLEASE WAIT" blinks
on the remote controller
Operation command to the WCB
Cooling only, Heating only
Mixture of units in cooling and heating
Mixture of units in cooling and heating
Protection function
self-holding cancelled.
Normal operation
1. 52C1 4-way valve OFF
2. Inverter output 0Hz
3. Fan stop
4. All solenoid valves OFF
Cooling Only Heating Only
2
2
Cooling Main
Operation
mode
Operation
mode
*Note 1. For about three minutes after power on, a search for the outdoor unit address, WCB address, indoor unit
address, remote controller address, and group information will start. During the search,
"HO"/ "PLEASE WAIT" blinks on the display of the remote controller. When the indoor unit to be controlled
by the remote controller is missing, "HO"/ "PLEASE WAIT" keeps blinking on the display of the remote
controller, even after three or more minutes have passed after power on.
*Note 3. The units will follow the operation mode commands from WCB.
*Note 4. When the operation mode commands from WCB are mixed (both cooling and heating), the actual operation mode
(Cooling-main or Heating-main) is determined by the outdoor unit.
*Note 2. The system may go into the error mode on the indoor unit, WCB, or outdoor unit side. The outdoor units will stop
only when all of the connected indoor units are experiencing a problem. If at least one of the indoor units is in
normal operation, the outdoor unit will continue in operation, displaying an error code on the LED.
Heating Main
Indoor units
registered to the
remote controller
Error
Unit in the stopped state